diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogsClient.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogsClient.java
new file mode 100644
index 000000000..e9217d5b3
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogsClient.java
@@ -0,0 +1,494 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3;
+
+import com.google.api.core.ApiFuture;
+import com.google.api.core.ApiFutures;
+import com.google.api.core.BetaApi;
+import com.google.api.gax.core.BackgroundResource;
+import com.google.api.gax.paging.AbstractFixedSizeCollection;
+import com.google.api.gax.paging.AbstractPage;
+import com.google.api.gax.paging.AbstractPagedListResponse;
+import com.google.api.gax.rpc.PageContext;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.dialogflow.cx.v3.stub.ChangelogsStub;
+import com.google.cloud.dialogflow.cx.v3.stub.ChangelogsStubSettings;
+import com.google.common.util.concurrent.MoreExecutors;
+import java.io.IOException;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Service Description: Service for managing [Changelogs][google.cloud.dialogflow.cx.v3.Changelog].
+ *
+ * <p>This class provides the ability to make remote calls to the backing service through method
+ * calls that map to API methods. Sample code to get started:
+ *
+ * <pre>{@code
+ * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+ *   ChangelogName name = ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]");
+ *   Changelog response = changelogsClient.getChangelog(name);
+ * }
+ * }</pre>
+ *
+ * <p>Note: close() needs to be called on the ChangelogsClient object to clean up resources such as
+ * threads. In the example above, try-with-resources is used, which automatically calls close().
+ *
+ * <p>The surface of this class includes several types of Java methods for each of the API's
+ * methods:
+ *
+ * <ol>
+ *   <li>A "flattened" method. With this type of method, the fields of the request type have been
+ *       converted into function parameters. It may be the case that not all fields are available as
+ *       parameters, and not every API method will have a flattened method entry point.
+ *   <li>A "request object" method. This type of method only takes one parameter, a request object,
+ *       which must be constructed before the call. Not every API method will have a request object
+ *       method.
+ *   <li>A "callable" method. This type of method takes no parameters and returns an immutable API
+ *       callable object, which can be used to initiate calls to the service.
+ * </ol>
+ *
+ * <p>See the individual methods for example code.
+ *
+ * <p>Many parameters require resource names to be formatted in a particular way. To assist with
+ * these names, this class includes a format method for each type of name, and additionally a parse
+ * method to extract the individual identifiers contained within names that are returned.
+ *
+ * <p>This class can be customized by passing in a custom instance of ChangelogsSettings to
+ * create(). For example:
+ *
+ * <p>To customize credentials:
+ *
+ * <pre>{@code
+ * ChangelogsSettings changelogsSettings =
+ *     ChangelogsSettings.newBuilder()
+ *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
+ *         .build();
+ * ChangelogsClient changelogsClient = ChangelogsClient.create(changelogsSettings);
+ * }</pre>
+ *
+ * <p>To customize the endpoint:
+ *
+ * <pre>{@code
+ * ChangelogsSettings changelogsSettings =
+ *     ChangelogsSettings.newBuilder().setEndpoint(myEndpoint).build();
+ * ChangelogsClient changelogsClient = ChangelogsClient.create(changelogsSettings);
+ * }</pre>
+ *
+ * <p>Please refer to the GitHub repository's samples for more quickstart code snippets.
+ */
+@Generated("by gapic-generator-java")
+public class ChangelogsClient implements BackgroundResource {
+  private final ChangelogsSettings settings;
+  private final ChangelogsStub stub;
+
+  /** Constructs an instance of ChangelogsClient with default settings. */
+  public static final ChangelogsClient create() throws IOException {
+    return create(ChangelogsSettings.newBuilder().build());
+  }
+
+  /**
+   * Constructs an instance of ChangelogsClient, using the given settings. The channels are created
+   * based on the settings passed in, or defaults for any settings that are not set.
+   */
+  public static final ChangelogsClient create(ChangelogsSettings settings) throws IOException {
+    return new ChangelogsClient(settings);
+  }
+
+  /**
+   * Constructs an instance of ChangelogsClient, using the given stub for making calls. This is for
+   * advanced usage - prefer using create(ChangelogsSettings).
+   */
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  public static final ChangelogsClient create(ChangelogsStub stub) {
+    return new ChangelogsClient(stub);
+  }
+
+  /**
+   * Constructs an instance of ChangelogsClient, using the given settings. This is protected so that
+   * it is easy to make a subclass, but otherwise, the static factory methods should be preferred.
+   */
+  protected ChangelogsClient(ChangelogsSettings settings) throws IOException {
+    this.settings = settings;
+    this.stub = ((ChangelogsStubSettings) settings.getStubSettings()).createStub();
+  }
+
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  protected ChangelogsClient(ChangelogsStub stub) {
+    this.settings = null;
+    this.stub = stub;
+  }
+
+  public final ChangelogsSettings getSettings() {
+    return settings;
+  }
+
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  public ChangelogsStub getStub() {
+    return stub;
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Returns the list of Changelogs.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   AgentName parent = AgentName.of("[PROJECT]", "[LOCATION]", "[AGENT]");
+   *   for (Changelog element : changelogsClient.listChangelogs(parent).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
+   * }
+   * }</pre>
+   *
+   * @param parent Required. The agent containing the changelogs. Format: `projects/&lt;Project
+   *     ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final ListChangelogsPagedResponse listChangelogs(AgentName parent) {
+    ListChangelogsRequest request =
+        ListChangelogsRequest.newBuilder()
+            .setParent(parent == null ? null : parent.toString())
+            .build();
+    return listChangelogs(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Returns the list of Changelogs.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   String parent =
+   *       ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString();
+   *   for (Changelog element : changelogsClient.listChangelogs(parent).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
+   * }
+   * }</pre>
+   *
+   * @param parent Required. The agent containing the changelogs. Format: `projects/&lt;Project
+   *     ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final ListChangelogsPagedResponse listChangelogs(String parent) {
+    ListChangelogsRequest request = ListChangelogsRequest.newBuilder().setParent(parent).build();
+    return listChangelogs(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Returns the list of Changelogs.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   ListChangelogsRequest request =
+   *       ListChangelogsRequest.newBuilder()
+   *           .setParent(
+   *               ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+   *           .setFilter("filter-1274492040")
+   *           .setPageSize(883849137)
+   *           .setPageToken("pageToken873572522")
+   *           .build();
+   *   for (Changelog element : changelogsClient.listChangelogs(request).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
+   * }
+   * }</pre>
+   *
+   * @param request The request object containing all of the parameters for the API call.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final ListChangelogsPagedResponse listChangelogs(ListChangelogsRequest request) {
+    return listChangelogsPagedCallable().call(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Returns the list of Changelogs.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   ListChangelogsRequest request =
+   *       ListChangelogsRequest.newBuilder()
+   *           .setParent(
+   *               ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+   *           .setFilter("filter-1274492040")
+   *           .setPageSize(883849137)
+   *           .setPageToken("pageToken873572522")
+   *           .build();
+   *   ApiFuture<Changelog> future =
+   *       changelogsClient.listChangelogsPagedCallable().futureCall(request);
+   *   // Do something.
+   *   for (Changelog element : future.get().iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
+   * }
+   * }</pre>
+   */
+  public final UnaryCallable<ListChangelogsRequest, ListChangelogsPagedResponse>
+      listChangelogsPagedCallable() {
+    return stub.listChangelogsPagedCallable();
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Returns the list of Changelogs.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   ListChangelogsRequest request =
+   *       ListChangelogsRequest.newBuilder()
+   *           .setParent(
+   *               ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+   *           .setFilter("filter-1274492040")
+   *           .setPageSize(883849137)
+   *           .setPageToken("pageToken873572522")
+   *           .build();
+   *   while (true) {
+   *     ListChangelogsResponse response = changelogsClient.listChangelogsCallable().call(request);
+   *     for (Changelog element : response.getResponsesList()) {
+   *       // doThingsWith(element);
+   *     }
+   *     String nextPageToken = response.getNextPageToken();
+   *     if (!Strings.isNullOrEmpty(nextPageToken)) {
+   *       request = request.toBuilder().setPageToken(nextPageToken).build();
+   *     } else {
+   *       break;
+   *     }
+   *   }
+   * }
+   * }</pre>
+   */
+  public final UnaryCallable<ListChangelogsRequest, ListChangelogsResponse>
+      listChangelogsCallable() {
+    return stub.listChangelogsCallable();
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Retrieves the specified Changelog.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   ChangelogName name = ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]");
+   *   Changelog response = changelogsClient.getChangelog(name);
+   * }
+   * }</pre>
+   *
+   * @param name Required. The name of the changelog to get. Format: `projects/&lt;Project
+   *     ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;/changelogs/&lt;Changelog
+   *     ID&gt;`.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final Changelog getChangelog(ChangelogName name) {
+    GetChangelogRequest request =
+        GetChangelogRequest.newBuilder().setName(name == null ? null : name.toString()).build();
+    return getChangelog(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Retrieves the specified Changelog.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   String name =
+   *       ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString();
+   *   Changelog response = changelogsClient.getChangelog(name);
+   * }
+   * }</pre>
+   *
+   * @param name Required. The name of the changelog to get. Format: `projects/&lt;Project
+   *     ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;/changelogs/&lt;Changelog
+   *     ID&gt;`.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final Changelog getChangelog(String name) {
+    GetChangelogRequest request = GetChangelogRequest.newBuilder().setName(name).build();
+    return getChangelog(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Retrieves the specified Changelog.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   GetChangelogRequest request =
+   *       GetChangelogRequest.newBuilder()
+   *           .setName(
+   *               ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+   *           .build();
+   *   Changelog response = changelogsClient.getChangelog(request);
+   * }
+   * }</pre>
+   *
+   * @param request The request object containing all of the parameters for the API call.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final Changelog getChangelog(GetChangelogRequest request) {
+    return getChangelogCallable().call(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Retrieves the specified Changelog.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   GetChangelogRequest request =
+   *       GetChangelogRequest.newBuilder()
+   *           .setName(
+   *               ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+   *           .build();
+   *   ApiFuture<Changelog> future = changelogsClient.getChangelogCallable().futureCall(request);
+   *   // Do something.
+   *   Changelog response = future.get();
+   * }
+   * }</pre>
+   */
+  public final UnaryCallable<GetChangelogRequest, Changelog> getChangelogCallable() {
+    return stub.getChangelogCallable();
+  }
+
+  @Override
+  public final void close() {
+    stub.close();
+  }
+
+  @Override
+  public void shutdown() {
+    stub.shutdown();
+  }
+
+  @Override
+  public boolean isShutdown() {
+    return stub.isShutdown();
+  }
+
+  @Override
+  public boolean isTerminated() {
+    return stub.isTerminated();
+  }
+
+  @Override
+  public void shutdownNow() {
+    stub.shutdownNow();
+  }
+
+  @Override
+  public boolean awaitTermination(long duration, TimeUnit unit) throws InterruptedException {
+    return stub.awaitTermination(duration, unit);
+  }
+
+  public static class ListChangelogsPagedResponse
+      extends AbstractPagedListResponse<
+          ListChangelogsRequest,
+          ListChangelogsResponse,
+          Changelog,
+          ListChangelogsPage,
+          ListChangelogsFixedSizeCollection> {
+
+    public static ApiFuture<ListChangelogsPagedResponse> createAsync(
+        PageContext<ListChangelogsRequest, ListChangelogsResponse, Changelog> context,
+        ApiFuture<ListChangelogsResponse> futureResponse) {
+      ApiFuture<ListChangelogsPage> futurePage =
+          ListChangelogsPage.createEmptyPage().createPageAsync(context, futureResponse);
+      return ApiFutures.transform(
+          futurePage,
+          input -> new ListChangelogsPagedResponse(input),
+          MoreExecutors.directExecutor());
+    }
+
+    private ListChangelogsPagedResponse(ListChangelogsPage page) {
+      super(page, ListChangelogsFixedSizeCollection.createEmptyCollection());
+    }
+  }
+
+  public static class ListChangelogsPage
+      extends AbstractPage<
+          ListChangelogsRequest, ListChangelogsResponse, Changelog, ListChangelogsPage> {
+
+    private ListChangelogsPage(
+        PageContext<ListChangelogsRequest, ListChangelogsResponse, Changelog> context,
+        ListChangelogsResponse response) {
+      super(context, response);
+    }
+
+    private static ListChangelogsPage createEmptyPage() {
+      return new ListChangelogsPage(null, null);
+    }
+
+    @Override
+    protected ListChangelogsPage createPage(
+        PageContext<ListChangelogsRequest, ListChangelogsResponse, Changelog> context,
+        ListChangelogsResponse response) {
+      return new ListChangelogsPage(context, response);
+    }
+
+    @Override
+    public ApiFuture<ListChangelogsPage> createPageAsync(
+        PageContext<ListChangelogsRequest, ListChangelogsResponse, Changelog> context,
+        ApiFuture<ListChangelogsResponse> futureResponse) {
+      return super.createPageAsync(context, futureResponse);
+    }
+  }
+
+  public static class ListChangelogsFixedSizeCollection
+      extends AbstractFixedSizeCollection<
+          ListChangelogsRequest,
+          ListChangelogsResponse,
+          Changelog,
+          ListChangelogsPage,
+          ListChangelogsFixedSizeCollection> {
+
+    private ListChangelogsFixedSizeCollection(List<ListChangelogsPage> pages, int collectionSize) {
+      super(pages, collectionSize);
+    }
+
+    private static ListChangelogsFixedSizeCollection createEmptyCollection() {
+      return new ListChangelogsFixedSizeCollection(null, 0);
+    }
+
+    @Override
+    protected ListChangelogsFixedSizeCollection createCollection(
+        List<ListChangelogsPage> pages, int collectionSize) {
+      return new ListChangelogsFixedSizeCollection(pages, collectionSize);
+    }
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogsSettings.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogsSettings.java
new file mode 100644
index 000000000..33bd0f8c0
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogsSettings.java
@@ -0,0 +1,196 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3;
+
+import static com.google.cloud.dialogflow.cx.v3.ChangelogsClient.ListChangelogsPagedResponse;
+
+import com.google.api.core.ApiFunction;
+import com.google.api.core.BetaApi;
+import com.google.api.gax.core.GoogleCredentialsProvider;
+import com.google.api.gax.core.InstantiatingExecutorProvider;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.ClientSettings;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.TransportChannelProvider;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.cloud.dialogflow.cx.v3.stub.ChangelogsStubSettings;
+import java.io.IOException;
+import java.util.List;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Settings class to configure an instance of {@link ChangelogsClient}.
+ *
+ * <p>The default instance has everything set to sensible defaults:
+ *
+ * <ul>
+ *   <li>The default service address (dialogflow.googleapis.com) and default port (443) are used.
+ *   <li>Credentials are acquired automatically through Application Default Credentials.
+ *   <li>Retries are configured for idempotent methods but not for non-idempotent methods.
+ * </ul>
+ *
+ * <p>The builder of this class is recursive, so contained classes are themselves builders. When
+ * build() is called, the tree of builders is called to create the complete settings object.
+ *
+ * <p>For example, to set the total timeout of getChangelog to 30 seconds:
+ *
+ * <pre>{@code
+ * ChangelogsSettings.Builder changelogsSettingsBuilder = ChangelogsSettings.newBuilder();
+ * changelogsSettingsBuilder
+ *     .getChangelogSettings()
+ *     .setRetrySettings(
+ *         changelogsSettingsBuilder
+ *             .getChangelogSettings()
+ *             .getRetrySettings()
+ *             .toBuilder()
+ *             .setTotalTimeout(Duration.ofSeconds(30))
+ *             .build());
+ * ChangelogsSettings changelogsSettings = changelogsSettingsBuilder.build();
+ * }</pre>
+ */
+@Generated("by gapic-generator-java")
+public class ChangelogsSettings extends ClientSettings<ChangelogsSettings> {
+
+  /** Returns the object with the settings used for calls to listChangelogs. */
+  public PagedCallSettings<
+          ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+      listChangelogsSettings() {
+    return ((ChangelogsStubSettings) getStubSettings()).listChangelogsSettings();
+  }
+
+  /** Returns the object with the settings used for calls to getChangelog. */
+  public UnaryCallSettings<GetChangelogRequest, Changelog> getChangelogSettings() {
+    return ((ChangelogsStubSettings) getStubSettings()).getChangelogSettings();
+  }
+
+  public static final ChangelogsSettings create(ChangelogsStubSettings stub) throws IOException {
+    return new ChangelogsSettings.Builder(stub.toBuilder()).build();
+  }
+
+  /** Returns a builder for the default ExecutorProvider for this service. */
+  public static InstantiatingExecutorProvider.Builder defaultExecutorProviderBuilder() {
+    return ChangelogsStubSettings.defaultExecutorProviderBuilder();
+  }
+
+  /** Returns the default service endpoint. */
+  public static String getDefaultEndpoint() {
+    return ChangelogsStubSettings.getDefaultEndpoint();
+  }
+
+  /** Returns the default service scopes. */
+  public static List<String> getDefaultServiceScopes() {
+    return ChangelogsStubSettings.getDefaultServiceScopes();
+  }
+
+  /** Returns a builder for the default credentials for this service. */
+  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
+    return ChangelogsStubSettings.defaultCredentialsProviderBuilder();
+  }
+
+  /** Returns a builder for the default ChannelProvider for this service. */
+  public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
+    return ChangelogsStubSettings.defaultGrpcTransportProviderBuilder();
+  }
+
+  public static TransportChannelProvider defaultTransportChannelProvider() {
+    return ChangelogsStubSettings.defaultTransportChannelProvider();
+  }
+
+  @BetaApi("The surface for customizing headers is not stable yet and may change in the future.")
+  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+    return ChangelogsStubSettings.defaultApiClientHeaderProviderBuilder();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder() {
+    return Builder.createDefault();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder(ClientContext clientContext) {
+    return new Builder(clientContext);
+  }
+
+  /** Returns a builder containing all the values of this settings class. */
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  protected ChangelogsSettings(Builder settingsBuilder) throws IOException {
+    super(settingsBuilder);
+  }
+
+  /** Builder for ChangelogsSettings. */
+  public static class Builder extends ClientSettings.Builder<ChangelogsSettings, Builder> {
+
+    protected Builder() throws IOException {
+      this(((ClientContext) null));
+    }
+
+    protected Builder(ClientContext clientContext) {
+      super(ChangelogsStubSettings.newBuilder(clientContext));
+    }
+
+    protected Builder(ChangelogsSettings settings) {
+      super(settings.getStubSettings().toBuilder());
+    }
+
+    protected Builder(ChangelogsStubSettings.Builder stubSettings) {
+      super(stubSettings);
+    }
+
+    private static Builder createDefault() {
+      return new Builder(ChangelogsStubSettings.newBuilder());
+    }
+
+    public ChangelogsStubSettings.Builder getStubSettingsBuilder() {
+      return ((ChangelogsStubSettings.Builder) getStubSettings());
+    }
+
+    /**
+     * Applies the given settings updater function to all of the unary API methods in this service.
+     *
+     * <p>Note: This method does not support applying settings to streaming methods.
+     */
+    public Builder applyToAllUnaryMethods(
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) {
+      super.applyToAllUnaryMethods(
+          getStubSettingsBuilder().unaryMethodSettingsBuilders(), settingsUpdater);
+      return this;
+    }
+
+    /** Returns the builder for the settings used for calls to listChangelogs. */
+    public PagedCallSettings.Builder<
+            ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+        listChangelogsSettings() {
+      return getStubSettingsBuilder().listChangelogsSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to getChangelog. */
+    public UnaryCallSettings.Builder<GetChangelogRequest, Changelog> getChangelogSettings() {
+      return getStubSettingsBuilder().getChangelogSettings();
+    }
+
+    @Override
+    public ChangelogsSettings build() throws IOException {
+      return new ChangelogsSettings(this);
+    }
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/gapic_metadata.json b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/gapic_metadata.json
index bc1f63b2a..56504fac0 100644
--- a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/gapic_metadata.json
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/gapic_metadata.json
@@ -41,6 +41,21 @@
         }
       }
     },
+    "Changelogs": {
+      "clients": {
+        "grpc": {
+          "libraryClient": "ChangelogsClient",
+          "rpcs": {
+            "GetChangelog": {
+              "methods": ["getChangelog", "getChangelog", "getChangelog", "getChangelogCallable"]
+            },
+            "ListChangelogs": {
+              "methods": ["listChangelogs", "listChangelogs", "listChangelogs", "listChangelogsPagedCallable", "listChangelogsCallable"]
+            }
+          }
+        }
+      }
+    },
     "Deployments": {
       "clients": {
         "grpc": {
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/package-info.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/package-info.java
index 09086c160..9a851728a 100644
--- a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/package-info.java
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/package-info.java
@@ -32,6 +32,20 @@
  * }
  * }</pre>
  *
+ * <p>======================= ChangelogsClient =======================
+ *
+ * <p>Service Description: Service for managing
+ * [Changelogs][google.cloud.dialogflow.cx.v3.Changelog].
+ *
+ * <p>Sample for ChangelogsClient:
+ *
+ * <pre>{@code
+ * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+ *   ChangelogName name = ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]");
+ *   Changelog response = changelogsClient.getChangelog(name);
+ * }
+ * }</pre>
+ *
  * <p>======================= DeploymentsClient =======================
  *
  * <p>Service Description: Service for managing
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/ChangelogsStub.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/ChangelogsStub.java
new file mode 100644
index 000000000..83130880e
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/ChangelogsStub.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3.stub;
+
+import static com.google.cloud.dialogflow.cx.v3.ChangelogsClient.ListChangelogsPagedResponse;
+
+import com.google.api.gax.core.BackgroundResource;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.dialogflow.cx.v3.Changelog;
+import com.google.cloud.dialogflow.cx.v3.GetChangelogRequest;
+import com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest;
+import com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Base stub class for the Changelogs service API.
+ *
+ * <p>This class is for advanced usage and reflects the underlying API directly.
+ */
+@Generated("by gapic-generator-java")
+public abstract class ChangelogsStub implements BackgroundResource {
+
+  public UnaryCallable<ListChangelogsRequest, ListChangelogsPagedResponse>
+      listChangelogsPagedCallable() {
+    throw new UnsupportedOperationException("Not implemented: listChangelogsPagedCallable()");
+  }
+
+  public UnaryCallable<ListChangelogsRequest, ListChangelogsResponse> listChangelogsCallable() {
+    throw new UnsupportedOperationException("Not implemented: listChangelogsCallable()");
+  }
+
+  public UnaryCallable<GetChangelogRequest, Changelog> getChangelogCallable() {
+    throw new UnsupportedOperationException("Not implemented: getChangelogCallable()");
+  }
+
+  @Override
+  public abstract void close();
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/ChangelogsStubSettings.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/ChangelogsStubSettings.java
new file mode 100644
index 000000000..e7dc4cb5c
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/ChangelogsStubSettings.java
@@ -0,0 +1,371 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3.stub;
+
+import static com.google.cloud.dialogflow.cx.v3.ChangelogsClient.ListChangelogsPagedResponse;
+
+import com.google.api.core.ApiFunction;
+import com.google.api.core.ApiFuture;
+import com.google.api.core.BetaApi;
+import com.google.api.gax.core.GaxProperties;
+import com.google.api.gax.core.GoogleCredentialsProvider;
+import com.google.api.gax.core.InstantiatingExecutorProvider;
+import com.google.api.gax.grpc.GaxGrpcProperties;
+import com.google.api.gax.grpc.GrpcTransportChannel;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.retrying.RetrySettings;
+import com.google.api.gax.rpc.ApiCallContext;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.PageContext;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.PagedListDescriptor;
+import com.google.api.gax.rpc.PagedListResponseFactory;
+import com.google.api.gax.rpc.StatusCode;
+import com.google.api.gax.rpc.StubSettings;
+import com.google.api.gax.rpc.TransportChannelProvider;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.dialogflow.cx.v3.Changelog;
+import com.google.cloud.dialogflow.cx.v3.GetChangelogRequest;
+import com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest;
+import com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Lists;
+import java.io.IOException;
+import java.util.List;
+import javax.annotation.Generated;
+import org.threeten.bp.Duration;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Settings class to configure an instance of {@link ChangelogsStub}.
+ *
+ * <p>The default instance has everything set to sensible defaults:
+ *
+ * <ul>
+ *   <li>The default service address (dialogflow.googleapis.com) and default port (443) are used.
+ *   <li>Credentials are acquired automatically through Application Default Credentials.
+ *   <li>Retries are configured for idempotent methods but not for non-idempotent methods.
+ * </ul>
+ *
+ * <p>The builder of this class is recursive, so contained classes are themselves builders. When
+ * build() is called, the tree of builders is called to create the complete settings object.
+ *
+ * <p>For example, to set the total timeout of getChangelog to 30 seconds:
+ *
+ * <pre>{@code
+ * ChangelogsStubSettings.Builder changelogsSettingsBuilder = ChangelogsStubSettings.newBuilder();
+ * changelogsSettingsBuilder
+ *     .getChangelogSettings()
+ *     .setRetrySettings(
+ *         changelogsSettingsBuilder
+ *             .getChangelogSettings()
+ *             .getRetrySettings()
+ *             .toBuilder()
+ *             .setTotalTimeout(Duration.ofSeconds(30))
+ *             .build());
+ * ChangelogsStubSettings changelogsSettings = changelogsSettingsBuilder.build();
+ * }</pre>
+ */
+@Generated("by gapic-generator-java")
+public class ChangelogsStubSettings extends StubSettings<ChangelogsStubSettings> {
+  /** The default scopes of the service. */
+  private static final ImmutableList<String> DEFAULT_SERVICE_SCOPES =
+      ImmutableList.<String>builder()
+          .add("https://www.googleapis.com/auth/cloud-platform")
+          .add("https://www.googleapis.com/auth/dialogflow")
+          .build();
+
+  private final PagedCallSettings<
+          ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+      listChangelogsSettings;
+  private final UnaryCallSettings<GetChangelogRequest, Changelog> getChangelogSettings;
+
+  private static final PagedListDescriptor<ListChangelogsRequest, ListChangelogsResponse, Changelog>
+      LIST_CHANGELOGS_PAGE_STR_DESC =
+          new PagedListDescriptor<ListChangelogsRequest, ListChangelogsResponse, Changelog>() {
+            @Override
+            public String emptyToken() {
+              return "";
+            }
+
+            @Override
+            public ListChangelogsRequest injectToken(ListChangelogsRequest payload, String token) {
+              return ListChangelogsRequest.newBuilder(payload).setPageToken(token).build();
+            }
+
+            @Override
+            public ListChangelogsRequest injectPageSize(
+                ListChangelogsRequest payload, int pageSize) {
+              return ListChangelogsRequest.newBuilder(payload).setPageSize(pageSize).build();
+            }
+
+            @Override
+            public Integer extractPageSize(ListChangelogsRequest payload) {
+              return payload.getPageSize();
+            }
+
+            @Override
+            public String extractNextToken(ListChangelogsResponse payload) {
+              return payload.getNextPageToken();
+            }
+
+            @Override
+            public Iterable<Changelog> extractResources(ListChangelogsResponse payload) {
+              return payload.getChangelogsList() == null
+                  ? ImmutableList.<Changelog>of()
+                  : payload.getChangelogsList();
+            }
+          };
+
+  private static final PagedListResponseFactory<
+          ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+      LIST_CHANGELOGS_PAGE_STR_FACT =
+          new PagedListResponseFactory<
+              ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>() {
+            @Override
+            public ApiFuture<ListChangelogsPagedResponse> getFuturePagedResponse(
+                UnaryCallable<ListChangelogsRequest, ListChangelogsResponse> callable,
+                ListChangelogsRequest request,
+                ApiCallContext context,
+                ApiFuture<ListChangelogsResponse> futureResponse) {
+              PageContext<ListChangelogsRequest, ListChangelogsResponse, Changelog> pageContext =
+                  PageContext.create(callable, LIST_CHANGELOGS_PAGE_STR_DESC, request, context);
+              return ListChangelogsPagedResponse.createAsync(pageContext, futureResponse);
+            }
+          };
+
+  /** Returns the object with the settings used for calls to listChangelogs. */
+  public PagedCallSettings<
+          ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+      listChangelogsSettings() {
+    return listChangelogsSettings;
+  }
+
+  /** Returns the object with the settings used for calls to getChangelog. */
+  public UnaryCallSettings<GetChangelogRequest, Changelog> getChangelogSettings() {
+    return getChangelogSettings;
+  }
+
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  public ChangelogsStub createStub() throws IOException {
+    if (getTransportChannelProvider()
+        .getTransportName()
+        .equals(GrpcTransportChannel.getGrpcTransportName())) {
+      return GrpcChangelogsStub.create(this);
+    }
+    throw new UnsupportedOperationException(
+        String.format(
+            "Transport not supported: %s", getTransportChannelProvider().getTransportName()));
+  }
+
+  /** Returns a builder for the default ExecutorProvider for this service. */
+  public static InstantiatingExecutorProvider.Builder defaultExecutorProviderBuilder() {
+    return InstantiatingExecutorProvider.newBuilder();
+  }
+
+  /** Returns the default service endpoint. */
+  public static String getDefaultEndpoint() {
+    return "dialogflow.googleapis.com:443";
+  }
+
+  /** Returns the default mTLS service endpoint. */
+  public static String getDefaultMtlsEndpoint() {
+    return "dialogflow.mtls.googleapis.com:443";
+  }
+
+  /** Returns the default service scopes. */
+  public static List<String> getDefaultServiceScopes() {
+    return DEFAULT_SERVICE_SCOPES;
+  }
+
+  /** Returns a builder for the default credentials for this service. */
+  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
+    return GoogleCredentialsProvider.newBuilder()
+        .setScopesToApply(DEFAULT_SERVICE_SCOPES)
+        .setUseJwtAccessWithScope(true);
+  }
+
+  /** Returns a builder for the default ChannelProvider for this service. */
+  public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
+    return InstantiatingGrpcChannelProvider.newBuilder()
+        .setMaxInboundMessageSize(Integer.MAX_VALUE);
+  }
+
+  public static TransportChannelProvider defaultTransportChannelProvider() {
+    return defaultGrpcTransportProviderBuilder().build();
+  }
+
+  @BetaApi("The surface for customizing headers is not stable yet and may change in the future.")
+  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+    return ApiClientHeaderProvider.newBuilder()
+        .setGeneratedLibToken(
+            "gapic", GaxProperties.getLibraryVersion(ChangelogsStubSettings.class))
+        .setTransportToken(
+            GaxGrpcProperties.getGrpcTokenName(), GaxGrpcProperties.getGrpcVersion());
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder() {
+    return Builder.createDefault();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder(ClientContext clientContext) {
+    return new Builder(clientContext);
+  }
+
+  /** Returns a builder containing all the values of this settings class. */
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  protected ChangelogsStubSettings(Builder settingsBuilder) throws IOException {
+    super(settingsBuilder);
+
+    listChangelogsSettings = settingsBuilder.listChangelogsSettings().build();
+    getChangelogSettings = settingsBuilder.getChangelogSettings().build();
+  }
+
+  /** Builder for ChangelogsStubSettings. */
+  public static class Builder extends StubSettings.Builder<ChangelogsStubSettings, Builder> {
+    private final ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders;
+    private final PagedCallSettings.Builder<
+            ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+        listChangelogsSettings;
+    private final UnaryCallSettings.Builder<GetChangelogRequest, Changelog> getChangelogSettings;
+    private static final ImmutableMap<String, ImmutableSet<StatusCode.Code>>
+        RETRYABLE_CODE_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, ImmutableSet<StatusCode.Code>> definitions =
+          ImmutableMap.builder();
+      definitions.put(
+          "retry_policy_0_codes",
+          ImmutableSet.copyOf(Lists.<StatusCode.Code>newArrayList(StatusCode.Code.UNAVAILABLE)));
+      RETRYABLE_CODE_DEFINITIONS = definitions.build();
+    }
+
+    private static final ImmutableMap<String, RetrySettings> RETRY_PARAM_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, RetrySettings> definitions = ImmutableMap.builder();
+      RetrySettings settings = null;
+      settings =
+          RetrySettings.newBuilder()
+              .setInitialRetryDelay(Duration.ofMillis(100L))
+              .setRetryDelayMultiplier(1.3)
+              .setMaxRetryDelay(Duration.ofMillis(60000L))
+              .setInitialRpcTimeout(Duration.ofMillis(60000L))
+              .setRpcTimeoutMultiplier(1.0)
+              .setMaxRpcTimeout(Duration.ofMillis(60000L))
+              .setTotalTimeout(Duration.ofMillis(60000L))
+              .build();
+      definitions.put("retry_policy_0_params", settings);
+      RETRY_PARAM_DEFINITIONS = definitions.build();
+    }
+
+    protected Builder() {
+      this(((ClientContext) null));
+    }
+
+    protected Builder(ClientContext clientContext) {
+      super(clientContext);
+
+      listChangelogsSettings = PagedCallSettings.newBuilder(LIST_CHANGELOGS_PAGE_STR_FACT);
+      getChangelogSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
+              listChangelogsSettings, getChangelogSettings);
+      initDefaults(this);
+    }
+
+    protected Builder(ChangelogsStubSettings settings) {
+      super(settings);
+
+      listChangelogsSettings = settings.listChangelogsSettings.toBuilder();
+      getChangelogSettings = settings.getChangelogSettings.toBuilder();
+
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
+              listChangelogsSettings, getChangelogSettings);
+    }
+
+    private static Builder createDefault() {
+      Builder builder = new Builder(((ClientContext) null));
+
+      builder.setTransportChannelProvider(defaultTransportChannelProvider());
+      builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());
+      builder.setInternalHeaderProvider(defaultApiClientHeaderProviderBuilder().build());
+      builder.setEndpoint(getDefaultEndpoint());
+      builder.setMtlsEndpoint(getDefaultMtlsEndpoint());
+      builder.setSwitchToMtlsEndpointAllowed(true);
+
+      return initDefaults(builder);
+    }
+
+    private static Builder initDefaults(Builder builder) {
+      builder
+          .listChangelogsSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_0_params"));
+
+      builder
+          .getChangelogSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_0_params"));
+
+      return builder;
+    }
+
+    /**
+     * Applies the given settings updater function to all of the unary API methods in this service.
+     *
+     * <p>Note: This method does not support applying settings to streaming methods.
+     */
+    public Builder applyToAllUnaryMethods(
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) {
+      super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);
+      return this;
+    }
+
+    public ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders() {
+      return unaryMethodSettingsBuilders;
+    }
+
+    /** Returns the builder for the settings used for calls to listChangelogs. */
+    public PagedCallSettings.Builder<
+            ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+        listChangelogsSettings() {
+      return listChangelogsSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to getChangelog. */
+    public UnaryCallSettings.Builder<GetChangelogRequest, Changelog> getChangelogSettings() {
+      return getChangelogSettings;
+    }
+
+    @Override
+    public ChangelogsStubSettings build() throws IOException {
+      return new ChangelogsStubSettings(this);
+    }
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/GrpcChangelogsCallableFactory.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/GrpcChangelogsCallableFactory.java
new file mode 100644
index 000000000..24c6e8283
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/GrpcChangelogsCallableFactory.java
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3.stub;
+
+import com.google.api.gax.grpc.GrpcCallSettings;
+import com.google.api.gax.grpc.GrpcCallableFactory;
+import com.google.api.gax.grpc.GrpcStubCallableFactory;
+import com.google.api.gax.rpc.BatchingCallSettings;
+import com.google.api.gax.rpc.BidiStreamingCallable;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.ClientStreamingCallable;
+import com.google.api.gax.rpc.OperationCallSettings;
+import com.google.api.gax.rpc.OperationCallable;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.ServerStreamingCallSettings;
+import com.google.api.gax.rpc.ServerStreamingCallable;
+import com.google.api.gax.rpc.StreamingCallSettings;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.longrunning.Operation;
+import com.google.longrunning.stub.OperationsStub;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * gRPC callable factory implementation for the Changelogs service API.
+ *
+ * <p>This class is for advanced usage.
+ */
+@Generated("by gapic-generator-java")
+public class GrpcChangelogsCallableFactory implements GrpcStubCallableFactory {
+
+  @Override
+  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createUnaryCallable(
+      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+      UnaryCallSettings<RequestT, ResponseT> callSettings,
+      ClientContext clientContext) {
+    return GrpcCallableFactory.createUnaryCallable(grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT, PagedListResponseT>
+      UnaryCallable<RequestT, PagedListResponseT> createPagedCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          PagedCallSettings<RequestT, ResponseT, PagedListResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createPagedCallable(grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createBatchingCallable(
+      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+      BatchingCallSettings<RequestT, ResponseT> callSettings,
+      ClientContext clientContext) {
+    return GrpcCallableFactory.createBatchingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT, MetadataT>
+      OperationCallable<RequestT, ResponseT, MetadataT> createOperationCallable(
+          GrpcCallSettings<RequestT, Operation> grpcCallSettings,
+          OperationCallSettings<RequestT, ResponseT, MetadataT> callSettings,
+          ClientContext clientContext,
+          OperationsStub operationsStub) {
+    return GrpcCallableFactory.createOperationCallable(
+        grpcCallSettings, callSettings, clientContext, operationsStub);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      BidiStreamingCallable<RequestT, ResponseT> createBidiStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          StreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createBidiStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      ServerStreamingCallable<RequestT, ResponseT> createServerStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          ServerStreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createServerStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      ClientStreamingCallable<RequestT, ResponseT> createClientStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          StreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createClientStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/GrpcChangelogsStub.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/GrpcChangelogsStub.java
new file mode 100644
index 000000000..f20e31dc6
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3/stub/GrpcChangelogsStub.java
@@ -0,0 +1,205 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3.stub;
+
+import static com.google.cloud.dialogflow.cx.v3.ChangelogsClient.ListChangelogsPagedResponse;
+
+import com.google.api.gax.core.BackgroundResource;
+import com.google.api.gax.core.BackgroundResourceAggregation;
+import com.google.api.gax.grpc.GrpcCallSettings;
+import com.google.api.gax.grpc.GrpcStubCallableFactory;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.dialogflow.cx.v3.Changelog;
+import com.google.cloud.dialogflow.cx.v3.GetChangelogRequest;
+import com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest;
+import com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse;
+import com.google.common.collect.ImmutableMap;
+import com.google.longrunning.stub.GrpcOperationsStub;
+import io.grpc.MethodDescriptor;
+import io.grpc.protobuf.ProtoUtils;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * gRPC stub implementation for the Changelogs service API.
+ *
+ * <p>This class is for advanced usage and reflects the underlying API directly.
+ */
+@Generated("by gapic-generator-java")
+public class GrpcChangelogsStub extends ChangelogsStub {
+  private static final MethodDescriptor<ListChangelogsRequest, ListChangelogsResponse>
+      listChangelogsMethodDescriptor =
+          MethodDescriptor.<ListChangelogsRequest, ListChangelogsResponse>newBuilder()
+              .setType(MethodDescriptor.MethodType.UNARY)
+              .setFullMethodName("google.cloud.dialogflow.cx.v3.Changelogs/ListChangelogs")
+              .setRequestMarshaller(
+                  ProtoUtils.marshaller(ListChangelogsRequest.getDefaultInstance()))
+              .setResponseMarshaller(
+                  ProtoUtils.marshaller(ListChangelogsResponse.getDefaultInstance()))
+              .build();
+
+  private static final MethodDescriptor<GetChangelogRequest, Changelog>
+      getChangelogMethodDescriptor =
+          MethodDescriptor.<GetChangelogRequest, Changelog>newBuilder()
+              .setType(MethodDescriptor.MethodType.UNARY)
+              .setFullMethodName("google.cloud.dialogflow.cx.v3.Changelogs/GetChangelog")
+              .setRequestMarshaller(ProtoUtils.marshaller(GetChangelogRequest.getDefaultInstance()))
+              .setResponseMarshaller(ProtoUtils.marshaller(Changelog.getDefaultInstance()))
+              .build();
+
+  private final UnaryCallable<ListChangelogsRequest, ListChangelogsResponse> listChangelogsCallable;
+  private final UnaryCallable<ListChangelogsRequest, ListChangelogsPagedResponse>
+      listChangelogsPagedCallable;
+  private final UnaryCallable<GetChangelogRequest, Changelog> getChangelogCallable;
+
+  private final BackgroundResource backgroundResources;
+  private final GrpcOperationsStub operationsStub;
+  private final GrpcStubCallableFactory callableFactory;
+
+  public static final GrpcChangelogsStub create(ChangelogsStubSettings settings)
+      throws IOException {
+    return new GrpcChangelogsStub(settings, ClientContext.create(settings));
+  }
+
+  public static final GrpcChangelogsStub create(ClientContext clientContext) throws IOException {
+    return new GrpcChangelogsStub(ChangelogsStubSettings.newBuilder().build(), clientContext);
+  }
+
+  public static final GrpcChangelogsStub create(
+      ClientContext clientContext, GrpcStubCallableFactory callableFactory) throws IOException {
+    return new GrpcChangelogsStub(
+        ChangelogsStubSettings.newBuilder().build(), clientContext, callableFactory);
+  }
+
+  /**
+   * Constructs an instance of GrpcChangelogsStub, using the given settings. This is protected so
+   * that it is easy to make a subclass, but otherwise, the static factory methods should be
+   * preferred.
+   */
+  protected GrpcChangelogsStub(ChangelogsStubSettings settings, ClientContext clientContext)
+      throws IOException {
+    this(settings, clientContext, new GrpcChangelogsCallableFactory());
+  }
+
+  /**
+   * Constructs an instance of GrpcChangelogsStub, using the given settings. This is protected so
+   * that it is easy to make a subclass, but otherwise, the static factory methods should be
+   * preferred.
+   */
+  protected GrpcChangelogsStub(
+      ChangelogsStubSettings settings,
+      ClientContext clientContext,
+      GrpcStubCallableFactory callableFactory)
+      throws IOException {
+    this.callableFactory = callableFactory;
+    this.operationsStub = GrpcOperationsStub.create(clientContext, callableFactory);
+
+    GrpcCallSettings<ListChangelogsRequest, ListChangelogsResponse>
+        listChangelogsTransportSettings =
+            GrpcCallSettings.<ListChangelogsRequest, ListChangelogsResponse>newBuilder()
+                .setMethodDescriptor(listChangelogsMethodDescriptor)
+                .setParamsExtractor(
+                    request -> {
+                      ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                      params.put("parent", String.valueOf(request.getParent()));
+                      return params.build();
+                    })
+                .build();
+    GrpcCallSettings<GetChangelogRequest, Changelog> getChangelogTransportSettings =
+        GrpcCallSettings.<GetChangelogRequest, Changelog>newBuilder()
+            .setMethodDescriptor(getChangelogMethodDescriptor)
+            .setParamsExtractor(
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("name", String.valueOf(request.getName()));
+                  return params.build();
+                })
+            .build();
+
+    this.listChangelogsCallable =
+        callableFactory.createUnaryCallable(
+            listChangelogsTransportSettings, settings.listChangelogsSettings(), clientContext);
+    this.listChangelogsPagedCallable =
+        callableFactory.createPagedCallable(
+            listChangelogsTransportSettings, settings.listChangelogsSettings(), clientContext);
+    this.getChangelogCallable =
+        callableFactory.createUnaryCallable(
+            getChangelogTransportSettings, settings.getChangelogSettings(), clientContext);
+
+    this.backgroundResources =
+        new BackgroundResourceAggregation(clientContext.getBackgroundResources());
+  }
+
+  public GrpcOperationsStub getOperationsStub() {
+    return operationsStub;
+  }
+
+  @Override
+  public UnaryCallable<ListChangelogsRequest, ListChangelogsResponse> listChangelogsCallable() {
+    return listChangelogsCallable;
+  }
+
+  @Override
+  public UnaryCallable<ListChangelogsRequest, ListChangelogsPagedResponse>
+      listChangelogsPagedCallable() {
+    return listChangelogsPagedCallable;
+  }
+
+  @Override
+  public UnaryCallable<GetChangelogRequest, Changelog> getChangelogCallable() {
+    return getChangelogCallable;
+  }
+
+  @Override
+  public final void close() {
+    try {
+      backgroundResources.close();
+    } catch (RuntimeException e) {
+      throw e;
+    } catch (Exception e) {
+      throw new IllegalStateException("Failed to close resource", e);
+    }
+  }
+
+  @Override
+  public void shutdown() {
+    backgroundResources.shutdown();
+  }
+
+  @Override
+  public boolean isShutdown() {
+    return backgroundResources.isShutdown();
+  }
+
+  @Override
+  public boolean isTerminated() {
+    return backgroundResources.isTerminated();
+  }
+
+  @Override
+  public void shutdownNow() {
+    backgroundResources.shutdownNow();
+  }
+
+  @Override
+  public boolean awaitTermination(long duration, TimeUnit unit) throws InterruptedException {
+    return backgroundResources.awaitTermination(duration, unit);
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsClient.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsClient.java
new file mode 100644
index 000000000..277afe3c5
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsClient.java
@@ -0,0 +1,496 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+import com.google.api.core.ApiFuture;
+import com.google.api.core.ApiFutures;
+import com.google.api.core.BetaApi;
+import com.google.api.gax.core.BackgroundResource;
+import com.google.api.gax.paging.AbstractFixedSizeCollection;
+import com.google.api.gax.paging.AbstractPage;
+import com.google.api.gax.paging.AbstractPagedListResponse;
+import com.google.api.gax.rpc.PageContext;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.dialogflow.cx.v3beta1.stub.ChangelogsStub;
+import com.google.cloud.dialogflow.cx.v3beta1.stub.ChangelogsStubSettings;
+import com.google.common.util.concurrent.MoreExecutors;
+import java.io.IOException;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Service Description: Service for managing
+ * [Changelogs][google.cloud.dialogflow.cx.v3beta1.Changelog].
+ *
+ * <p>This class provides the ability to make remote calls to the backing service through method
+ * calls that map to API methods. Sample code to get started:
+ *
+ * <pre>{@code
+ * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+ *   ChangelogName name = ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]");
+ *   Changelog response = changelogsClient.getChangelog(name);
+ * }
+ * }</pre>
+ *
+ * <p>Note: close() needs to be called on the ChangelogsClient object to clean up resources such as
+ * threads. In the example above, try-with-resources is used, which automatically calls close().
+ *
+ * <p>The surface of this class includes several types of Java methods for each of the API's
+ * methods:
+ *
+ * <ol>
+ *   <li>A "flattened" method. With this type of method, the fields of the request type have been
+ *       converted into function parameters. It may be the case that not all fields are available as
+ *       parameters, and not every API method will have a flattened method entry point.
+ *   <li>A "request object" method. This type of method only takes one parameter, a request object,
+ *       which must be constructed before the call. Not every API method will have a request object
+ *       method.
+ *   <li>A "callable" method. This type of method takes no parameters and returns an immutable API
+ *       callable object, which can be used to initiate calls to the service.
+ * </ol>
+ *
+ * <p>See the individual methods for example code.
+ *
+ * <p>Many parameters require resource names to be formatted in a particular way. To assist with
+ * these names, this class includes a format method for each type of name, and additionally a parse
+ * method to extract the individual identifiers contained within names that are returned.
+ *
+ * <p>This class can be customized by passing in a custom instance of ChangelogsSettings to
+ * create(). For example:
+ *
+ * <p>To customize credentials:
+ *
+ * <pre>{@code
+ * ChangelogsSettings changelogsSettings =
+ *     ChangelogsSettings.newBuilder()
+ *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
+ *         .build();
+ * ChangelogsClient changelogsClient = ChangelogsClient.create(changelogsSettings);
+ * }</pre>
+ *
+ * <p>To customize the endpoint:
+ *
+ * <pre>{@code
+ * ChangelogsSettings changelogsSettings =
+ *     ChangelogsSettings.newBuilder().setEndpoint(myEndpoint).build();
+ * ChangelogsClient changelogsClient = ChangelogsClient.create(changelogsSettings);
+ * }</pre>
+ *
+ * <p>Please refer to the GitHub repository's samples for more quickstart code snippets.
+ */
+@BetaApi
+@Generated("by gapic-generator-java")
+public class ChangelogsClient implements BackgroundResource {
+  private final ChangelogsSettings settings;
+  private final ChangelogsStub stub;
+
+  /** Constructs an instance of ChangelogsClient with default settings. */
+  public static final ChangelogsClient create() throws IOException {
+    return create(ChangelogsSettings.newBuilder().build());
+  }
+
+  /**
+   * Constructs an instance of ChangelogsClient, using the given settings. The channels are created
+   * based on the settings passed in, or defaults for any settings that are not set.
+   */
+  public static final ChangelogsClient create(ChangelogsSettings settings) throws IOException {
+    return new ChangelogsClient(settings);
+  }
+
+  /**
+   * Constructs an instance of ChangelogsClient, using the given stub for making calls. This is for
+   * advanced usage - prefer using create(ChangelogsSettings).
+   */
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  public static final ChangelogsClient create(ChangelogsStub stub) {
+    return new ChangelogsClient(stub);
+  }
+
+  /**
+   * Constructs an instance of ChangelogsClient, using the given settings. This is protected so that
+   * it is easy to make a subclass, but otherwise, the static factory methods should be preferred.
+   */
+  protected ChangelogsClient(ChangelogsSettings settings) throws IOException {
+    this.settings = settings;
+    this.stub = ((ChangelogsStubSettings) settings.getStubSettings()).createStub();
+  }
+
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  protected ChangelogsClient(ChangelogsStub stub) {
+    this.settings = null;
+    this.stub = stub;
+  }
+
+  public final ChangelogsSettings getSettings() {
+    return settings;
+  }
+
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  public ChangelogsStub getStub() {
+    return stub;
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Returns the list of Changelogs.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   AgentName parent = AgentName.of("[PROJECT]", "[LOCATION]", "[AGENT]");
+   *   for (Changelog element : changelogsClient.listChangelogs(parent).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
+   * }
+   * }</pre>
+   *
+   * @param parent Required. The agent containing the changelogs. Format: `projects/&lt;Project
+   *     ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final ListChangelogsPagedResponse listChangelogs(AgentName parent) {
+    ListChangelogsRequest request =
+        ListChangelogsRequest.newBuilder()
+            .setParent(parent == null ? null : parent.toString())
+            .build();
+    return listChangelogs(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Returns the list of Changelogs.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   String parent =
+   *       ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString();
+   *   for (Changelog element : changelogsClient.listChangelogs(parent).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
+   * }
+   * }</pre>
+   *
+   * @param parent Required. The agent containing the changelogs. Format: `projects/&lt;Project
+   *     ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final ListChangelogsPagedResponse listChangelogs(String parent) {
+    ListChangelogsRequest request = ListChangelogsRequest.newBuilder().setParent(parent).build();
+    return listChangelogs(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Returns the list of Changelogs.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   ListChangelogsRequest request =
+   *       ListChangelogsRequest.newBuilder()
+   *           .setParent(
+   *               ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+   *           .setFilter("filter-1274492040")
+   *           .setPageSize(883849137)
+   *           .setPageToken("pageToken873572522")
+   *           .build();
+   *   for (Changelog element : changelogsClient.listChangelogs(request).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
+   * }
+   * }</pre>
+   *
+   * @param request The request object containing all of the parameters for the API call.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final ListChangelogsPagedResponse listChangelogs(ListChangelogsRequest request) {
+    return listChangelogsPagedCallable().call(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Returns the list of Changelogs.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   ListChangelogsRequest request =
+   *       ListChangelogsRequest.newBuilder()
+   *           .setParent(
+   *               ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+   *           .setFilter("filter-1274492040")
+   *           .setPageSize(883849137)
+   *           .setPageToken("pageToken873572522")
+   *           .build();
+   *   ApiFuture<Changelog> future =
+   *       changelogsClient.listChangelogsPagedCallable().futureCall(request);
+   *   // Do something.
+   *   for (Changelog element : future.get().iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
+   * }
+   * }</pre>
+   */
+  public final UnaryCallable<ListChangelogsRequest, ListChangelogsPagedResponse>
+      listChangelogsPagedCallable() {
+    return stub.listChangelogsPagedCallable();
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Returns the list of Changelogs.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   ListChangelogsRequest request =
+   *       ListChangelogsRequest.newBuilder()
+   *           .setParent(
+   *               ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+   *           .setFilter("filter-1274492040")
+   *           .setPageSize(883849137)
+   *           .setPageToken("pageToken873572522")
+   *           .build();
+   *   while (true) {
+   *     ListChangelogsResponse response = changelogsClient.listChangelogsCallable().call(request);
+   *     for (Changelog element : response.getResponsesList()) {
+   *       // doThingsWith(element);
+   *     }
+   *     String nextPageToken = response.getNextPageToken();
+   *     if (!Strings.isNullOrEmpty(nextPageToken)) {
+   *       request = request.toBuilder().setPageToken(nextPageToken).build();
+   *     } else {
+   *       break;
+   *     }
+   *   }
+   * }
+   * }</pre>
+   */
+  public final UnaryCallable<ListChangelogsRequest, ListChangelogsResponse>
+      listChangelogsCallable() {
+    return stub.listChangelogsCallable();
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Retrieves the specified Changelog.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   ChangelogName name = ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]");
+   *   Changelog response = changelogsClient.getChangelog(name);
+   * }
+   * }</pre>
+   *
+   * @param name Required. The name of the changelog to get. Format: `projects/&lt;Project
+   *     ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;/changelogs/&lt;Changelog
+   *     ID&gt;`.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final Changelog getChangelog(ChangelogName name) {
+    GetChangelogRequest request =
+        GetChangelogRequest.newBuilder().setName(name == null ? null : name.toString()).build();
+    return getChangelog(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Retrieves the specified Changelog.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   String name =
+   *       ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString();
+   *   Changelog response = changelogsClient.getChangelog(name);
+   * }
+   * }</pre>
+   *
+   * @param name Required. The name of the changelog to get. Format: `projects/&lt;Project
+   *     ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;/changelogs/&lt;Changelog
+   *     ID&gt;`.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final Changelog getChangelog(String name) {
+    GetChangelogRequest request = GetChangelogRequest.newBuilder().setName(name).build();
+    return getChangelog(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Retrieves the specified Changelog.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   GetChangelogRequest request =
+   *       GetChangelogRequest.newBuilder()
+   *           .setName(
+   *               ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+   *           .build();
+   *   Changelog response = changelogsClient.getChangelog(request);
+   * }
+   * }</pre>
+   *
+   * @param request The request object containing all of the parameters for the API call.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final Changelog getChangelog(GetChangelogRequest request) {
+    return getChangelogCallable().call(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Retrieves the specified Changelog.
+   *
+   * <p>Sample code:
+   *
+   * <pre>{@code
+   * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+   *   GetChangelogRequest request =
+   *       GetChangelogRequest.newBuilder()
+   *           .setName(
+   *               ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+   *           .build();
+   *   ApiFuture<Changelog> future = changelogsClient.getChangelogCallable().futureCall(request);
+   *   // Do something.
+   *   Changelog response = future.get();
+   * }
+   * }</pre>
+   */
+  public final UnaryCallable<GetChangelogRequest, Changelog> getChangelogCallable() {
+    return stub.getChangelogCallable();
+  }
+
+  @Override
+  public final void close() {
+    stub.close();
+  }
+
+  @Override
+  public void shutdown() {
+    stub.shutdown();
+  }
+
+  @Override
+  public boolean isShutdown() {
+    return stub.isShutdown();
+  }
+
+  @Override
+  public boolean isTerminated() {
+    return stub.isTerminated();
+  }
+
+  @Override
+  public void shutdownNow() {
+    stub.shutdownNow();
+  }
+
+  @Override
+  public boolean awaitTermination(long duration, TimeUnit unit) throws InterruptedException {
+    return stub.awaitTermination(duration, unit);
+  }
+
+  public static class ListChangelogsPagedResponse
+      extends AbstractPagedListResponse<
+          ListChangelogsRequest,
+          ListChangelogsResponse,
+          Changelog,
+          ListChangelogsPage,
+          ListChangelogsFixedSizeCollection> {
+
+    public static ApiFuture<ListChangelogsPagedResponse> createAsync(
+        PageContext<ListChangelogsRequest, ListChangelogsResponse, Changelog> context,
+        ApiFuture<ListChangelogsResponse> futureResponse) {
+      ApiFuture<ListChangelogsPage> futurePage =
+          ListChangelogsPage.createEmptyPage().createPageAsync(context, futureResponse);
+      return ApiFutures.transform(
+          futurePage,
+          input -> new ListChangelogsPagedResponse(input),
+          MoreExecutors.directExecutor());
+    }
+
+    private ListChangelogsPagedResponse(ListChangelogsPage page) {
+      super(page, ListChangelogsFixedSizeCollection.createEmptyCollection());
+    }
+  }
+
+  public static class ListChangelogsPage
+      extends AbstractPage<
+          ListChangelogsRequest, ListChangelogsResponse, Changelog, ListChangelogsPage> {
+
+    private ListChangelogsPage(
+        PageContext<ListChangelogsRequest, ListChangelogsResponse, Changelog> context,
+        ListChangelogsResponse response) {
+      super(context, response);
+    }
+
+    private static ListChangelogsPage createEmptyPage() {
+      return new ListChangelogsPage(null, null);
+    }
+
+    @Override
+    protected ListChangelogsPage createPage(
+        PageContext<ListChangelogsRequest, ListChangelogsResponse, Changelog> context,
+        ListChangelogsResponse response) {
+      return new ListChangelogsPage(context, response);
+    }
+
+    @Override
+    public ApiFuture<ListChangelogsPage> createPageAsync(
+        PageContext<ListChangelogsRequest, ListChangelogsResponse, Changelog> context,
+        ApiFuture<ListChangelogsResponse> futureResponse) {
+      return super.createPageAsync(context, futureResponse);
+    }
+  }
+
+  public static class ListChangelogsFixedSizeCollection
+      extends AbstractFixedSizeCollection<
+          ListChangelogsRequest,
+          ListChangelogsResponse,
+          Changelog,
+          ListChangelogsPage,
+          ListChangelogsFixedSizeCollection> {
+
+    private ListChangelogsFixedSizeCollection(List<ListChangelogsPage> pages, int collectionSize) {
+      super(pages, collectionSize);
+    }
+
+    private static ListChangelogsFixedSizeCollection createEmptyCollection() {
+      return new ListChangelogsFixedSizeCollection(null, 0);
+    }
+
+    @Override
+    protected ListChangelogsFixedSizeCollection createCollection(
+        List<ListChangelogsPage> pages, int collectionSize) {
+      return new ListChangelogsFixedSizeCollection(pages, collectionSize);
+    }
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsSettings.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsSettings.java
new file mode 100644
index 000000000..5ee2e6322
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsSettings.java
@@ -0,0 +1,197 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+import static com.google.cloud.dialogflow.cx.v3beta1.ChangelogsClient.ListChangelogsPagedResponse;
+
+import com.google.api.core.ApiFunction;
+import com.google.api.core.BetaApi;
+import com.google.api.gax.core.GoogleCredentialsProvider;
+import com.google.api.gax.core.InstantiatingExecutorProvider;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.ClientSettings;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.TransportChannelProvider;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.cloud.dialogflow.cx.v3beta1.stub.ChangelogsStubSettings;
+import java.io.IOException;
+import java.util.List;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Settings class to configure an instance of {@link ChangelogsClient}.
+ *
+ * <p>The default instance has everything set to sensible defaults:
+ *
+ * <ul>
+ *   <li>The default service address (dialogflow.googleapis.com) and default port (443) are used.
+ *   <li>Credentials are acquired automatically through Application Default Credentials.
+ *   <li>Retries are configured for idempotent methods but not for non-idempotent methods.
+ * </ul>
+ *
+ * <p>The builder of this class is recursive, so contained classes are themselves builders. When
+ * build() is called, the tree of builders is called to create the complete settings object.
+ *
+ * <p>For example, to set the total timeout of getChangelog to 30 seconds:
+ *
+ * <pre>{@code
+ * ChangelogsSettings.Builder changelogsSettingsBuilder = ChangelogsSettings.newBuilder();
+ * changelogsSettingsBuilder
+ *     .getChangelogSettings()
+ *     .setRetrySettings(
+ *         changelogsSettingsBuilder
+ *             .getChangelogSettings()
+ *             .getRetrySettings()
+ *             .toBuilder()
+ *             .setTotalTimeout(Duration.ofSeconds(30))
+ *             .build());
+ * ChangelogsSettings changelogsSettings = changelogsSettingsBuilder.build();
+ * }</pre>
+ */
+@BetaApi
+@Generated("by gapic-generator-java")
+public class ChangelogsSettings extends ClientSettings<ChangelogsSettings> {
+
+  /** Returns the object with the settings used for calls to listChangelogs. */
+  public PagedCallSettings<
+          ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+      listChangelogsSettings() {
+    return ((ChangelogsStubSettings) getStubSettings()).listChangelogsSettings();
+  }
+
+  /** Returns the object with the settings used for calls to getChangelog. */
+  public UnaryCallSettings<GetChangelogRequest, Changelog> getChangelogSettings() {
+    return ((ChangelogsStubSettings) getStubSettings()).getChangelogSettings();
+  }
+
+  public static final ChangelogsSettings create(ChangelogsStubSettings stub) throws IOException {
+    return new ChangelogsSettings.Builder(stub.toBuilder()).build();
+  }
+
+  /** Returns a builder for the default ExecutorProvider for this service. */
+  public static InstantiatingExecutorProvider.Builder defaultExecutorProviderBuilder() {
+    return ChangelogsStubSettings.defaultExecutorProviderBuilder();
+  }
+
+  /** Returns the default service endpoint. */
+  public static String getDefaultEndpoint() {
+    return ChangelogsStubSettings.getDefaultEndpoint();
+  }
+
+  /** Returns the default service scopes. */
+  public static List<String> getDefaultServiceScopes() {
+    return ChangelogsStubSettings.getDefaultServiceScopes();
+  }
+
+  /** Returns a builder for the default credentials for this service. */
+  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
+    return ChangelogsStubSettings.defaultCredentialsProviderBuilder();
+  }
+
+  /** Returns a builder for the default ChannelProvider for this service. */
+  public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
+    return ChangelogsStubSettings.defaultGrpcTransportProviderBuilder();
+  }
+
+  public static TransportChannelProvider defaultTransportChannelProvider() {
+    return ChangelogsStubSettings.defaultTransportChannelProvider();
+  }
+
+  @BetaApi("The surface for customizing headers is not stable yet and may change in the future.")
+  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+    return ChangelogsStubSettings.defaultApiClientHeaderProviderBuilder();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder() {
+    return Builder.createDefault();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder(ClientContext clientContext) {
+    return new Builder(clientContext);
+  }
+
+  /** Returns a builder containing all the values of this settings class. */
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  protected ChangelogsSettings(Builder settingsBuilder) throws IOException {
+    super(settingsBuilder);
+  }
+
+  /** Builder for ChangelogsSettings. */
+  public static class Builder extends ClientSettings.Builder<ChangelogsSettings, Builder> {
+
+    protected Builder() throws IOException {
+      this(((ClientContext) null));
+    }
+
+    protected Builder(ClientContext clientContext) {
+      super(ChangelogsStubSettings.newBuilder(clientContext));
+    }
+
+    protected Builder(ChangelogsSettings settings) {
+      super(settings.getStubSettings().toBuilder());
+    }
+
+    protected Builder(ChangelogsStubSettings.Builder stubSettings) {
+      super(stubSettings);
+    }
+
+    private static Builder createDefault() {
+      return new Builder(ChangelogsStubSettings.newBuilder());
+    }
+
+    public ChangelogsStubSettings.Builder getStubSettingsBuilder() {
+      return ((ChangelogsStubSettings.Builder) getStubSettings());
+    }
+
+    /**
+     * Applies the given settings updater function to all of the unary API methods in this service.
+     *
+     * <p>Note: This method does not support applying settings to streaming methods.
+     */
+    public Builder applyToAllUnaryMethods(
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) {
+      super.applyToAllUnaryMethods(
+          getStubSettingsBuilder().unaryMethodSettingsBuilders(), settingsUpdater);
+      return this;
+    }
+
+    /** Returns the builder for the settings used for calls to listChangelogs. */
+    public PagedCallSettings.Builder<
+            ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+        listChangelogsSettings() {
+      return getStubSettingsBuilder().listChangelogsSettings();
+    }
+
+    /** Returns the builder for the settings used for calls to getChangelog. */
+    public UnaryCallSettings.Builder<GetChangelogRequest, Changelog> getChangelogSettings() {
+      return getStubSettingsBuilder().getChangelogSettings();
+    }
+
+    @Override
+    public ChangelogsSettings build() throws IOException {
+      return new ChangelogsSettings(this);
+    }
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/gapic_metadata.json b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/gapic_metadata.json
index 106c29b07..f85400e58 100644
--- a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/gapic_metadata.json
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/gapic_metadata.json
@@ -41,6 +41,21 @@
         }
       }
     },
+    "Changelogs": {
+      "clients": {
+        "grpc": {
+          "libraryClient": "ChangelogsClient",
+          "rpcs": {
+            "GetChangelog": {
+              "methods": ["getChangelog", "getChangelog", "getChangelog", "getChangelogCallable"]
+            },
+            "ListChangelogs": {
+              "methods": ["listChangelogs", "listChangelogs", "listChangelogs", "listChangelogsPagedCallable", "listChangelogsCallable"]
+            }
+          }
+        }
+      }
+    },
     "Deployments": {
       "clients": {
         "grpc": {
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/package-info.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/package-info.java
index f891eb9b9..fd53dd24a 100644
--- a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/package-info.java
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/package-info.java
@@ -32,6 +32,20 @@
  * }
  * }</pre>
  *
+ * <p>======================= ChangelogsClient =======================
+ *
+ * <p>Service Description: Service for managing
+ * [Changelogs][google.cloud.dialogflow.cx.v3beta1.Changelog].
+ *
+ * <p>Sample for ChangelogsClient:
+ *
+ * <pre>{@code
+ * try (ChangelogsClient changelogsClient = ChangelogsClient.create()) {
+ *   ChangelogName name = ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]");
+ *   Changelog response = changelogsClient.getChangelog(name);
+ * }
+ * }</pre>
+ *
  * <p>======================= DeploymentsClient =======================
  *
  * <p>Service Description: Service for managing
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/ChangelogsStub.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/ChangelogsStub.java
new file mode 100644
index 000000000..5088976da
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/ChangelogsStub.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3beta1.stub;
+
+import static com.google.cloud.dialogflow.cx.v3beta1.ChangelogsClient.ListChangelogsPagedResponse;
+
+import com.google.api.core.BetaApi;
+import com.google.api.gax.core.BackgroundResource;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.dialogflow.cx.v3beta1.Changelog;
+import com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest;
+import com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest;
+import com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Base stub class for the Changelogs service API.
+ *
+ * <p>This class is for advanced usage and reflects the underlying API directly.
+ */
+@BetaApi
+@Generated("by gapic-generator-java")
+public abstract class ChangelogsStub implements BackgroundResource {
+
+  public UnaryCallable<ListChangelogsRequest, ListChangelogsPagedResponse>
+      listChangelogsPagedCallable() {
+    throw new UnsupportedOperationException("Not implemented: listChangelogsPagedCallable()");
+  }
+
+  public UnaryCallable<ListChangelogsRequest, ListChangelogsResponse> listChangelogsCallable() {
+    throw new UnsupportedOperationException("Not implemented: listChangelogsCallable()");
+  }
+
+  public UnaryCallable<GetChangelogRequest, Changelog> getChangelogCallable() {
+    throw new UnsupportedOperationException("Not implemented: getChangelogCallable()");
+  }
+
+  @Override
+  public abstract void close();
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/ChangelogsStubSettings.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/ChangelogsStubSettings.java
new file mode 100644
index 000000000..b6123ea3a
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/ChangelogsStubSettings.java
@@ -0,0 +1,372 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3beta1.stub;
+
+import static com.google.cloud.dialogflow.cx.v3beta1.ChangelogsClient.ListChangelogsPagedResponse;
+
+import com.google.api.core.ApiFunction;
+import com.google.api.core.ApiFuture;
+import com.google.api.core.BetaApi;
+import com.google.api.gax.core.GaxProperties;
+import com.google.api.gax.core.GoogleCredentialsProvider;
+import com.google.api.gax.core.InstantiatingExecutorProvider;
+import com.google.api.gax.grpc.GaxGrpcProperties;
+import com.google.api.gax.grpc.GrpcTransportChannel;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.retrying.RetrySettings;
+import com.google.api.gax.rpc.ApiCallContext;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.PageContext;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.PagedListDescriptor;
+import com.google.api.gax.rpc.PagedListResponseFactory;
+import com.google.api.gax.rpc.StatusCode;
+import com.google.api.gax.rpc.StubSettings;
+import com.google.api.gax.rpc.TransportChannelProvider;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.dialogflow.cx.v3beta1.Changelog;
+import com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest;
+import com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest;
+import com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Lists;
+import java.io.IOException;
+import java.util.List;
+import javax.annotation.Generated;
+import org.threeten.bp.Duration;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Settings class to configure an instance of {@link ChangelogsStub}.
+ *
+ * <p>The default instance has everything set to sensible defaults:
+ *
+ * <ul>
+ *   <li>The default service address (dialogflow.googleapis.com) and default port (443) are used.
+ *   <li>Credentials are acquired automatically through Application Default Credentials.
+ *   <li>Retries are configured for idempotent methods but not for non-idempotent methods.
+ * </ul>
+ *
+ * <p>The builder of this class is recursive, so contained classes are themselves builders. When
+ * build() is called, the tree of builders is called to create the complete settings object.
+ *
+ * <p>For example, to set the total timeout of getChangelog to 30 seconds:
+ *
+ * <pre>{@code
+ * ChangelogsStubSettings.Builder changelogsSettingsBuilder = ChangelogsStubSettings.newBuilder();
+ * changelogsSettingsBuilder
+ *     .getChangelogSettings()
+ *     .setRetrySettings(
+ *         changelogsSettingsBuilder
+ *             .getChangelogSettings()
+ *             .getRetrySettings()
+ *             .toBuilder()
+ *             .setTotalTimeout(Duration.ofSeconds(30))
+ *             .build());
+ * ChangelogsStubSettings changelogsSettings = changelogsSettingsBuilder.build();
+ * }</pre>
+ */
+@BetaApi
+@Generated("by gapic-generator-java")
+public class ChangelogsStubSettings extends StubSettings<ChangelogsStubSettings> {
+  /** The default scopes of the service. */
+  private static final ImmutableList<String> DEFAULT_SERVICE_SCOPES =
+      ImmutableList.<String>builder()
+          .add("https://www.googleapis.com/auth/cloud-platform")
+          .add("https://www.googleapis.com/auth/dialogflow")
+          .build();
+
+  private final PagedCallSettings<
+          ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+      listChangelogsSettings;
+  private final UnaryCallSettings<GetChangelogRequest, Changelog> getChangelogSettings;
+
+  private static final PagedListDescriptor<ListChangelogsRequest, ListChangelogsResponse, Changelog>
+      LIST_CHANGELOGS_PAGE_STR_DESC =
+          new PagedListDescriptor<ListChangelogsRequest, ListChangelogsResponse, Changelog>() {
+            @Override
+            public String emptyToken() {
+              return "";
+            }
+
+            @Override
+            public ListChangelogsRequest injectToken(ListChangelogsRequest payload, String token) {
+              return ListChangelogsRequest.newBuilder(payload).setPageToken(token).build();
+            }
+
+            @Override
+            public ListChangelogsRequest injectPageSize(
+                ListChangelogsRequest payload, int pageSize) {
+              return ListChangelogsRequest.newBuilder(payload).setPageSize(pageSize).build();
+            }
+
+            @Override
+            public Integer extractPageSize(ListChangelogsRequest payload) {
+              return payload.getPageSize();
+            }
+
+            @Override
+            public String extractNextToken(ListChangelogsResponse payload) {
+              return payload.getNextPageToken();
+            }
+
+            @Override
+            public Iterable<Changelog> extractResources(ListChangelogsResponse payload) {
+              return payload.getChangelogsList() == null
+                  ? ImmutableList.<Changelog>of()
+                  : payload.getChangelogsList();
+            }
+          };
+
+  private static final PagedListResponseFactory<
+          ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+      LIST_CHANGELOGS_PAGE_STR_FACT =
+          new PagedListResponseFactory<
+              ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>() {
+            @Override
+            public ApiFuture<ListChangelogsPagedResponse> getFuturePagedResponse(
+                UnaryCallable<ListChangelogsRequest, ListChangelogsResponse> callable,
+                ListChangelogsRequest request,
+                ApiCallContext context,
+                ApiFuture<ListChangelogsResponse> futureResponse) {
+              PageContext<ListChangelogsRequest, ListChangelogsResponse, Changelog> pageContext =
+                  PageContext.create(callable, LIST_CHANGELOGS_PAGE_STR_DESC, request, context);
+              return ListChangelogsPagedResponse.createAsync(pageContext, futureResponse);
+            }
+          };
+
+  /** Returns the object with the settings used for calls to listChangelogs. */
+  public PagedCallSettings<
+          ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+      listChangelogsSettings() {
+    return listChangelogsSettings;
+  }
+
+  /** Returns the object with the settings used for calls to getChangelog. */
+  public UnaryCallSettings<GetChangelogRequest, Changelog> getChangelogSettings() {
+    return getChangelogSettings;
+  }
+
+  @BetaApi("A restructuring of stub classes is planned, so this may break in the future")
+  public ChangelogsStub createStub() throws IOException {
+    if (getTransportChannelProvider()
+        .getTransportName()
+        .equals(GrpcTransportChannel.getGrpcTransportName())) {
+      return GrpcChangelogsStub.create(this);
+    }
+    throw new UnsupportedOperationException(
+        String.format(
+            "Transport not supported: %s", getTransportChannelProvider().getTransportName()));
+  }
+
+  /** Returns a builder for the default ExecutorProvider for this service. */
+  public static InstantiatingExecutorProvider.Builder defaultExecutorProviderBuilder() {
+    return InstantiatingExecutorProvider.newBuilder();
+  }
+
+  /** Returns the default service endpoint. */
+  public static String getDefaultEndpoint() {
+    return "dialogflow.googleapis.com:443";
+  }
+
+  /** Returns the default mTLS service endpoint. */
+  public static String getDefaultMtlsEndpoint() {
+    return "dialogflow.mtls.googleapis.com:443";
+  }
+
+  /** Returns the default service scopes. */
+  public static List<String> getDefaultServiceScopes() {
+    return DEFAULT_SERVICE_SCOPES;
+  }
+
+  /** Returns a builder for the default credentials for this service. */
+  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
+    return GoogleCredentialsProvider.newBuilder()
+        .setScopesToApply(DEFAULT_SERVICE_SCOPES)
+        .setUseJwtAccessWithScope(true);
+  }
+
+  /** Returns a builder for the default ChannelProvider for this service. */
+  public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
+    return InstantiatingGrpcChannelProvider.newBuilder()
+        .setMaxInboundMessageSize(Integer.MAX_VALUE);
+  }
+
+  public static TransportChannelProvider defaultTransportChannelProvider() {
+    return defaultGrpcTransportProviderBuilder().build();
+  }
+
+  @BetaApi("The surface for customizing headers is not stable yet and may change in the future.")
+  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+    return ApiClientHeaderProvider.newBuilder()
+        .setGeneratedLibToken(
+            "gapic", GaxProperties.getLibraryVersion(ChangelogsStubSettings.class))
+        .setTransportToken(
+            GaxGrpcProperties.getGrpcTokenName(), GaxGrpcProperties.getGrpcVersion());
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder() {
+    return Builder.createDefault();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder(ClientContext clientContext) {
+    return new Builder(clientContext);
+  }
+
+  /** Returns a builder containing all the values of this settings class. */
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  protected ChangelogsStubSettings(Builder settingsBuilder) throws IOException {
+    super(settingsBuilder);
+
+    listChangelogsSettings = settingsBuilder.listChangelogsSettings().build();
+    getChangelogSettings = settingsBuilder.getChangelogSettings().build();
+  }
+
+  /** Builder for ChangelogsStubSettings. */
+  public static class Builder extends StubSettings.Builder<ChangelogsStubSettings, Builder> {
+    private final ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders;
+    private final PagedCallSettings.Builder<
+            ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+        listChangelogsSettings;
+    private final UnaryCallSettings.Builder<GetChangelogRequest, Changelog> getChangelogSettings;
+    private static final ImmutableMap<String, ImmutableSet<StatusCode.Code>>
+        RETRYABLE_CODE_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, ImmutableSet<StatusCode.Code>> definitions =
+          ImmutableMap.builder();
+      definitions.put(
+          "retry_policy_0_codes",
+          ImmutableSet.copyOf(Lists.<StatusCode.Code>newArrayList(StatusCode.Code.UNAVAILABLE)));
+      RETRYABLE_CODE_DEFINITIONS = definitions.build();
+    }
+
+    private static final ImmutableMap<String, RetrySettings> RETRY_PARAM_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, RetrySettings> definitions = ImmutableMap.builder();
+      RetrySettings settings = null;
+      settings =
+          RetrySettings.newBuilder()
+              .setInitialRetryDelay(Duration.ofMillis(100L))
+              .setRetryDelayMultiplier(1.3)
+              .setMaxRetryDelay(Duration.ofMillis(60000L))
+              .setInitialRpcTimeout(Duration.ofMillis(60000L))
+              .setRpcTimeoutMultiplier(1.0)
+              .setMaxRpcTimeout(Duration.ofMillis(60000L))
+              .setTotalTimeout(Duration.ofMillis(60000L))
+              .build();
+      definitions.put("retry_policy_0_params", settings);
+      RETRY_PARAM_DEFINITIONS = definitions.build();
+    }
+
+    protected Builder() {
+      this(((ClientContext) null));
+    }
+
+    protected Builder(ClientContext clientContext) {
+      super(clientContext);
+
+      listChangelogsSettings = PagedCallSettings.newBuilder(LIST_CHANGELOGS_PAGE_STR_FACT);
+      getChangelogSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
+              listChangelogsSettings, getChangelogSettings);
+      initDefaults(this);
+    }
+
+    protected Builder(ChangelogsStubSettings settings) {
+      super(settings);
+
+      listChangelogsSettings = settings.listChangelogsSettings.toBuilder();
+      getChangelogSettings = settings.getChangelogSettings.toBuilder();
+
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
+              listChangelogsSettings, getChangelogSettings);
+    }
+
+    private static Builder createDefault() {
+      Builder builder = new Builder(((ClientContext) null));
+
+      builder.setTransportChannelProvider(defaultTransportChannelProvider());
+      builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());
+      builder.setInternalHeaderProvider(defaultApiClientHeaderProviderBuilder().build());
+      builder.setEndpoint(getDefaultEndpoint());
+      builder.setMtlsEndpoint(getDefaultMtlsEndpoint());
+      builder.setSwitchToMtlsEndpointAllowed(true);
+
+      return initDefaults(builder);
+    }
+
+    private static Builder initDefaults(Builder builder) {
+      builder
+          .listChangelogsSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_0_params"));
+
+      builder
+          .getChangelogSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("retry_policy_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("retry_policy_0_params"));
+
+      return builder;
+    }
+
+    /**
+     * Applies the given settings updater function to all of the unary API methods in this service.
+     *
+     * <p>Note: This method does not support applying settings to streaming methods.
+     */
+    public Builder applyToAllUnaryMethods(
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) {
+      super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);
+      return this;
+    }
+
+    public ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders() {
+      return unaryMethodSettingsBuilders;
+    }
+
+    /** Returns the builder for the settings used for calls to listChangelogs. */
+    public PagedCallSettings.Builder<
+            ListChangelogsRequest, ListChangelogsResponse, ListChangelogsPagedResponse>
+        listChangelogsSettings() {
+      return listChangelogsSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to getChangelog. */
+    public UnaryCallSettings.Builder<GetChangelogRequest, Changelog> getChangelogSettings() {
+      return getChangelogSettings;
+    }
+
+    @Override
+    public ChangelogsStubSettings build() throws IOException {
+      return new ChangelogsStubSettings(this);
+    }
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/GrpcChangelogsCallableFactory.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/GrpcChangelogsCallableFactory.java
new file mode 100644
index 000000000..ec5d2ebd5
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/GrpcChangelogsCallableFactory.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3beta1.stub;
+
+import com.google.api.core.BetaApi;
+import com.google.api.gax.grpc.GrpcCallSettings;
+import com.google.api.gax.grpc.GrpcCallableFactory;
+import com.google.api.gax.grpc.GrpcStubCallableFactory;
+import com.google.api.gax.rpc.BatchingCallSettings;
+import com.google.api.gax.rpc.BidiStreamingCallable;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.ClientStreamingCallable;
+import com.google.api.gax.rpc.OperationCallSettings;
+import com.google.api.gax.rpc.OperationCallable;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.ServerStreamingCallSettings;
+import com.google.api.gax.rpc.ServerStreamingCallable;
+import com.google.api.gax.rpc.StreamingCallSettings;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.longrunning.Operation;
+import com.google.longrunning.stub.OperationsStub;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * gRPC callable factory implementation for the Changelogs service API.
+ *
+ * <p>This class is for advanced usage.
+ */
+@BetaApi
+@Generated("by gapic-generator-java")
+public class GrpcChangelogsCallableFactory implements GrpcStubCallableFactory {
+
+  @Override
+  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createUnaryCallable(
+      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+      UnaryCallSettings<RequestT, ResponseT> callSettings,
+      ClientContext clientContext) {
+    return GrpcCallableFactory.createUnaryCallable(grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT, PagedListResponseT>
+      UnaryCallable<RequestT, PagedListResponseT> createPagedCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          PagedCallSettings<RequestT, ResponseT, PagedListResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createPagedCallable(grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createBatchingCallable(
+      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+      BatchingCallSettings<RequestT, ResponseT> callSettings,
+      ClientContext clientContext) {
+    return GrpcCallableFactory.createBatchingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT, MetadataT>
+      OperationCallable<RequestT, ResponseT, MetadataT> createOperationCallable(
+          GrpcCallSettings<RequestT, Operation> grpcCallSettings,
+          OperationCallSettings<RequestT, ResponseT, MetadataT> callSettings,
+          ClientContext clientContext,
+          OperationsStub operationsStub) {
+    return GrpcCallableFactory.createOperationCallable(
+        grpcCallSettings, callSettings, clientContext, operationsStub);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      BidiStreamingCallable<RequestT, ResponseT> createBidiStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          StreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createBidiStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      ServerStreamingCallable<RequestT, ResponseT> createServerStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          ServerStreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createServerStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+
+  @Override
+  public <RequestT, ResponseT>
+      ClientStreamingCallable<RequestT, ResponseT> createClientStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          StreamingCallSettings<RequestT, ResponseT> callSettings,
+          ClientContext clientContext) {
+    return GrpcCallableFactory.createClientStreamingCallable(
+        grpcCallSettings, callSettings, clientContext);
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/GrpcChangelogsStub.java b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/GrpcChangelogsStub.java
new file mode 100644
index 000000000..36883e3d0
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/stub/GrpcChangelogsStub.java
@@ -0,0 +1,207 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3beta1.stub;
+
+import static com.google.cloud.dialogflow.cx.v3beta1.ChangelogsClient.ListChangelogsPagedResponse;
+
+import com.google.api.core.BetaApi;
+import com.google.api.gax.core.BackgroundResource;
+import com.google.api.gax.core.BackgroundResourceAggregation;
+import com.google.api.gax.grpc.GrpcCallSettings;
+import com.google.api.gax.grpc.GrpcStubCallableFactory;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.dialogflow.cx.v3beta1.Changelog;
+import com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest;
+import com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest;
+import com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse;
+import com.google.common.collect.ImmutableMap;
+import com.google.longrunning.stub.GrpcOperationsStub;
+import io.grpc.MethodDescriptor;
+import io.grpc.protobuf.ProtoUtils;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * gRPC stub implementation for the Changelogs service API.
+ *
+ * <p>This class is for advanced usage and reflects the underlying API directly.
+ */
+@BetaApi
+@Generated("by gapic-generator-java")
+public class GrpcChangelogsStub extends ChangelogsStub {
+  private static final MethodDescriptor<ListChangelogsRequest, ListChangelogsResponse>
+      listChangelogsMethodDescriptor =
+          MethodDescriptor.<ListChangelogsRequest, ListChangelogsResponse>newBuilder()
+              .setType(MethodDescriptor.MethodType.UNARY)
+              .setFullMethodName("google.cloud.dialogflow.cx.v3beta1.Changelogs/ListChangelogs")
+              .setRequestMarshaller(
+                  ProtoUtils.marshaller(ListChangelogsRequest.getDefaultInstance()))
+              .setResponseMarshaller(
+                  ProtoUtils.marshaller(ListChangelogsResponse.getDefaultInstance()))
+              .build();
+
+  private static final MethodDescriptor<GetChangelogRequest, Changelog>
+      getChangelogMethodDescriptor =
+          MethodDescriptor.<GetChangelogRequest, Changelog>newBuilder()
+              .setType(MethodDescriptor.MethodType.UNARY)
+              .setFullMethodName("google.cloud.dialogflow.cx.v3beta1.Changelogs/GetChangelog")
+              .setRequestMarshaller(ProtoUtils.marshaller(GetChangelogRequest.getDefaultInstance()))
+              .setResponseMarshaller(ProtoUtils.marshaller(Changelog.getDefaultInstance()))
+              .build();
+
+  private final UnaryCallable<ListChangelogsRequest, ListChangelogsResponse> listChangelogsCallable;
+  private final UnaryCallable<ListChangelogsRequest, ListChangelogsPagedResponse>
+      listChangelogsPagedCallable;
+  private final UnaryCallable<GetChangelogRequest, Changelog> getChangelogCallable;
+
+  private final BackgroundResource backgroundResources;
+  private final GrpcOperationsStub operationsStub;
+  private final GrpcStubCallableFactory callableFactory;
+
+  public static final GrpcChangelogsStub create(ChangelogsStubSettings settings)
+      throws IOException {
+    return new GrpcChangelogsStub(settings, ClientContext.create(settings));
+  }
+
+  public static final GrpcChangelogsStub create(ClientContext clientContext) throws IOException {
+    return new GrpcChangelogsStub(ChangelogsStubSettings.newBuilder().build(), clientContext);
+  }
+
+  public static final GrpcChangelogsStub create(
+      ClientContext clientContext, GrpcStubCallableFactory callableFactory) throws IOException {
+    return new GrpcChangelogsStub(
+        ChangelogsStubSettings.newBuilder().build(), clientContext, callableFactory);
+  }
+
+  /**
+   * Constructs an instance of GrpcChangelogsStub, using the given settings. This is protected so
+   * that it is easy to make a subclass, but otherwise, the static factory methods should be
+   * preferred.
+   */
+  protected GrpcChangelogsStub(ChangelogsStubSettings settings, ClientContext clientContext)
+      throws IOException {
+    this(settings, clientContext, new GrpcChangelogsCallableFactory());
+  }
+
+  /**
+   * Constructs an instance of GrpcChangelogsStub, using the given settings. This is protected so
+   * that it is easy to make a subclass, but otherwise, the static factory methods should be
+   * preferred.
+   */
+  protected GrpcChangelogsStub(
+      ChangelogsStubSettings settings,
+      ClientContext clientContext,
+      GrpcStubCallableFactory callableFactory)
+      throws IOException {
+    this.callableFactory = callableFactory;
+    this.operationsStub = GrpcOperationsStub.create(clientContext, callableFactory);
+
+    GrpcCallSettings<ListChangelogsRequest, ListChangelogsResponse>
+        listChangelogsTransportSettings =
+            GrpcCallSettings.<ListChangelogsRequest, ListChangelogsResponse>newBuilder()
+                .setMethodDescriptor(listChangelogsMethodDescriptor)
+                .setParamsExtractor(
+                    request -> {
+                      ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                      params.put("parent", String.valueOf(request.getParent()));
+                      return params.build();
+                    })
+                .build();
+    GrpcCallSettings<GetChangelogRequest, Changelog> getChangelogTransportSettings =
+        GrpcCallSettings.<GetChangelogRequest, Changelog>newBuilder()
+            .setMethodDescriptor(getChangelogMethodDescriptor)
+            .setParamsExtractor(
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("name", String.valueOf(request.getName()));
+                  return params.build();
+                })
+            .build();
+
+    this.listChangelogsCallable =
+        callableFactory.createUnaryCallable(
+            listChangelogsTransportSettings, settings.listChangelogsSettings(), clientContext);
+    this.listChangelogsPagedCallable =
+        callableFactory.createPagedCallable(
+            listChangelogsTransportSettings, settings.listChangelogsSettings(), clientContext);
+    this.getChangelogCallable =
+        callableFactory.createUnaryCallable(
+            getChangelogTransportSettings, settings.getChangelogSettings(), clientContext);
+
+    this.backgroundResources =
+        new BackgroundResourceAggregation(clientContext.getBackgroundResources());
+  }
+
+  public GrpcOperationsStub getOperationsStub() {
+    return operationsStub;
+  }
+
+  @Override
+  public UnaryCallable<ListChangelogsRequest, ListChangelogsResponse> listChangelogsCallable() {
+    return listChangelogsCallable;
+  }
+
+  @Override
+  public UnaryCallable<ListChangelogsRequest, ListChangelogsPagedResponse>
+      listChangelogsPagedCallable() {
+    return listChangelogsPagedCallable;
+  }
+
+  @Override
+  public UnaryCallable<GetChangelogRequest, Changelog> getChangelogCallable() {
+    return getChangelogCallable;
+  }
+
+  @Override
+  public final void close() {
+    try {
+      backgroundResources.close();
+    } catch (RuntimeException e) {
+      throw e;
+    } catch (Exception e) {
+      throw new IllegalStateException("Failed to close resource", e);
+    }
+  }
+
+  @Override
+  public void shutdown() {
+    backgroundResources.shutdown();
+  }
+
+  @Override
+  public boolean isShutdown() {
+    return backgroundResources.isShutdown();
+  }
+
+  @Override
+  public boolean isTerminated() {
+    return backgroundResources.isTerminated();
+  }
+
+  @Override
+  public void shutdownNow() {
+    backgroundResources.shutdownNow();
+  }
+
+  @Override
+  public boolean awaitTermination(long duration, TimeUnit unit) throws InterruptedException {
+    return backgroundResources.awaitTermination(duration, unit);
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3/ChangelogsClientTest.java b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3/ChangelogsClientTest.java
new file mode 100644
index 000000000..99640438f
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3/ChangelogsClientTest.java
@@ -0,0 +1,259 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3;
+
+import static com.google.cloud.dialogflow.cx.v3.ChangelogsClient.ListChangelogsPagedResponse;
+
+import com.google.api.gax.core.NoCredentialsProvider;
+import com.google.api.gax.grpc.GaxGrpcProperties;
+import com.google.api.gax.grpc.testing.LocalChannelProvider;
+import com.google.api.gax.grpc.testing.MockGrpcService;
+import com.google.api.gax.grpc.testing.MockServiceHelper;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.InvalidArgumentException;
+import com.google.common.collect.Lists;
+import com.google.protobuf.AbstractMessage;
+import com.google.protobuf.Timestamp;
+import io.grpc.StatusRuntimeException;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+import java.util.UUID;
+import javax.annotation.Generated;
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+@Generated("by gapic-generator-java")
+public class ChangelogsClientTest {
+  private static MockChangelogs mockChangelogs;
+  private static MockServiceHelper mockServiceHelper;
+  private LocalChannelProvider channelProvider;
+  private ChangelogsClient client;
+
+  @BeforeClass
+  public static void startStaticServer() {
+    mockChangelogs = new MockChangelogs();
+    mockServiceHelper =
+        new MockServiceHelper(
+            UUID.randomUUID().toString(), Arrays.<MockGrpcService>asList(mockChangelogs));
+    mockServiceHelper.start();
+  }
+
+  @AfterClass
+  public static void stopServer() {
+    mockServiceHelper.stop();
+  }
+
+  @Before
+  public void setUp() throws IOException {
+    mockServiceHelper.reset();
+    channelProvider = mockServiceHelper.createChannelProvider();
+    ChangelogsSettings settings =
+        ChangelogsSettings.newBuilder()
+            .setTransportChannelProvider(channelProvider)
+            .setCredentialsProvider(NoCredentialsProvider.create())
+            .build();
+    client = ChangelogsClient.create(settings);
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    client.close();
+  }
+
+  @Test
+  public void listChangelogsTest() throws Exception {
+    Changelog responsesElement = Changelog.newBuilder().build();
+    ListChangelogsResponse expectedResponse =
+        ListChangelogsResponse.newBuilder()
+            .setNextPageToken("")
+            .addAllChangelogs(Arrays.asList(responsesElement))
+            .build();
+    mockChangelogs.addResponse(expectedResponse);
+
+    AgentName parent = AgentName.of("[PROJECT]", "[LOCATION]", "[AGENT]");
+
+    ListChangelogsPagedResponse pagedListResponse = client.listChangelogs(parent);
+
+    List<Changelog> resources = Lists.newArrayList(pagedListResponse.iterateAll());
+
+    Assert.assertEquals(1, resources.size());
+    Assert.assertEquals(expectedResponse.getChangelogsList().get(0), resources.get(0));
+
+    List<AbstractMessage> actualRequests = mockChangelogs.getRequests();
+    Assert.assertEquals(1, actualRequests.size());
+    ListChangelogsRequest actualRequest = ((ListChangelogsRequest) actualRequests.get(0));
+
+    Assert.assertEquals(parent.toString(), actualRequest.getParent());
+    Assert.assertTrue(
+        channelProvider.isHeaderSent(
+            ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
+            GaxGrpcProperties.getDefaultApiClientHeaderPattern()));
+  }
+
+  @Test
+  public void listChangelogsExceptionTest() throws Exception {
+    StatusRuntimeException exception = new StatusRuntimeException(io.grpc.Status.INVALID_ARGUMENT);
+    mockChangelogs.addException(exception);
+
+    try {
+      AgentName parent = AgentName.of("[PROJECT]", "[LOCATION]", "[AGENT]");
+      client.listChangelogs(parent);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
+
+  @Test
+  public void listChangelogsTest2() throws Exception {
+    Changelog responsesElement = Changelog.newBuilder().build();
+    ListChangelogsResponse expectedResponse =
+        ListChangelogsResponse.newBuilder()
+            .setNextPageToken("")
+            .addAllChangelogs(Arrays.asList(responsesElement))
+            .build();
+    mockChangelogs.addResponse(expectedResponse);
+
+    String parent = "parent-995424086";
+
+    ListChangelogsPagedResponse pagedListResponse = client.listChangelogs(parent);
+
+    List<Changelog> resources = Lists.newArrayList(pagedListResponse.iterateAll());
+
+    Assert.assertEquals(1, resources.size());
+    Assert.assertEquals(expectedResponse.getChangelogsList().get(0), resources.get(0));
+
+    List<AbstractMessage> actualRequests = mockChangelogs.getRequests();
+    Assert.assertEquals(1, actualRequests.size());
+    ListChangelogsRequest actualRequest = ((ListChangelogsRequest) actualRequests.get(0));
+
+    Assert.assertEquals(parent, actualRequest.getParent());
+    Assert.assertTrue(
+        channelProvider.isHeaderSent(
+            ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
+            GaxGrpcProperties.getDefaultApiClientHeaderPattern()));
+  }
+
+  @Test
+  public void listChangelogsExceptionTest2() throws Exception {
+    StatusRuntimeException exception = new StatusRuntimeException(io.grpc.Status.INVALID_ARGUMENT);
+    mockChangelogs.addException(exception);
+
+    try {
+      String parent = "parent-995424086";
+      client.listChangelogs(parent);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
+
+  @Test
+  public void getChangelogTest() throws Exception {
+    Changelog expectedResponse =
+        Changelog.newBuilder()
+            .setName(
+                ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+            .setUserEmail("userEmail315299473")
+            .setDisplayName("displayName1714148973")
+            .setAction("action-1422950858")
+            .setType("type3575610")
+            .setResource("resource-341064690")
+            .setCreateTime(Timestamp.newBuilder().build())
+            .build();
+    mockChangelogs.addResponse(expectedResponse);
+
+    ChangelogName name = ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]");
+
+    Changelog actualResponse = client.getChangelog(name);
+    Assert.assertEquals(expectedResponse, actualResponse);
+
+    List<AbstractMessage> actualRequests = mockChangelogs.getRequests();
+    Assert.assertEquals(1, actualRequests.size());
+    GetChangelogRequest actualRequest = ((GetChangelogRequest) actualRequests.get(0));
+
+    Assert.assertEquals(name.toString(), actualRequest.getName());
+    Assert.assertTrue(
+        channelProvider.isHeaderSent(
+            ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
+            GaxGrpcProperties.getDefaultApiClientHeaderPattern()));
+  }
+
+  @Test
+  public void getChangelogExceptionTest() throws Exception {
+    StatusRuntimeException exception = new StatusRuntimeException(io.grpc.Status.INVALID_ARGUMENT);
+    mockChangelogs.addException(exception);
+
+    try {
+      ChangelogName name = ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]");
+      client.getChangelog(name);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
+
+  @Test
+  public void getChangelogTest2() throws Exception {
+    Changelog expectedResponse =
+        Changelog.newBuilder()
+            .setName(
+                ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+            .setUserEmail("userEmail315299473")
+            .setDisplayName("displayName1714148973")
+            .setAction("action-1422950858")
+            .setType("type3575610")
+            .setResource("resource-341064690")
+            .setCreateTime(Timestamp.newBuilder().build())
+            .build();
+    mockChangelogs.addResponse(expectedResponse);
+
+    String name = "name3373707";
+
+    Changelog actualResponse = client.getChangelog(name);
+    Assert.assertEquals(expectedResponse, actualResponse);
+
+    List<AbstractMessage> actualRequests = mockChangelogs.getRequests();
+    Assert.assertEquals(1, actualRequests.size());
+    GetChangelogRequest actualRequest = ((GetChangelogRequest) actualRequests.get(0));
+
+    Assert.assertEquals(name, actualRequest.getName());
+    Assert.assertTrue(
+        channelProvider.isHeaderSent(
+            ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
+            GaxGrpcProperties.getDefaultApiClientHeaderPattern()));
+  }
+
+  @Test
+  public void getChangelogExceptionTest2() throws Exception {
+    StatusRuntimeException exception = new StatusRuntimeException(io.grpc.Status.INVALID_ARGUMENT);
+    mockChangelogs.addException(exception);
+
+    try {
+      String name = "name3373707";
+      client.getChangelog(name);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3/MockChangelogs.java b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3/MockChangelogs.java
new file mode 100644
index 000000000..192f3cd04
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3/MockChangelogs.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3;
+
+import com.google.api.core.BetaApi;
+import com.google.api.gax.grpc.testing.MockGrpcService;
+import com.google.protobuf.AbstractMessage;
+import io.grpc.ServerServiceDefinition;
+import java.util.List;
+import javax.annotation.Generated;
+
+@BetaApi
+@Generated("by gapic-generator-java")
+public class MockChangelogs implements MockGrpcService {
+  private final MockChangelogsImpl serviceImpl;
+
+  public MockChangelogs() {
+    serviceImpl = new MockChangelogsImpl();
+  }
+
+  @Override
+  public List<AbstractMessage> getRequests() {
+    return serviceImpl.getRequests();
+  }
+
+  @Override
+  public void addResponse(AbstractMessage response) {
+    serviceImpl.addResponse(response);
+  }
+
+  @Override
+  public void addException(Exception exception) {
+    serviceImpl.addException(exception);
+  }
+
+  @Override
+  public ServerServiceDefinition getServiceDefinition() {
+    return serviceImpl.bindService();
+  }
+
+  @Override
+  public void reset() {
+    serviceImpl.reset();
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3/MockChangelogsImpl.java b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3/MockChangelogsImpl.java
new file mode 100644
index 000000000..aaa92402e
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3/MockChangelogsImpl.java
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3;
+
+import com.google.api.core.BetaApi;
+import com.google.cloud.dialogflow.cx.v3.ChangelogsGrpc.ChangelogsImplBase;
+import com.google.protobuf.AbstractMessage;
+import io.grpc.stub.StreamObserver;
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
+import javax.annotation.Generated;
+
+@BetaApi
+@Generated("by gapic-generator-java")
+public class MockChangelogsImpl extends ChangelogsImplBase {
+  private List<AbstractMessage> requests;
+  private Queue<Object> responses;
+
+  public MockChangelogsImpl() {
+    requests = new ArrayList<>();
+    responses = new LinkedList<>();
+  }
+
+  public List<AbstractMessage> getRequests() {
+    return requests;
+  }
+
+  public void addResponse(AbstractMessage response) {
+    responses.add(response);
+  }
+
+  public void setResponses(List<AbstractMessage> responses) {
+    this.responses = new LinkedList<Object>(responses);
+  }
+
+  public void addException(Exception exception) {
+    responses.add(exception);
+  }
+
+  public void reset() {
+    requests = new ArrayList<>();
+    responses = new LinkedList<>();
+  }
+
+  @Override
+  public void listChangelogs(
+      ListChangelogsRequest request, StreamObserver<ListChangelogsResponse> responseObserver) {
+    Object response = responses.poll();
+    if (response instanceof ListChangelogsResponse) {
+      requests.add(request);
+      responseObserver.onNext(((ListChangelogsResponse) response));
+      responseObserver.onCompleted();
+    } else if (response instanceof Exception) {
+      responseObserver.onError(((Exception) response));
+    } else {
+      responseObserver.onError(
+          new IllegalArgumentException(
+              String.format(
+                  "Unrecognized response type %s for method ListChangelogs, expected %s or %s",
+                  response == null ? "null" : response.getClass().getName(),
+                  ListChangelogsResponse.class.getName(),
+                  Exception.class.getName())));
+    }
+  }
+
+  @Override
+  public void getChangelog(
+      GetChangelogRequest request, StreamObserver<Changelog> responseObserver) {
+    Object response = responses.poll();
+    if (response instanceof Changelog) {
+      requests.add(request);
+      responseObserver.onNext(((Changelog) response));
+      responseObserver.onCompleted();
+    } else if (response instanceof Exception) {
+      responseObserver.onError(((Exception) response));
+    } else {
+      responseObserver.onError(
+          new IllegalArgumentException(
+              String.format(
+                  "Unrecognized response type %s for method GetChangelog, expected %s or %s",
+                  response == null ? "null" : response.getClass().getName(),
+                  Changelog.class.getName(),
+                  Exception.class.getName())));
+    }
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsClientTest.java b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsClientTest.java
new file mode 100644
index 000000000..45bd8810a
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsClientTest.java
@@ -0,0 +1,259 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+import static com.google.cloud.dialogflow.cx.v3beta1.ChangelogsClient.ListChangelogsPagedResponse;
+
+import com.google.api.gax.core.NoCredentialsProvider;
+import com.google.api.gax.grpc.GaxGrpcProperties;
+import com.google.api.gax.grpc.testing.LocalChannelProvider;
+import com.google.api.gax.grpc.testing.MockGrpcService;
+import com.google.api.gax.grpc.testing.MockServiceHelper;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.InvalidArgumentException;
+import com.google.common.collect.Lists;
+import com.google.protobuf.AbstractMessage;
+import com.google.protobuf.Timestamp;
+import io.grpc.StatusRuntimeException;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+import java.util.UUID;
+import javax.annotation.Generated;
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+@Generated("by gapic-generator-java")
+public class ChangelogsClientTest {
+  private static MockChangelogs mockChangelogs;
+  private static MockServiceHelper mockServiceHelper;
+  private LocalChannelProvider channelProvider;
+  private ChangelogsClient client;
+
+  @BeforeClass
+  public static void startStaticServer() {
+    mockChangelogs = new MockChangelogs();
+    mockServiceHelper =
+        new MockServiceHelper(
+            UUID.randomUUID().toString(), Arrays.<MockGrpcService>asList(mockChangelogs));
+    mockServiceHelper.start();
+  }
+
+  @AfterClass
+  public static void stopServer() {
+    mockServiceHelper.stop();
+  }
+
+  @Before
+  public void setUp() throws IOException {
+    mockServiceHelper.reset();
+    channelProvider = mockServiceHelper.createChannelProvider();
+    ChangelogsSettings settings =
+        ChangelogsSettings.newBuilder()
+            .setTransportChannelProvider(channelProvider)
+            .setCredentialsProvider(NoCredentialsProvider.create())
+            .build();
+    client = ChangelogsClient.create(settings);
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    client.close();
+  }
+
+  @Test
+  public void listChangelogsTest() throws Exception {
+    Changelog responsesElement = Changelog.newBuilder().build();
+    ListChangelogsResponse expectedResponse =
+        ListChangelogsResponse.newBuilder()
+            .setNextPageToken("")
+            .addAllChangelogs(Arrays.asList(responsesElement))
+            .build();
+    mockChangelogs.addResponse(expectedResponse);
+
+    AgentName parent = AgentName.of("[PROJECT]", "[LOCATION]", "[AGENT]");
+
+    ListChangelogsPagedResponse pagedListResponse = client.listChangelogs(parent);
+
+    List<Changelog> resources = Lists.newArrayList(pagedListResponse.iterateAll());
+
+    Assert.assertEquals(1, resources.size());
+    Assert.assertEquals(expectedResponse.getChangelogsList().get(0), resources.get(0));
+
+    List<AbstractMessage> actualRequests = mockChangelogs.getRequests();
+    Assert.assertEquals(1, actualRequests.size());
+    ListChangelogsRequest actualRequest = ((ListChangelogsRequest) actualRequests.get(0));
+
+    Assert.assertEquals(parent.toString(), actualRequest.getParent());
+    Assert.assertTrue(
+        channelProvider.isHeaderSent(
+            ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
+            GaxGrpcProperties.getDefaultApiClientHeaderPattern()));
+  }
+
+  @Test
+  public void listChangelogsExceptionTest() throws Exception {
+    StatusRuntimeException exception = new StatusRuntimeException(io.grpc.Status.INVALID_ARGUMENT);
+    mockChangelogs.addException(exception);
+
+    try {
+      AgentName parent = AgentName.of("[PROJECT]", "[LOCATION]", "[AGENT]");
+      client.listChangelogs(parent);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
+
+  @Test
+  public void listChangelogsTest2() throws Exception {
+    Changelog responsesElement = Changelog.newBuilder().build();
+    ListChangelogsResponse expectedResponse =
+        ListChangelogsResponse.newBuilder()
+            .setNextPageToken("")
+            .addAllChangelogs(Arrays.asList(responsesElement))
+            .build();
+    mockChangelogs.addResponse(expectedResponse);
+
+    String parent = "parent-995424086";
+
+    ListChangelogsPagedResponse pagedListResponse = client.listChangelogs(parent);
+
+    List<Changelog> resources = Lists.newArrayList(pagedListResponse.iterateAll());
+
+    Assert.assertEquals(1, resources.size());
+    Assert.assertEquals(expectedResponse.getChangelogsList().get(0), resources.get(0));
+
+    List<AbstractMessage> actualRequests = mockChangelogs.getRequests();
+    Assert.assertEquals(1, actualRequests.size());
+    ListChangelogsRequest actualRequest = ((ListChangelogsRequest) actualRequests.get(0));
+
+    Assert.assertEquals(parent, actualRequest.getParent());
+    Assert.assertTrue(
+        channelProvider.isHeaderSent(
+            ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
+            GaxGrpcProperties.getDefaultApiClientHeaderPattern()));
+  }
+
+  @Test
+  public void listChangelogsExceptionTest2() throws Exception {
+    StatusRuntimeException exception = new StatusRuntimeException(io.grpc.Status.INVALID_ARGUMENT);
+    mockChangelogs.addException(exception);
+
+    try {
+      String parent = "parent-995424086";
+      client.listChangelogs(parent);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
+
+  @Test
+  public void getChangelogTest() throws Exception {
+    Changelog expectedResponse =
+        Changelog.newBuilder()
+            .setName(
+                ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+            .setUserEmail("userEmail315299473")
+            .setDisplayName("displayName1714148973")
+            .setAction("action-1422950858")
+            .setType("type3575610")
+            .setResource("resource-341064690")
+            .setCreateTime(Timestamp.newBuilder().build())
+            .build();
+    mockChangelogs.addResponse(expectedResponse);
+
+    ChangelogName name = ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]");
+
+    Changelog actualResponse = client.getChangelog(name);
+    Assert.assertEquals(expectedResponse, actualResponse);
+
+    List<AbstractMessage> actualRequests = mockChangelogs.getRequests();
+    Assert.assertEquals(1, actualRequests.size());
+    GetChangelogRequest actualRequest = ((GetChangelogRequest) actualRequests.get(0));
+
+    Assert.assertEquals(name.toString(), actualRequest.getName());
+    Assert.assertTrue(
+        channelProvider.isHeaderSent(
+            ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
+            GaxGrpcProperties.getDefaultApiClientHeaderPattern()));
+  }
+
+  @Test
+  public void getChangelogExceptionTest() throws Exception {
+    StatusRuntimeException exception = new StatusRuntimeException(io.grpc.Status.INVALID_ARGUMENT);
+    mockChangelogs.addException(exception);
+
+    try {
+      ChangelogName name = ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]");
+      client.getChangelog(name);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
+
+  @Test
+  public void getChangelogTest2() throws Exception {
+    Changelog expectedResponse =
+        Changelog.newBuilder()
+            .setName(
+                ChangelogName.of("[PROJECT]", "[LOCATION]", "[AGENT]", "[CHANGELOG]").toString())
+            .setUserEmail("userEmail315299473")
+            .setDisplayName("displayName1714148973")
+            .setAction("action-1422950858")
+            .setType("type3575610")
+            .setResource("resource-341064690")
+            .setCreateTime(Timestamp.newBuilder().build())
+            .build();
+    mockChangelogs.addResponse(expectedResponse);
+
+    String name = "name3373707";
+
+    Changelog actualResponse = client.getChangelog(name);
+    Assert.assertEquals(expectedResponse, actualResponse);
+
+    List<AbstractMessage> actualRequests = mockChangelogs.getRequests();
+    Assert.assertEquals(1, actualRequests.size());
+    GetChangelogRequest actualRequest = ((GetChangelogRequest) actualRequests.get(0));
+
+    Assert.assertEquals(name, actualRequest.getName());
+    Assert.assertTrue(
+        channelProvider.isHeaderSent(
+            ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
+            GaxGrpcProperties.getDefaultApiClientHeaderPattern()));
+  }
+
+  @Test
+  public void getChangelogExceptionTest2() throws Exception {
+    StatusRuntimeException exception = new StatusRuntimeException(io.grpc.Status.INVALID_ARGUMENT);
+    mockChangelogs.addException(exception);
+
+    try {
+      String name = "name3373707";
+      client.getChangelog(name);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3beta1/MockChangelogs.java b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3beta1/MockChangelogs.java
new file mode 100644
index 000000000..06692b297
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3beta1/MockChangelogs.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+import com.google.api.core.BetaApi;
+import com.google.api.gax.grpc.testing.MockGrpcService;
+import com.google.protobuf.AbstractMessage;
+import io.grpc.ServerServiceDefinition;
+import java.util.List;
+import javax.annotation.Generated;
+
+@BetaApi
+@Generated("by gapic-generator-java")
+public class MockChangelogs implements MockGrpcService {
+  private final MockChangelogsImpl serviceImpl;
+
+  public MockChangelogs() {
+    serviceImpl = new MockChangelogsImpl();
+  }
+
+  @Override
+  public List<AbstractMessage> getRequests() {
+    return serviceImpl.getRequests();
+  }
+
+  @Override
+  public void addResponse(AbstractMessage response) {
+    serviceImpl.addResponse(response);
+  }
+
+  @Override
+  public void addException(Exception exception) {
+    serviceImpl.addException(exception);
+  }
+
+  @Override
+  public ServerServiceDefinition getServiceDefinition() {
+    return serviceImpl.bindService();
+  }
+
+  @Override
+  public void reset() {
+    serviceImpl.reset();
+  }
+}
diff --git a/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3beta1/MockChangelogsImpl.java b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3beta1/MockChangelogsImpl.java
new file mode 100644
index 000000000..ee5118ee1
--- /dev/null
+++ b/google-cloud-dialogflow-cx/src/test/java/com/google/cloud/dialogflow/cx/v3beta1/MockChangelogsImpl.java
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+import com.google.api.core.BetaApi;
+import com.google.cloud.dialogflow.cx.v3beta1.ChangelogsGrpc.ChangelogsImplBase;
+import com.google.protobuf.AbstractMessage;
+import io.grpc.stub.StreamObserver;
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
+import javax.annotation.Generated;
+
+@BetaApi
+@Generated("by gapic-generator-java")
+public class MockChangelogsImpl extends ChangelogsImplBase {
+  private List<AbstractMessage> requests;
+  private Queue<Object> responses;
+
+  public MockChangelogsImpl() {
+    requests = new ArrayList<>();
+    responses = new LinkedList<>();
+  }
+
+  public List<AbstractMessage> getRequests() {
+    return requests;
+  }
+
+  public void addResponse(AbstractMessage response) {
+    responses.add(response);
+  }
+
+  public void setResponses(List<AbstractMessage> responses) {
+    this.responses = new LinkedList<Object>(responses);
+  }
+
+  public void addException(Exception exception) {
+    responses.add(exception);
+  }
+
+  public void reset() {
+    requests = new ArrayList<>();
+    responses = new LinkedList<>();
+  }
+
+  @Override
+  public void listChangelogs(
+      ListChangelogsRequest request, StreamObserver<ListChangelogsResponse> responseObserver) {
+    Object response = responses.poll();
+    if (response instanceof ListChangelogsResponse) {
+      requests.add(request);
+      responseObserver.onNext(((ListChangelogsResponse) response));
+      responseObserver.onCompleted();
+    } else if (response instanceof Exception) {
+      responseObserver.onError(((Exception) response));
+    } else {
+      responseObserver.onError(
+          new IllegalArgumentException(
+              String.format(
+                  "Unrecognized response type %s for method ListChangelogs, expected %s or %s",
+                  response == null ? "null" : response.getClass().getName(),
+                  ListChangelogsResponse.class.getName(),
+                  Exception.class.getName())));
+    }
+  }
+
+  @Override
+  public void getChangelog(
+      GetChangelogRequest request, StreamObserver<Changelog> responseObserver) {
+    Object response = responses.poll();
+    if (response instanceof Changelog) {
+      requests.add(request);
+      responseObserver.onNext(((Changelog) response));
+      responseObserver.onCompleted();
+    } else if (response instanceof Exception) {
+      responseObserver.onError(((Exception) response));
+    } else {
+      responseObserver.onError(
+          new IllegalArgumentException(
+              String.format(
+                  "Unrecognized response type %s for method GetChangelog, expected %s or %s",
+                  response == null ? "null" : response.getClass().getName(),
+                  Changelog.class.getName(),
+                  Exception.class.getName())));
+    }
+  }
+}
diff --git a/grpc-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogsGrpc.java b/grpc-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogsGrpc.java
new file mode 100644
index 000000000..cdddfe55f
--- /dev/null
+++ b/grpc-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogsGrpc.java
@@ -0,0 +1,475 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.cloud.dialogflow.cx.v3;
+
+import static io.grpc.MethodDescriptor.generateFullMethodName;
+
+/**
+ *
+ *
+ * <pre>
+ * Service for managing [Changelogs][google.cloud.dialogflow.cx.v3.Changelog].
+ * </pre>
+ */
+@javax.annotation.Generated(
+    value = "by gRPC proto compiler",
+    comments = "Source: google/cloud/dialogflow/cx/v3/changelog.proto")
+public final class ChangelogsGrpc {
+
+  private ChangelogsGrpc() {}
+
+  public static final String SERVICE_NAME = "google.cloud.dialogflow.cx.v3.Changelogs";
+
+  // Static method descriptors that strictly reflect the proto.
+  private static volatile io.grpc.MethodDescriptor<
+          com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest,
+          com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse>
+      getListChangelogsMethod;
+
+  @io.grpc.stub.annotations.RpcMethod(
+      fullMethodName = SERVICE_NAME + '/' + "ListChangelogs",
+      requestType = com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest.class,
+      responseType = com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse.class,
+      methodType = io.grpc.MethodDescriptor.MethodType.UNARY)
+  public static io.grpc.MethodDescriptor<
+          com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest,
+          com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse>
+      getListChangelogsMethod() {
+    io.grpc.MethodDescriptor<
+            com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest,
+            com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse>
+        getListChangelogsMethod;
+    if ((getListChangelogsMethod = ChangelogsGrpc.getListChangelogsMethod) == null) {
+      synchronized (ChangelogsGrpc.class) {
+        if ((getListChangelogsMethod = ChangelogsGrpc.getListChangelogsMethod) == null) {
+          ChangelogsGrpc.getListChangelogsMethod =
+              getListChangelogsMethod =
+                  io.grpc.MethodDescriptor
+                      .<com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest,
+                          com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse>
+                          newBuilder()
+                      .setType(io.grpc.MethodDescriptor.MethodType.UNARY)
+                      .setFullMethodName(generateFullMethodName(SERVICE_NAME, "ListChangelogs"))
+                      .setSampledToLocalTracing(true)
+                      .setRequestMarshaller(
+                          io.grpc.protobuf.ProtoUtils.marshaller(
+                              com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest
+                                  .getDefaultInstance()))
+                      .setResponseMarshaller(
+                          io.grpc.protobuf.ProtoUtils.marshaller(
+                              com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse
+                                  .getDefaultInstance()))
+                      .setSchemaDescriptor(new ChangelogsMethodDescriptorSupplier("ListChangelogs"))
+                      .build();
+        }
+      }
+    }
+    return getListChangelogsMethod;
+  }
+
+  private static volatile io.grpc.MethodDescriptor<
+          com.google.cloud.dialogflow.cx.v3.GetChangelogRequest,
+          com.google.cloud.dialogflow.cx.v3.Changelog>
+      getGetChangelogMethod;
+
+  @io.grpc.stub.annotations.RpcMethod(
+      fullMethodName = SERVICE_NAME + '/' + "GetChangelog",
+      requestType = com.google.cloud.dialogflow.cx.v3.GetChangelogRequest.class,
+      responseType = com.google.cloud.dialogflow.cx.v3.Changelog.class,
+      methodType = io.grpc.MethodDescriptor.MethodType.UNARY)
+  public static io.grpc.MethodDescriptor<
+          com.google.cloud.dialogflow.cx.v3.GetChangelogRequest,
+          com.google.cloud.dialogflow.cx.v3.Changelog>
+      getGetChangelogMethod() {
+    io.grpc.MethodDescriptor<
+            com.google.cloud.dialogflow.cx.v3.GetChangelogRequest,
+            com.google.cloud.dialogflow.cx.v3.Changelog>
+        getGetChangelogMethod;
+    if ((getGetChangelogMethod = ChangelogsGrpc.getGetChangelogMethod) == null) {
+      synchronized (ChangelogsGrpc.class) {
+        if ((getGetChangelogMethod = ChangelogsGrpc.getGetChangelogMethod) == null) {
+          ChangelogsGrpc.getGetChangelogMethod =
+              getGetChangelogMethod =
+                  io.grpc.MethodDescriptor
+                      .<com.google.cloud.dialogflow.cx.v3.GetChangelogRequest,
+                          com.google.cloud.dialogflow.cx.v3.Changelog>
+                          newBuilder()
+                      .setType(io.grpc.MethodDescriptor.MethodType.UNARY)
+                      .setFullMethodName(generateFullMethodName(SERVICE_NAME, "GetChangelog"))
+                      .setSampledToLocalTracing(true)
+                      .setRequestMarshaller(
+                          io.grpc.protobuf.ProtoUtils.marshaller(
+                              com.google.cloud.dialogflow.cx.v3.GetChangelogRequest
+                                  .getDefaultInstance()))
+                      .setResponseMarshaller(
+                          io.grpc.protobuf.ProtoUtils.marshaller(
+                              com.google.cloud.dialogflow.cx.v3.Changelog.getDefaultInstance()))
+                      .setSchemaDescriptor(new ChangelogsMethodDescriptorSupplier("GetChangelog"))
+                      .build();
+        }
+      }
+    }
+    return getGetChangelogMethod;
+  }
+
+  /** Creates a new async stub that supports all call types for the service */
+  public static ChangelogsStub newStub(io.grpc.Channel channel) {
+    io.grpc.stub.AbstractStub.StubFactory<ChangelogsStub> factory =
+        new io.grpc.stub.AbstractStub.StubFactory<ChangelogsStub>() {
+          @java.lang.Override
+          public ChangelogsStub newStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+            return new ChangelogsStub(channel, callOptions);
+          }
+        };
+    return ChangelogsStub.newStub(factory, channel);
+  }
+
+  /**
+   * Creates a new blocking-style stub that supports unary and streaming output calls on the service
+   */
+  public static ChangelogsBlockingStub newBlockingStub(io.grpc.Channel channel) {
+    io.grpc.stub.AbstractStub.StubFactory<ChangelogsBlockingStub> factory =
+        new io.grpc.stub.AbstractStub.StubFactory<ChangelogsBlockingStub>() {
+          @java.lang.Override
+          public ChangelogsBlockingStub newStub(
+              io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+            return new ChangelogsBlockingStub(channel, callOptions);
+          }
+        };
+    return ChangelogsBlockingStub.newStub(factory, channel);
+  }
+
+  /** Creates a new ListenableFuture-style stub that supports unary calls on the service */
+  public static ChangelogsFutureStub newFutureStub(io.grpc.Channel channel) {
+    io.grpc.stub.AbstractStub.StubFactory<ChangelogsFutureStub> factory =
+        new io.grpc.stub.AbstractStub.StubFactory<ChangelogsFutureStub>() {
+          @java.lang.Override
+          public ChangelogsFutureStub newStub(
+              io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+            return new ChangelogsFutureStub(channel, callOptions);
+          }
+        };
+    return ChangelogsFutureStub.newStub(factory, channel);
+  }
+
+  /**
+   *
+   *
+   * <pre>
+   * Service for managing [Changelogs][google.cloud.dialogflow.cx.v3.Changelog].
+   * </pre>
+   */
+  public abstract static class ChangelogsImplBase implements io.grpc.BindableService {
+
+    /**
+     *
+     *
+     * <pre>
+     * Returns the list of Changelogs.
+     * </pre>
+     */
+    public void listChangelogs(
+        com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest request,
+        io.grpc.stub.StreamObserver<com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse>
+            responseObserver) {
+      io.grpc.stub.ServerCalls.asyncUnimplementedUnaryCall(
+          getListChangelogsMethod(), responseObserver);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Retrieves the specified Changelog.
+     * </pre>
+     */
+    public void getChangelog(
+        com.google.cloud.dialogflow.cx.v3.GetChangelogRequest request,
+        io.grpc.stub.StreamObserver<com.google.cloud.dialogflow.cx.v3.Changelog> responseObserver) {
+      io.grpc.stub.ServerCalls.asyncUnimplementedUnaryCall(
+          getGetChangelogMethod(), responseObserver);
+    }
+
+    @java.lang.Override
+    public final io.grpc.ServerServiceDefinition bindService() {
+      return io.grpc.ServerServiceDefinition.builder(getServiceDescriptor())
+          .addMethod(
+              getListChangelogsMethod(),
+              io.grpc.stub.ServerCalls.asyncUnaryCall(
+                  new MethodHandlers<
+                      com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest,
+                      com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse>(
+                      this, METHODID_LIST_CHANGELOGS)))
+          .addMethod(
+              getGetChangelogMethod(),
+              io.grpc.stub.ServerCalls.asyncUnaryCall(
+                  new MethodHandlers<
+                      com.google.cloud.dialogflow.cx.v3.GetChangelogRequest,
+                      com.google.cloud.dialogflow.cx.v3.Changelog>(this, METHODID_GET_CHANGELOG)))
+          .build();
+    }
+  }
+
+  /**
+   *
+   *
+   * <pre>
+   * Service for managing [Changelogs][google.cloud.dialogflow.cx.v3.Changelog].
+   * </pre>
+   */
+  public static final class ChangelogsStub extends io.grpc.stub.AbstractAsyncStub<ChangelogsStub> {
+    private ChangelogsStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      super(channel, callOptions);
+    }
+
+    @java.lang.Override
+    protected ChangelogsStub build(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      return new ChangelogsStub(channel, callOptions);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Returns the list of Changelogs.
+     * </pre>
+     */
+    public void listChangelogs(
+        com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest request,
+        io.grpc.stub.StreamObserver<com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse>
+            responseObserver) {
+      io.grpc.stub.ClientCalls.asyncUnaryCall(
+          getChannel().newCall(getListChangelogsMethod(), getCallOptions()),
+          request,
+          responseObserver);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Retrieves the specified Changelog.
+     * </pre>
+     */
+    public void getChangelog(
+        com.google.cloud.dialogflow.cx.v3.GetChangelogRequest request,
+        io.grpc.stub.StreamObserver<com.google.cloud.dialogflow.cx.v3.Changelog> responseObserver) {
+      io.grpc.stub.ClientCalls.asyncUnaryCall(
+          getChannel().newCall(getGetChangelogMethod(), getCallOptions()),
+          request,
+          responseObserver);
+    }
+  }
+
+  /**
+   *
+   *
+   * <pre>
+   * Service for managing [Changelogs][google.cloud.dialogflow.cx.v3.Changelog].
+   * </pre>
+   */
+  public static final class ChangelogsBlockingStub
+      extends io.grpc.stub.AbstractBlockingStub<ChangelogsBlockingStub> {
+    private ChangelogsBlockingStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      super(channel, callOptions);
+    }
+
+    @java.lang.Override
+    protected ChangelogsBlockingStub build(
+        io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      return new ChangelogsBlockingStub(channel, callOptions);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Returns the list of Changelogs.
+     * </pre>
+     */
+    public com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse listChangelogs(
+        com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest request) {
+      return io.grpc.stub.ClientCalls.blockingUnaryCall(
+          getChannel(), getListChangelogsMethod(), getCallOptions(), request);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Retrieves the specified Changelog.
+     * </pre>
+     */
+    public com.google.cloud.dialogflow.cx.v3.Changelog getChangelog(
+        com.google.cloud.dialogflow.cx.v3.GetChangelogRequest request) {
+      return io.grpc.stub.ClientCalls.blockingUnaryCall(
+          getChannel(), getGetChangelogMethod(), getCallOptions(), request);
+    }
+  }
+
+  /**
+   *
+   *
+   * <pre>
+   * Service for managing [Changelogs][google.cloud.dialogflow.cx.v3.Changelog].
+   * </pre>
+   */
+  public static final class ChangelogsFutureStub
+      extends io.grpc.stub.AbstractFutureStub<ChangelogsFutureStub> {
+    private ChangelogsFutureStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      super(channel, callOptions);
+    }
+
+    @java.lang.Override
+    protected ChangelogsFutureStub build(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      return new ChangelogsFutureStub(channel, callOptions);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Returns the list of Changelogs.
+     * </pre>
+     */
+    public com.google.common.util.concurrent.ListenableFuture<
+            com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse>
+        listChangelogs(com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest request) {
+      return io.grpc.stub.ClientCalls.futureUnaryCall(
+          getChannel().newCall(getListChangelogsMethod(), getCallOptions()), request);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Retrieves the specified Changelog.
+     * </pre>
+     */
+    public com.google.common.util.concurrent.ListenableFuture<
+            com.google.cloud.dialogflow.cx.v3.Changelog>
+        getChangelog(com.google.cloud.dialogflow.cx.v3.GetChangelogRequest request) {
+      return io.grpc.stub.ClientCalls.futureUnaryCall(
+          getChannel().newCall(getGetChangelogMethod(), getCallOptions()), request);
+    }
+  }
+
+  private static final int METHODID_LIST_CHANGELOGS = 0;
+  private static final int METHODID_GET_CHANGELOG = 1;
+
+  private static final class MethodHandlers<Req, Resp>
+      implements io.grpc.stub.ServerCalls.UnaryMethod<Req, Resp>,
+          io.grpc.stub.ServerCalls.ServerStreamingMethod<Req, Resp>,
+          io.grpc.stub.ServerCalls.ClientStreamingMethod<Req, Resp>,
+          io.grpc.stub.ServerCalls.BidiStreamingMethod<Req, Resp> {
+    private final ChangelogsImplBase serviceImpl;
+    private final int methodId;
+
+    MethodHandlers(ChangelogsImplBase serviceImpl, int methodId) {
+      this.serviceImpl = serviceImpl;
+      this.methodId = methodId;
+    }
+
+    @java.lang.Override
+    @java.lang.SuppressWarnings("unchecked")
+    public void invoke(Req request, io.grpc.stub.StreamObserver<Resp> responseObserver) {
+      switch (methodId) {
+        case METHODID_LIST_CHANGELOGS:
+          serviceImpl.listChangelogs(
+              (com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest) request,
+              (io.grpc.stub.StreamObserver<
+                      com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse>)
+                  responseObserver);
+          break;
+        case METHODID_GET_CHANGELOG:
+          serviceImpl.getChangelog(
+              (com.google.cloud.dialogflow.cx.v3.GetChangelogRequest) request,
+              (io.grpc.stub.StreamObserver<com.google.cloud.dialogflow.cx.v3.Changelog>)
+                  responseObserver);
+          break;
+        default:
+          throw new AssertionError();
+      }
+    }
+
+    @java.lang.Override
+    @java.lang.SuppressWarnings("unchecked")
+    public io.grpc.stub.StreamObserver<Req> invoke(
+        io.grpc.stub.StreamObserver<Resp> responseObserver) {
+      switch (methodId) {
+        default:
+          throw new AssertionError();
+      }
+    }
+  }
+
+  private abstract static class ChangelogsBaseDescriptorSupplier
+      implements io.grpc.protobuf.ProtoFileDescriptorSupplier,
+          io.grpc.protobuf.ProtoServiceDescriptorSupplier {
+    ChangelogsBaseDescriptorSupplier() {}
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.FileDescriptor getFileDescriptor() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto.getDescriptor();
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.ServiceDescriptor getServiceDescriptor() {
+      return getFileDescriptor().findServiceByName("Changelogs");
+    }
+  }
+
+  private static final class ChangelogsFileDescriptorSupplier
+      extends ChangelogsBaseDescriptorSupplier {
+    ChangelogsFileDescriptorSupplier() {}
+  }
+
+  private static final class ChangelogsMethodDescriptorSupplier
+      extends ChangelogsBaseDescriptorSupplier
+      implements io.grpc.protobuf.ProtoMethodDescriptorSupplier {
+    private final String methodName;
+
+    ChangelogsMethodDescriptorSupplier(String methodName) {
+      this.methodName = methodName;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.MethodDescriptor getMethodDescriptor() {
+      return getServiceDescriptor().findMethodByName(methodName);
+    }
+  }
+
+  private static volatile io.grpc.ServiceDescriptor serviceDescriptor;
+
+  public static io.grpc.ServiceDescriptor getServiceDescriptor() {
+    io.grpc.ServiceDescriptor result = serviceDescriptor;
+    if (result == null) {
+      synchronized (ChangelogsGrpc.class) {
+        result = serviceDescriptor;
+        if (result == null) {
+          serviceDescriptor =
+              result =
+                  io.grpc.ServiceDescriptor.newBuilder(SERVICE_NAME)
+                      .setSchemaDescriptor(new ChangelogsFileDescriptorSupplier())
+                      .addMethod(getListChangelogsMethod())
+                      .addMethod(getGetChangelogMethod())
+                      .build();
+        }
+      }
+    }
+    return result;
+  }
+}
diff --git a/grpc-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsGrpc.java b/grpc-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsGrpc.java
new file mode 100644
index 000000000..474adf359
--- /dev/null
+++ b/grpc-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogsGrpc.java
@@ -0,0 +1,479 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+import static io.grpc.MethodDescriptor.generateFullMethodName;
+
+/**
+ *
+ *
+ * <pre>
+ * Service for managing [Changelogs][google.cloud.dialogflow.cx.v3beta1.Changelog].
+ * </pre>
+ */
+@javax.annotation.Generated(
+    value = "by gRPC proto compiler",
+    comments = "Source: google/cloud/dialogflow/cx/v3beta1/changelog.proto")
+public final class ChangelogsGrpc {
+
+  private ChangelogsGrpc() {}
+
+  public static final String SERVICE_NAME = "google.cloud.dialogflow.cx.v3beta1.Changelogs";
+
+  // Static method descriptors that strictly reflect the proto.
+  private static volatile io.grpc.MethodDescriptor<
+          com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest,
+          com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse>
+      getListChangelogsMethod;
+
+  @io.grpc.stub.annotations.RpcMethod(
+      fullMethodName = SERVICE_NAME + '/' + "ListChangelogs",
+      requestType = com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest.class,
+      responseType = com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse.class,
+      methodType = io.grpc.MethodDescriptor.MethodType.UNARY)
+  public static io.grpc.MethodDescriptor<
+          com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest,
+          com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse>
+      getListChangelogsMethod() {
+    io.grpc.MethodDescriptor<
+            com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest,
+            com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse>
+        getListChangelogsMethod;
+    if ((getListChangelogsMethod = ChangelogsGrpc.getListChangelogsMethod) == null) {
+      synchronized (ChangelogsGrpc.class) {
+        if ((getListChangelogsMethod = ChangelogsGrpc.getListChangelogsMethod) == null) {
+          ChangelogsGrpc.getListChangelogsMethod =
+              getListChangelogsMethod =
+                  io.grpc.MethodDescriptor
+                      .<com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest,
+                          com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse>
+                          newBuilder()
+                      .setType(io.grpc.MethodDescriptor.MethodType.UNARY)
+                      .setFullMethodName(generateFullMethodName(SERVICE_NAME, "ListChangelogs"))
+                      .setSampledToLocalTracing(true)
+                      .setRequestMarshaller(
+                          io.grpc.protobuf.ProtoUtils.marshaller(
+                              com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest
+                                  .getDefaultInstance()))
+                      .setResponseMarshaller(
+                          io.grpc.protobuf.ProtoUtils.marshaller(
+                              com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse
+                                  .getDefaultInstance()))
+                      .setSchemaDescriptor(new ChangelogsMethodDescriptorSupplier("ListChangelogs"))
+                      .build();
+        }
+      }
+    }
+    return getListChangelogsMethod;
+  }
+
+  private static volatile io.grpc.MethodDescriptor<
+          com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest,
+          com.google.cloud.dialogflow.cx.v3beta1.Changelog>
+      getGetChangelogMethod;
+
+  @io.grpc.stub.annotations.RpcMethod(
+      fullMethodName = SERVICE_NAME + '/' + "GetChangelog",
+      requestType = com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest.class,
+      responseType = com.google.cloud.dialogflow.cx.v3beta1.Changelog.class,
+      methodType = io.grpc.MethodDescriptor.MethodType.UNARY)
+  public static io.grpc.MethodDescriptor<
+          com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest,
+          com.google.cloud.dialogflow.cx.v3beta1.Changelog>
+      getGetChangelogMethod() {
+    io.grpc.MethodDescriptor<
+            com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest,
+            com.google.cloud.dialogflow.cx.v3beta1.Changelog>
+        getGetChangelogMethod;
+    if ((getGetChangelogMethod = ChangelogsGrpc.getGetChangelogMethod) == null) {
+      synchronized (ChangelogsGrpc.class) {
+        if ((getGetChangelogMethod = ChangelogsGrpc.getGetChangelogMethod) == null) {
+          ChangelogsGrpc.getGetChangelogMethod =
+              getGetChangelogMethod =
+                  io.grpc.MethodDescriptor
+                      .<com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest,
+                          com.google.cloud.dialogflow.cx.v3beta1.Changelog>
+                          newBuilder()
+                      .setType(io.grpc.MethodDescriptor.MethodType.UNARY)
+                      .setFullMethodName(generateFullMethodName(SERVICE_NAME, "GetChangelog"))
+                      .setSampledToLocalTracing(true)
+                      .setRequestMarshaller(
+                          io.grpc.protobuf.ProtoUtils.marshaller(
+                              com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest
+                                  .getDefaultInstance()))
+                      .setResponseMarshaller(
+                          io.grpc.protobuf.ProtoUtils.marshaller(
+                              com.google.cloud.dialogflow.cx.v3beta1.Changelog
+                                  .getDefaultInstance()))
+                      .setSchemaDescriptor(new ChangelogsMethodDescriptorSupplier("GetChangelog"))
+                      .build();
+        }
+      }
+    }
+    return getGetChangelogMethod;
+  }
+
+  /** Creates a new async stub that supports all call types for the service */
+  public static ChangelogsStub newStub(io.grpc.Channel channel) {
+    io.grpc.stub.AbstractStub.StubFactory<ChangelogsStub> factory =
+        new io.grpc.stub.AbstractStub.StubFactory<ChangelogsStub>() {
+          @java.lang.Override
+          public ChangelogsStub newStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+            return new ChangelogsStub(channel, callOptions);
+          }
+        };
+    return ChangelogsStub.newStub(factory, channel);
+  }
+
+  /**
+   * Creates a new blocking-style stub that supports unary and streaming output calls on the service
+   */
+  public static ChangelogsBlockingStub newBlockingStub(io.grpc.Channel channel) {
+    io.grpc.stub.AbstractStub.StubFactory<ChangelogsBlockingStub> factory =
+        new io.grpc.stub.AbstractStub.StubFactory<ChangelogsBlockingStub>() {
+          @java.lang.Override
+          public ChangelogsBlockingStub newStub(
+              io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+            return new ChangelogsBlockingStub(channel, callOptions);
+          }
+        };
+    return ChangelogsBlockingStub.newStub(factory, channel);
+  }
+
+  /** Creates a new ListenableFuture-style stub that supports unary calls on the service */
+  public static ChangelogsFutureStub newFutureStub(io.grpc.Channel channel) {
+    io.grpc.stub.AbstractStub.StubFactory<ChangelogsFutureStub> factory =
+        new io.grpc.stub.AbstractStub.StubFactory<ChangelogsFutureStub>() {
+          @java.lang.Override
+          public ChangelogsFutureStub newStub(
+              io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+            return new ChangelogsFutureStub(channel, callOptions);
+          }
+        };
+    return ChangelogsFutureStub.newStub(factory, channel);
+  }
+
+  /**
+   *
+   *
+   * <pre>
+   * Service for managing [Changelogs][google.cloud.dialogflow.cx.v3beta1.Changelog].
+   * </pre>
+   */
+  public abstract static class ChangelogsImplBase implements io.grpc.BindableService {
+
+    /**
+     *
+     *
+     * <pre>
+     * Returns the list of Changelogs.
+     * </pre>
+     */
+    public void listChangelogs(
+        com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest request,
+        io.grpc.stub.StreamObserver<com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse>
+            responseObserver) {
+      io.grpc.stub.ServerCalls.asyncUnimplementedUnaryCall(
+          getListChangelogsMethod(), responseObserver);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Retrieves the specified Changelog.
+     * </pre>
+     */
+    public void getChangelog(
+        com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest request,
+        io.grpc.stub.StreamObserver<com.google.cloud.dialogflow.cx.v3beta1.Changelog>
+            responseObserver) {
+      io.grpc.stub.ServerCalls.asyncUnimplementedUnaryCall(
+          getGetChangelogMethod(), responseObserver);
+    }
+
+    @java.lang.Override
+    public final io.grpc.ServerServiceDefinition bindService() {
+      return io.grpc.ServerServiceDefinition.builder(getServiceDescriptor())
+          .addMethod(
+              getListChangelogsMethod(),
+              io.grpc.stub.ServerCalls.asyncUnaryCall(
+                  new MethodHandlers<
+                      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest,
+                      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse>(
+                      this, METHODID_LIST_CHANGELOGS)))
+          .addMethod(
+              getGetChangelogMethod(),
+              io.grpc.stub.ServerCalls.asyncUnaryCall(
+                  new MethodHandlers<
+                      com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest,
+                      com.google.cloud.dialogflow.cx.v3beta1.Changelog>(
+                      this, METHODID_GET_CHANGELOG)))
+          .build();
+    }
+  }
+
+  /**
+   *
+   *
+   * <pre>
+   * Service for managing [Changelogs][google.cloud.dialogflow.cx.v3beta1.Changelog].
+   * </pre>
+   */
+  public static final class ChangelogsStub extends io.grpc.stub.AbstractAsyncStub<ChangelogsStub> {
+    private ChangelogsStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      super(channel, callOptions);
+    }
+
+    @java.lang.Override
+    protected ChangelogsStub build(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      return new ChangelogsStub(channel, callOptions);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Returns the list of Changelogs.
+     * </pre>
+     */
+    public void listChangelogs(
+        com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest request,
+        io.grpc.stub.StreamObserver<com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse>
+            responseObserver) {
+      io.grpc.stub.ClientCalls.asyncUnaryCall(
+          getChannel().newCall(getListChangelogsMethod(), getCallOptions()),
+          request,
+          responseObserver);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Retrieves the specified Changelog.
+     * </pre>
+     */
+    public void getChangelog(
+        com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest request,
+        io.grpc.stub.StreamObserver<com.google.cloud.dialogflow.cx.v3beta1.Changelog>
+            responseObserver) {
+      io.grpc.stub.ClientCalls.asyncUnaryCall(
+          getChannel().newCall(getGetChangelogMethod(), getCallOptions()),
+          request,
+          responseObserver);
+    }
+  }
+
+  /**
+   *
+   *
+   * <pre>
+   * Service for managing [Changelogs][google.cloud.dialogflow.cx.v3beta1.Changelog].
+   * </pre>
+   */
+  public static final class ChangelogsBlockingStub
+      extends io.grpc.stub.AbstractBlockingStub<ChangelogsBlockingStub> {
+    private ChangelogsBlockingStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      super(channel, callOptions);
+    }
+
+    @java.lang.Override
+    protected ChangelogsBlockingStub build(
+        io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      return new ChangelogsBlockingStub(channel, callOptions);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Returns the list of Changelogs.
+     * </pre>
+     */
+    public com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse listChangelogs(
+        com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest request) {
+      return io.grpc.stub.ClientCalls.blockingUnaryCall(
+          getChannel(), getListChangelogsMethod(), getCallOptions(), request);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Retrieves the specified Changelog.
+     * </pre>
+     */
+    public com.google.cloud.dialogflow.cx.v3beta1.Changelog getChangelog(
+        com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest request) {
+      return io.grpc.stub.ClientCalls.blockingUnaryCall(
+          getChannel(), getGetChangelogMethod(), getCallOptions(), request);
+    }
+  }
+
+  /**
+   *
+   *
+   * <pre>
+   * Service for managing [Changelogs][google.cloud.dialogflow.cx.v3beta1.Changelog].
+   * </pre>
+   */
+  public static final class ChangelogsFutureStub
+      extends io.grpc.stub.AbstractFutureStub<ChangelogsFutureStub> {
+    private ChangelogsFutureStub(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      super(channel, callOptions);
+    }
+
+    @java.lang.Override
+    protected ChangelogsFutureStub build(io.grpc.Channel channel, io.grpc.CallOptions callOptions) {
+      return new ChangelogsFutureStub(channel, callOptions);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Returns the list of Changelogs.
+     * </pre>
+     */
+    public com.google.common.util.concurrent.ListenableFuture<
+            com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse>
+        listChangelogs(com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest request) {
+      return io.grpc.stub.ClientCalls.futureUnaryCall(
+          getChannel().newCall(getListChangelogsMethod(), getCallOptions()), request);
+    }
+
+    /**
+     *
+     *
+     * <pre>
+     * Retrieves the specified Changelog.
+     * </pre>
+     */
+    public com.google.common.util.concurrent.ListenableFuture<
+            com.google.cloud.dialogflow.cx.v3beta1.Changelog>
+        getChangelog(com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest request) {
+      return io.grpc.stub.ClientCalls.futureUnaryCall(
+          getChannel().newCall(getGetChangelogMethod(), getCallOptions()), request);
+    }
+  }
+
+  private static final int METHODID_LIST_CHANGELOGS = 0;
+  private static final int METHODID_GET_CHANGELOG = 1;
+
+  private static final class MethodHandlers<Req, Resp>
+      implements io.grpc.stub.ServerCalls.UnaryMethod<Req, Resp>,
+          io.grpc.stub.ServerCalls.ServerStreamingMethod<Req, Resp>,
+          io.grpc.stub.ServerCalls.ClientStreamingMethod<Req, Resp>,
+          io.grpc.stub.ServerCalls.BidiStreamingMethod<Req, Resp> {
+    private final ChangelogsImplBase serviceImpl;
+    private final int methodId;
+
+    MethodHandlers(ChangelogsImplBase serviceImpl, int methodId) {
+      this.serviceImpl = serviceImpl;
+      this.methodId = methodId;
+    }
+
+    @java.lang.Override
+    @java.lang.SuppressWarnings("unchecked")
+    public void invoke(Req request, io.grpc.stub.StreamObserver<Resp> responseObserver) {
+      switch (methodId) {
+        case METHODID_LIST_CHANGELOGS:
+          serviceImpl.listChangelogs(
+              (com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest) request,
+              (io.grpc.stub.StreamObserver<
+                      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse>)
+                  responseObserver);
+          break;
+        case METHODID_GET_CHANGELOG:
+          serviceImpl.getChangelog(
+              (com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest) request,
+              (io.grpc.stub.StreamObserver<com.google.cloud.dialogflow.cx.v3beta1.Changelog>)
+                  responseObserver);
+          break;
+        default:
+          throw new AssertionError();
+      }
+    }
+
+    @java.lang.Override
+    @java.lang.SuppressWarnings("unchecked")
+    public io.grpc.stub.StreamObserver<Req> invoke(
+        io.grpc.stub.StreamObserver<Resp> responseObserver) {
+      switch (methodId) {
+        default:
+          throw new AssertionError();
+      }
+    }
+  }
+
+  private abstract static class ChangelogsBaseDescriptorSupplier
+      implements io.grpc.protobuf.ProtoFileDescriptorSupplier,
+          io.grpc.protobuf.ProtoServiceDescriptorSupplier {
+    ChangelogsBaseDescriptorSupplier() {}
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.FileDescriptor getFileDescriptor() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto.getDescriptor();
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.ServiceDescriptor getServiceDescriptor() {
+      return getFileDescriptor().findServiceByName("Changelogs");
+    }
+  }
+
+  private static final class ChangelogsFileDescriptorSupplier
+      extends ChangelogsBaseDescriptorSupplier {
+    ChangelogsFileDescriptorSupplier() {}
+  }
+
+  private static final class ChangelogsMethodDescriptorSupplier
+      extends ChangelogsBaseDescriptorSupplier
+      implements io.grpc.protobuf.ProtoMethodDescriptorSupplier {
+    private final String methodName;
+
+    ChangelogsMethodDescriptorSupplier(String methodName) {
+      this.methodName = methodName;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.MethodDescriptor getMethodDescriptor() {
+      return getServiceDescriptor().findMethodByName(methodName);
+    }
+  }
+
+  private static volatile io.grpc.ServiceDescriptor serviceDescriptor;
+
+  public static io.grpc.ServiceDescriptor getServiceDescriptor() {
+    io.grpc.ServiceDescriptor result = serviceDescriptor;
+    if (result == null) {
+      synchronized (ChangelogsGrpc.class) {
+        result = serviceDescriptor;
+        if (result == null) {
+          serviceDescriptor =
+              result =
+                  io.grpc.ServiceDescriptor.newBuilder(SERVICE_NAME)
+                      .setSchemaDescriptor(new ChangelogsFileDescriptorSupplier())
+                      .addMethod(getListChangelogsMethod())
+                      .addMethod(getGetChangelogMethod())
+                      .build();
+        }
+      }
+    }
+    return result;
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Agent.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Agent.java
index a4a938c5a..ad8a25f30 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Agent.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Agent.java
@@ -890,35 +890,35 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDefaultLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(defaultLanguageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, defaultLanguageCode_);
     }
     for (int i = 0; i < supportedLanguageCodes_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(
           output, 4, supportedLanguageCodes_.getRaw(i));
     }
-    if (!getTimeZoneBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(timeZone_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, timeZone_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, description_);
     }
-    if (!getAvatarUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(avatarUri_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 7, avatarUri_);
     }
     if (speechToTextSettings_ != null) {
       output.writeMessage(13, getSpeechToTextSettings());
     }
-    if (!getStartFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(startFlow_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 16, startFlow_);
     }
-    if (!getSecuritySettingsBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(securitySettings_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 17, securitySettings_);
     }
     if (enableStackdriverLogging_ != false) {
@@ -939,13 +939,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDefaultLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(defaultLanguageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, defaultLanguageCode_);
     }
     {
@@ -956,23 +956,23 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getSupportedLanguageCodesList().size();
     }
-    if (!getTimeZoneBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(timeZone_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, timeZone_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, description_);
     }
-    if (!getAvatarUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(avatarUri_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, avatarUri_);
     }
     if (speechToTextSettings_ != null) {
       size +=
           com.google.protobuf.CodedOutputStream.computeMessageSize(13, getSpeechToTextSettings());
     }
-    if (!getStartFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(startFlow_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(16, startFlow_);
     }
-    if (!getSecuritySettingsBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(securitySettings_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(17, securitySettings_);
     }
     if (enableStackdriverLogging_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/AgentValidationResult.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/AgentValidationResult.java
index 4ad612c18..a3e7daa63 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/AgentValidationResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/AgentValidationResult.java
@@ -275,7 +275,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     for (int i = 0; i < flowValidationResults_.size(); i++) {
@@ -290,7 +290,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     for (int i = 0; i < flowValidationResults_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/BatchDeleteTestCasesRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/BatchDeleteTestCasesRequest.java
index 32a894f1d..286bf8d75 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/BatchDeleteTestCasesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/BatchDeleteTestCasesRequest.java
@@ -268,7 +268,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     for (int i = 0; i < names_.size(); i++) {
@@ -283,7 +283,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/BatchRunTestCasesRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/BatchRunTestCasesRequest.java
index 574b55b51..df3f8d6d1 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/BatchRunTestCasesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/BatchRunTestCasesRequest.java
@@ -333,10 +333,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, environment_);
     }
     for (int i = 0; i < testCases_.size(); i++) {
@@ -351,10 +351,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, environment_);
     }
     {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CalculateCoverageRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CalculateCoverageRequest.java
index 0aae863d9..60ea80ba5 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CalculateCoverageRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CalculateCoverageRequest.java
@@ -417,7 +417,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(2, type_);
     }
-    if (!getAgentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, agent_);
     }
     unknownFields.writeTo(output);
@@ -435,7 +435,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(2, type_);
     }
-    if (!getAgentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, agent_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CalculateCoverageResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CalculateCoverageResponse.java
index a168fbc50..6721dd43f 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CalculateCoverageResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CalculateCoverageResponse.java
@@ -449,7 +449,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (coverageTypeCase_ == 4) {
       output.writeMessage(4, (com.google.cloud.dialogflow.cx.v3.TransitionCoverage) coverageType_);
     }
-    if (!getAgentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, agent_);
     }
     if (coverageTypeCase_ == 6) {
@@ -475,7 +475,7 @@ public int getSerializedSize() {
           com.google.protobuf.CodedOutputStream.computeMessageSize(
               4, (com.google.cloud.dialogflow.cx.v3.TransitionCoverage) coverageType_);
     }
-    if (!getAgentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, agent_);
     }
     if (coverageTypeCase_ == 6) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Changelog.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Changelog.java
new file mode 100644
index 000000000..3ee5bda65
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Changelog.java
@@ -0,0 +1,1815 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3;
+
+/**
+ *
+ *
+ * <pre>
+ * Changelogs represents a change made to a given agent.
+ * </pre>
+ *
+ * Protobuf type {@code google.cloud.dialogflow.cx.v3.Changelog}
+ */
+public final class Changelog extends com.google.protobuf.GeneratedMessageV3
+    implements
+    // @@protoc_insertion_point(message_implements:google.cloud.dialogflow.cx.v3.Changelog)
+    ChangelogOrBuilder {
+  private static final long serialVersionUID = 0L;
+  // Use Changelog.newBuilder() to construct.
+  private Changelog(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+    super(builder);
+  }
+
+  private Changelog() {
+    name_ = "";
+    userEmail_ = "";
+    displayName_ = "";
+    action_ = "";
+    type_ = "";
+    resource_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+    return new Changelog();
+  }
+
+  @java.lang.Override
+  public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+    return this.unknownFields;
+  }
+
+  private Changelog(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    this();
+    if (extensionRegistry == null) {
+      throw new java.lang.NullPointerException();
+    }
+    com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+        com.google.protobuf.UnknownFieldSet.newBuilder();
+    try {
+      boolean done = false;
+      while (!done) {
+        int tag = input.readTag();
+        switch (tag) {
+          case 0:
+            done = true;
+            break;
+          case 10:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              name_ = s;
+              break;
+            }
+          case 18:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              userEmail_ = s;
+              break;
+            }
+          case 26:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              resource_ = s;
+              break;
+            }
+          case 34:
+            {
+              com.google.protobuf.Timestamp.Builder subBuilder = null;
+              if (createTime_ != null) {
+                subBuilder = createTime_.toBuilder();
+              }
+              createTime_ =
+                  input.readMessage(com.google.protobuf.Timestamp.parser(), extensionRegistry);
+              if (subBuilder != null) {
+                subBuilder.mergeFrom(createTime_);
+                createTime_ = subBuilder.buildPartial();
+              }
+
+              break;
+            }
+          case 58:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              displayName_ = s;
+              break;
+            }
+          case 66:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              type_ = s;
+              break;
+            }
+          case 90:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              action_ = s;
+              break;
+            }
+          default:
+            {
+              if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+        }
+      }
+    } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+      throw e.setUnfinishedMessage(this);
+    } catch (java.io.IOException e) {
+      throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+    } finally {
+      this.unknownFields = unknownFields.build();
+      makeExtensionsImmutable();
+    }
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+    return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3_Changelog_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3_Changelog_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            com.google.cloud.dialogflow.cx.v3.Changelog.class,
+            com.google.cloud.dialogflow.cx.v3.Changelog.Builder.class);
+  }
+
+  public static final int NAME_FIELD_NUMBER = 1;
+  private volatile java.lang.Object name_;
+  /**
+   *
+   *
+   * <pre>
+   * The unique identifier of the changelog.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>string name = 1;</code>
+   *
+   * @return The name.
+   */
+  @java.lang.Override
+  public java.lang.String getName() {
+    java.lang.Object ref = name_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      name_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The unique identifier of the changelog.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>string name = 1;</code>
+   *
+   * @return The bytes for name.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getNameBytes() {
+    java.lang.Object ref = name_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      name_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int USER_EMAIL_FIELD_NUMBER = 2;
+  private volatile java.lang.Object userEmail_;
+  /**
+   *
+   *
+   * <pre>
+   * Email address of the authenticated user.
+   * </pre>
+   *
+   * <code>string user_email = 2;</code>
+   *
+   * @return The userEmail.
+   */
+  @java.lang.Override
+  public java.lang.String getUserEmail() {
+    java.lang.Object ref = userEmail_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      userEmail_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Email address of the authenticated user.
+   * </pre>
+   *
+   * <code>string user_email = 2;</code>
+   *
+   * @return The bytes for userEmail.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getUserEmailBytes() {
+    java.lang.Object ref = userEmail_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      userEmail_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int DISPLAY_NAME_FIELD_NUMBER = 7;
+  private volatile java.lang.Object displayName_;
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource display name of the change.
+   * </pre>
+   *
+   * <code>string display_name = 7;</code>
+   *
+   * @return The displayName.
+   */
+  @java.lang.Override
+  public java.lang.String getDisplayName() {
+    java.lang.Object ref = displayName_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      displayName_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource display name of the change.
+   * </pre>
+   *
+   * <code>string display_name = 7;</code>
+   *
+   * @return The bytes for displayName.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getDisplayNameBytes() {
+    java.lang.Object ref = displayName_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      displayName_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int ACTION_FIELD_NUMBER = 11;
+  private volatile java.lang.Object action_;
+  /**
+   *
+   *
+   * <pre>
+   * The action of the change.
+   * </pre>
+   *
+   * <code>string action = 11;</code>
+   *
+   * @return The action.
+   */
+  @java.lang.Override
+  public java.lang.String getAction() {
+    java.lang.Object ref = action_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      action_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The action of the change.
+   * </pre>
+   *
+   * <code>string action = 11;</code>
+   *
+   * @return The bytes for action.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getActionBytes() {
+    java.lang.Object ref = action_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      action_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int TYPE_FIELD_NUMBER = 8;
+  private volatile java.lang.Object type_;
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource type.
+   * </pre>
+   *
+   * <code>string type = 8;</code>
+   *
+   * @return The type.
+   */
+  @java.lang.Override
+  public java.lang.String getType() {
+    java.lang.Object ref = type_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      type_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource type.
+   * </pre>
+   *
+   * <code>string type = 8;</code>
+   *
+   * @return The bytes for type.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getTypeBytes() {
+    java.lang.Object ref = type_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      type_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int RESOURCE_FIELD_NUMBER = 3;
+  private volatile java.lang.Object resource_;
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource name of the change.
+   * </pre>
+   *
+   * <code>string resource = 3;</code>
+   *
+   * @return The resource.
+   */
+  @java.lang.Override
+  public java.lang.String getResource() {
+    java.lang.Object ref = resource_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      resource_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource name of the change.
+   * </pre>
+   *
+   * <code>string resource = 3;</code>
+   *
+   * @return The bytes for resource.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getResourceBytes() {
+    java.lang.Object ref = resource_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
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+      resource_ = b;
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+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   *
+   * @return Whether the createTime field is set.
+   */
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+  public boolean hasCreateTime() {
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+  /**
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+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   *
+   * @return The createTime.
+   */
+  @java.lang.Override
+  public com.google.protobuf.Timestamp getCreateTime() {
+    return createTime_ == null ? com.google.protobuf.Timestamp.getDefaultInstance() : createTime_;
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+  /**
+   *
+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   */
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+  public com.google.protobuf.TimestampOrBuilder getCreateTimeOrBuilder() {
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+  }
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+      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, userEmail_);
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+  @java.lang.Override
+  public int getSerializedSize() {
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+    }
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+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
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+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(type_)) {
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+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(action_)) {
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+    }
+    size += unknownFields.getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (!(obj instanceof com.google.cloud.dialogflow.cx.v3.Changelog)) {
+      return super.equals(obj);
+    }
+    com.google.cloud.dialogflow.cx.v3.Changelog other =
+        (com.google.cloud.dialogflow.cx.v3.Changelog) obj;
+
+    if (!getName().equals(other.getName())) return false;
+    if (!getUserEmail().equals(other.getUserEmail())) return false;
+    if (!getDisplayName().equals(other.getDisplayName())) return false;
+    if (!getAction().equals(other.getAction())) return false;
+    if (!getType().equals(other.getType())) return false;
+    if (!getResource().equals(other.getResource())) return false;
+    if (hasCreateTime() != other.hasCreateTime()) return false;
+    if (hasCreateTime()) {
+      if (!getCreateTime().equals(other.getCreateTime())) return false;
+    }
+    if (!unknownFields.equals(other.unknownFields)) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    hash = (37 * hash) + NAME_FIELD_NUMBER;
+    hash = (53 * hash) + getName().hashCode();
+    hash = (37 * hash) + USER_EMAIL_FIELD_NUMBER;
+    hash = (53 * hash) + getUserEmail().hashCode();
+    hash = (37 * hash) + DISPLAY_NAME_FIELD_NUMBER;
+    hash = (53 * hash) + getDisplayName().hashCode();
+    hash = (37 * hash) + ACTION_FIELD_NUMBER;
+    hash = (53 * hash) + getAction().hashCode();
+    hash = (37 * hash) + TYPE_FIELD_NUMBER;
+    hash = (53 * hash) + getType().hashCode();
+    hash = (37 * hash) + RESOURCE_FIELD_NUMBER;
+    hash = (53 * hash) + getResource().hashCode();
+    if (hasCreateTime()) {
+      hash = (37 * hash) + CREATE_TIME_FIELD_NUMBER;
+      hash = (53 * hash) + getCreateTime().hashCode();
+    }
+    hash = (29 * hash) + unknownFields.hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseFrom(java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseFrom(
+      java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseFrom(
+      byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseDelimitedFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseDelimitedFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseFrom(
+      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() {
+    return newBuilder();
+  }
+
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+
+  public static Builder newBuilder(com.google.cloud.dialogflow.cx.v3.Changelog prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Changelogs represents a change made to a given agent.
+   * </pre>
+   *
+   * Protobuf type {@code google.cloud.dialogflow.cx.v3.Changelog}
+   */
+  public static final class Builder extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+      implements
+      // @@protoc_insertion_point(builder_implements:google.cloud.dialogflow.cx.v3.Changelog)
+      com.google.cloud.dialogflow.cx.v3.ChangelogOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_Changelog_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_Changelog_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              com.google.cloud.dialogflow.cx.v3.Changelog.class,
+              com.google.cloud.dialogflow.cx.v3.Changelog.Builder.class);
+    }
+
+    // Construct using com.google.cloud.dialogflow.cx.v3.Changelog.newBuilder()
+    private Builder() {
+      maybeForceBuilderInitialization();
+    }
+
+    private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+      maybeForceBuilderInitialization();
+    }
+
+    private void maybeForceBuilderInitialization() {
+      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+    }
+
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      name_ = "";
+
+      userEmail_ = "";
+
+      displayName_ = "";
+
+      action_ = "";
+
+      type_ = "";
+
+      resource_ = "";
+
+      if (createTimeBuilder_ == null) {
+        createTime_ = null;
+      } else {
+        createTime_ = null;
+        createTimeBuilder_ = null;
+      }
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_Changelog_descriptor;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.Changelog getDefaultInstanceForType() {
+      return com.google.cloud.dialogflow.cx.v3.Changelog.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.Changelog build() {
+      com.google.cloud.dialogflow.cx.v3.Changelog result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.Changelog buildPartial() {
+      com.google.cloud.dialogflow.cx.v3.Changelog result =
+          new com.google.cloud.dialogflow.cx.v3.Changelog(this);
+      result.name_ = name_;
+      result.userEmail_ = userEmail_;
+      result.displayName_ = displayName_;
+      result.action_ = action_;
+      result.type_ = type_;
+      result.resource_ = resource_;
+      if (createTimeBuilder_ == null) {
+        result.createTime_ = createTime_;
+      } else {
+        result.createTime_ = createTimeBuilder_.build();
+      }
+      onBuilt();
+      return result;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.setField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+
+    @java.lang.Override
+    public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof com.google.cloud.dialogflow.cx.v3.Changelog) {
+        return mergeFrom((com.google.cloud.dialogflow.cx.v3.Changelog) other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(com.google.cloud.dialogflow.cx.v3.Changelog other) {
+      if (other == com.google.cloud.dialogflow.cx.v3.Changelog.getDefaultInstance()) return this;
+      if (!other.getName().isEmpty()) {
+        name_ = other.name_;
+        onChanged();
+      }
+      if (!other.getUserEmail().isEmpty()) {
+        userEmail_ = other.userEmail_;
+        onChanged();
+      }
+      if (!other.getDisplayName().isEmpty()) {
+        displayName_ = other.displayName_;
+        onChanged();
+      }
+      if (!other.getAction().isEmpty()) {
+        action_ = other.action_;
+        onChanged();
+      }
+      if (!other.getType().isEmpty()) {
+        type_ = other.type_;
+        onChanged();
+      }
+      if (!other.getResource().isEmpty()) {
+        resource_ = other.resource_;
+        onChanged();
+      }
+      if (other.hasCreateTime()) {
+        mergeCreateTime(other.getCreateTime());
+      }
+      this.mergeUnknownFields(other.unknownFields);
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      com.google.cloud.dialogflow.cx.v3.Changelog parsedMessage = null;
+      try {
+        parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        parsedMessage = (com.google.cloud.dialogflow.cx.v3.Changelog) e.getUnfinishedMessage();
+        throw e.unwrapIOException();
+      } finally {
+        if (parsedMessage != null) {
+          mergeFrom(parsedMessage);
+        }
+      }
+      return this;
+    }
+
+    private java.lang.Object name_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The unique identifier of the changelog.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>string name = 1;</code>
+     *
+     * @return The name.
+     */
+    public java.lang.String getName() {
+      java.lang.Object ref = name_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        name_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The unique identifier of the changelog.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>string name = 1;</code>
+     *
+     * @return The bytes for name.
+     */
+    public com.google.protobuf.ByteString getNameBytes() {
+      java.lang.Object ref = name_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        name_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The unique identifier of the changelog.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>string name = 1;</code>
+     *
+     * @param value The name to set.
+     * @return This builder for chaining.
+     */
+    public Builder setName(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      name_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The unique identifier of the changelog.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>string name = 1;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearName() {
+
+      name_ = getDefaultInstance().getName();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The unique identifier of the changelog.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>string name = 1;</code>
+     *
+     * @param value The bytes for name to set.
+     * @return This builder for chaining.
+     */
+    public Builder setNameBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      name_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object userEmail_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * Email address of the authenticated user.
+     * </pre>
+     *
+     * <code>string user_email = 2;</code>
+     *
+     * @return The userEmail.
+     */
+    public java.lang.String getUserEmail() {
+      java.lang.Object ref = userEmail_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        userEmail_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Email address of the authenticated user.
+     * </pre>
+     *
+     * <code>string user_email = 2;</code>
+     *
+     * @return The bytes for userEmail.
+     */
+    public com.google.protobuf.ByteString getUserEmailBytes() {
+      java.lang.Object ref = userEmail_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        userEmail_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Email address of the authenticated user.
+     * </pre>
+     *
+     * <code>string user_email = 2;</code>
+     *
+     * @param value The userEmail to set.
+     * @return This builder for chaining.
+     */
+    public Builder setUserEmail(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      userEmail_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Email address of the authenticated user.
+     * </pre>
+     *
+     * <code>string user_email = 2;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearUserEmail() {
+
+      userEmail_ = getDefaultInstance().getUserEmail();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Email address of the authenticated user.
+     * </pre>
+     *
+     * <code>string user_email = 2;</code>
+     *
+     * @param value The bytes for userEmail to set.
+     * @return This builder for chaining.
+     */
+    public Builder setUserEmailBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      userEmail_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object displayName_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource display name of the change.
+     * </pre>
+     *
+     * <code>string display_name = 7;</code>
+     *
+     * @return The displayName.
+     */
+    public java.lang.String getDisplayName() {
+      java.lang.Object ref = displayName_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        displayName_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource display name of the change.
+     * </pre>
+     *
+     * <code>string display_name = 7;</code>
+     *
+     * @return The bytes for displayName.
+     */
+    public com.google.protobuf.ByteString getDisplayNameBytes() {
+      java.lang.Object ref = displayName_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        displayName_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource display name of the change.
+     * </pre>
+     *
+     * <code>string display_name = 7;</code>
+     *
+     * @param value The displayName to set.
+     * @return This builder for chaining.
+     */
+    public Builder setDisplayName(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      displayName_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource display name of the change.
+     * </pre>
+     *
+     * <code>string display_name = 7;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearDisplayName() {
+
+      displayName_ = getDefaultInstance().getDisplayName();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource display name of the change.
+     * </pre>
+     *
+     * <code>string display_name = 7;</code>
+     *
+     * @param value The bytes for displayName to set.
+     * @return This builder for chaining.
+     */
+    public Builder setDisplayNameBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      displayName_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object action_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The action of the change.
+     * </pre>
+     *
+     * <code>string action = 11;</code>
+     *
+     * @return The action.
+     */
+    public java.lang.String getAction() {
+      java.lang.Object ref = action_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        action_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The action of the change.
+     * </pre>
+     *
+     * <code>string action = 11;</code>
+     *
+     * @return The bytes for action.
+     */
+    public com.google.protobuf.ByteString getActionBytes() {
+      java.lang.Object ref = action_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        action_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The action of the change.
+     * </pre>
+     *
+     * <code>string action = 11;</code>
+     *
+     * @param value The action to set.
+     * @return This builder for chaining.
+     */
+    public Builder setAction(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      action_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The action of the change.
+     * </pre>
+     *
+     * <code>string action = 11;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearAction() {
+
+      action_ = getDefaultInstance().getAction();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The action of the change.
+     * </pre>
+     *
+     * <code>string action = 11;</code>
+     *
+     * @param value The bytes for action to set.
+     * @return This builder for chaining.
+     */
+    public Builder setActionBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      action_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object type_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource type.
+     * </pre>
+     *
+     * <code>string type = 8;</code>
+     *
+     * @return The type.
+     */
+    public java.lang.String getType() {
+      java.lang.Object ref = type_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        type_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource type.
+     * </pre>
+     *
+     * <code>string type = 8;</code>
+     *
+     * @return The bytes for type.
+     */
+    public com.google.protobuf.ByteString getTypeBytes() {
+      java.lang.Object ref = type_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        type_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource type.
+     * </pre>
+     *
+     * <code>string type = 8;</code>
+     *
+     * @param value The type to set.
+     * @return This builder for chaining.
+     */
+    public Builder setType(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      type_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource type.
+     * </pre>
+     *
+     * <code>string type = 8;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearType() {
+
+      type_ = getDefaultInstance().getType();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource type.
+     * </pre>
+     *
+     * <code>string type = 8;</code>
+     *
+     * @param value The bytes for type to set.
+     * @return This builder for chaining.
+     */
+    public Builder setTypeBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      type_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object resource_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource name of the change.
+     * </pre>
+     *
+     * <code>string resource = 3;</code>
+     *
+     * @return The resource.
+     */
+    public java.lang.String getResource() {
+      java.lang.Object ref = resource_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        resource_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource name of the change.
+     * </pre>
+     *
+     * <code>string resource = 3;</code>
+     *
+     * @return The bytes for resource.
+     */
+    public com.google.protobuf.ByteString getResourceBytes() {
+      java.lang.Object ref = resource_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        resource_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource name of the change.
+     * </pre>
+     *
+     * <code>string resource = 3;</code>
+     *
+     * @param value The resource to set.
+     * @return This builder for chaining.
+     */
+    public Builder setResource(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      resource_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource name of the change.
+     * </pre>
+     *
+     * <code>string resource = 3;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearResource() {
+
+      resource_ = getDefaultInstance().getResource();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource name of the change.
+     * </pre>
+     *
+     * <code>string resource = 3;</code>
+     *
+     * @param value The bytes for resource to set.
+     * @return This builder for chaining.
+     */
+    public Builder setResourceBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      resource_ = value;
+      onChanged();
+      return this;
+    }
+
+    private com.google.protobuf.Timestamp createTime_;
+    private com.google.protobuf.SingleFieldBuilderV3<
+            com.google.protobuf.Timestamp,
+            com.google.protobuf.Timestamp.Builder,
+            com.google.protobuf.TimestampOrBuilder>
+        createTimeBuilder_;
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     *
+     * @return Whether the createTime field is set.
+     */
+    public boolean hasCreateTime() {
+      return createTimeBuilder_ != null || createTime_ != null;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     *
+     * @return The createTime.
+     */
+    public com.google.protobuf.Timestamp getCreateTime() {
+      if (createTimeBuilder_ == null) {
+        return createTime_ == null
+            ? com.google.protobuf.Timestamp.getDefaultInstance()
+            : createTime_;
+      } else {
+        return createTimeBuilder_.getMessage();
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public Builder setCreateTime(com.google.protobuf.Timestamp value) {
+      if (createTimeBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        createTime_ = value;
+        onChanged();
+      } else {
+        createTimeBuilder_.setMessage(value);
+      }
+
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public Builder setCreateTime(com.google.protobuf.Timestamp.Builder builderForValue) {
+      if (createTimeBuilder_ == null) {
+        createTime_ = builderForValue.build();
+        onChanged();
+      } else {
+        createTimeBuilder_.setMessage(builderForValue.build());
+      }
+
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public Builder mergeCreateTime(com.google.protobuf.Timestamp value) {
+      if (createTimeBuilder_ == null) {
+        if (createTime_ != null) {
+          createTime_ =
+              com.google.protobuf.Timestamp.newBuilder(createTime_).mergeFrom(value).buildPartial();
+        } else {
+          createTime_ = value;
+        }
+        onChanged();
+      } else {
+        createTimeBuilder_.mergeFrom(value);
+      }
+
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public Builder clearCreateTime() {
+      if (createTimeBuilder_ == null) {
+        createTime_ = null;
+        onChanged();
+      } else {
+        createTime_ = null;
+        createTimeBuilder_ = null;
+      }
+
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public com.google.protobuf.Timestamp.Builder getCreateTimeBuilder() {
+
+      onChanged();
+      return getCreateTimeFieldBuilder().getBuilder();
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public com.google.protobuf.TimestampOrBuilder getCreateTimeOrBuilder() {
+      if (createTimeBuilder_ != null) {
+        return createTimeBuilder_.getMessageOrBuilder();
+      } else {
+        return createTime_ == null
+            ? com.google.protobuf.Timestamp.getDefaultInstance()
+            : createTime_;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    private com.google.protobuf.SingleFieldBuilderV3<
+            com.google.protobuf.Timestamp,
+            com.google.protobuf.Timestamp.Builder,
+            com.google.protobuf.TimestampOrBuilder>
+        getCreateTimeFieldBuilder() {
+      if (createTimeBuilder_ == null) {
+        createTimeBuilder_ =
+            new com.google.protobuf.SingleFieldBuilderV3<
+                com.google.protobuf.Timestamp,
+                com.google.protobuf.Timestamp.Builder,
+                com.google.protobuf.TimestampOrBuilder>(
+                getCreateTime(), getParentForChildren(), isClean());
+        createTime_ = null;
+      }
+      return createTimeBuilder_;
+    }
+
+    @java.lang.Override
+    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+    // @@protoc_insertion_point(builder_scope:google.cloud.dialogflow.cx.v3.Changelog)
+  }
+
+  // @@protoc_insertion_point(class_scope:google.cloud.dialogflow.cx.v3.Changelog)
+  private static final com.google.cloud.dialogflow.cx.v3.Changelog DEFAULT_INSTANCE;
+
+  static {
+    DEFAULT_INSTANCE = new com.google.cloud.dialogflow.cx.v3.Changelog();
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.Changelog getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser<Changelog> PARSER =
+      new com.google.protobuf.AbstractParser<Changelog>() {
+        @java.lang.Override
+        public Changelog parsePartialFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws com.google.protobuf.InvalidProtocolBufferException {
+          return new Changelog(input, extensionRegistry);
+        }
+      };
+
+  public static com.google.protobuf.Parser<Changelog> parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser<Changelog> getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3.Changelog getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogName.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogName.java
new file mode 100644
index 000000000..621ef6d6e
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogName.java
@@ -0,0 +1,257 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3;
+
+import com.google.api.pathtemplate.PathTemplate;
+import com.google.api.resourcenames.ResourceName;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableMap;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+@Generated("by gapic-generator-java")
+public class ChangelogName implements ResourceName {
+  private static final PathTemplate PROJECT_LOCATION_AGENT_CHANGELOG =
+      PathTemplate.createWithoutUrlEncoding(
+          "projects/{project}/locations/{location}/agents/{agent}/changelogs/{changelog}");
+  private volatile Map<String, String> fieldValuesMap;
+  private final String project;
+  private final String location;
+  private final String agent;
+  private final String changelog;
+
+  @Deprecated
+  protected ChangelogName() {
+    project = null;
+    location = null;
+    agent = null;
+    changelog = null;
+  }
+
+  private ChangelogName(Builder builder) {
+    project = Preconditions.checkNotNull(builder.getProject());
+    location = Preconditions.checkNotNull(builder.getLocation());
+    agent = Preconditions.checkNotNull(builder.getAgent());
+    changelog = Preconditions.checkNotNull(builder.getChangelog());
+  }
+
+  public String getProject() {
+    return project;
+  }
+
+  public String getLocation() {
+    return location;
+  }
+
+  public String getAgent() {
+    return agent;
+  }
+
+  public String getChangelog() {
+    return changelog;
+  }
+
+  public static Builder newBuilder() {
+    return new Builder();
+  }
+
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  public static ChangelogName of(String project, String location, String agent, String changelog) {
+    return newBuilder()
+        .setProject(project)
+        .setLocation(location)
+        .setAgent(agent)
+        .setChangelog(changelog)
+        .build();
+  }
+
+  public static String format(String project, String location, String agent, String changelog) {
+    return newBuilder()
+        .setProject(project)
+        .setLocation(location)
+        .setAgent(agent)
+        .setChangelog(changelog)
+        .build()
+        .toString();
+  }
+
+  public static ChangelogName parse(String formattedString) {
+    if (formattedString.isEmpty()) {
+      return null;
+    }
+    Map<String, String> matchMap =
+        PROJECT_LOCATION_AGENT_CHANGELOG.validatedMatch(
+            formattedString, "ChangelogName.parse: formattedString not in valid format");
+    return of(
+        matchMap.get("project"),
+        matchMap.get("location"),
+        matchMap.get("agent"),
+        matchMap.get("changelog"));
+  }
+
+  public static List<ChangelogName> parseList(List<String> formattedStrings) {
+    List<ChangelogName> list = new ArrayList<>(formattedStrings.size());
+    for (String formattedString : formattedStrings) {
+      list.add(parse(formattedString));
+    }
+    return list;
+  }
+
+  public static List<String> toStringList(List<ChangelogName> values) {
+    List<String> list = new ArrayList<>(values.size());
+    for (ChangelogName value : values) {
+      if (value == null) {
+        list.add("");
+      } else {
+        list.add(value.toString());
+      }
+    }
+    return list;
+  }
+
+  public static boolean isParsableFrom(String formattedString) {
+    return PROJECT_LOCATION_AGENT_CHANGELOG.matches(formattedString);
+  }
+
+  @Override
+  public Map<String, String> getFieldValuesMap() {
+    if (fieldValuesMap == null) {
+      synchronized (this) {
+        if (fieldValuesMap == null) {
+          ImmutableMap.Builder<String, String> fieldMapBuilder = ImmutableMap.builder();
+          if (project != null) {
+            fieldMapBuilder.put("project", project);
+          }
+          if (location != null) {
+            fieldMapBuilder.put("location", location);
+          }
+          if (agent != null) {
+            fieldMapBuilder.put("agent", agent);
+          }
+          if (changelog != null) {
+            fieldMapBuilder.put("changelog", changelog);
+          }
+          fieldValuesMap = fieldMapBuilder.build();
+        }
+      }
+    }
+    return fieldValuesMap;
+  }
+
+  public String getFieldValue(String fieldName) {
+    return getFieldValuesMap().get(fieldName);
+  }
+
+  @Override
+  public String toString() {
+    return PROJECT_LOCATION_AGENT_CHANGELOG.instantiate(
+        "project", project, "location", location, "agent", agent, "changelog", changelog);
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (o == this) {
+      return true;
+    }
+    if (o != null || getClass() == o.getClass()) {
+      ChangelogName that = ((ChangelogName) o);
+      return Objects.equals(this.project, that.project)
+          && Objects.equals(this.location, that.location)
+          && Objects.equals(this.agent, that.agent)
+          && Objects.equals(this.changelog, that.changelog);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    int h = 1;
+    h *= 1000003;
+    h ^= Objects.hashCode(project);
+    h *= 1000003;
+    h ^= Objects.hashCode(location);
+    h *= 1000003;
+    h ^= Objects.hashCode(agent);
+    h *= 1000003;
+    h ^= Objects.hashCode(changelog);
+    return h;
+  }
+
+  /** Builder for projects/{project}/locations/{location}/agents/{agent}/changelogs/{changelog}. */
+  public static class Builder {
+    private String project;
+    private String location;
+    private String agent;
+    private String changelog;
+
+    protected Builder() {}
+
+    public String getProject() {
+      return project;
+    }
+
+    public String getLocation() {
+      return location;
+    }
+
+    public String getAgent() {
+      return agent;
+    }
+
+    public String getChangelog() {
+      return changelog;
+    }
+
+    public Builder setProject(String project) {
+      this.project = project;
+      return this;
+    }
+
+    public Builder setLocation(String location) {
+      this.location = location;
+      return this;
+    }
+
+    public Builder setAgent(String agent) {
+      this.agent = agent;
+      return this;
+    }
+
+    public Builder setChangelog(String changelog) {
+      this.changelog = changelog;
+      return this;
+    }
+
+    private Builder(ChangelogName changelogName) {
+      this.project = changelogName.project;
+      this.location = changelogName.location;
+      this.agent = changelogName.agent;
+      this.changelog = changelogName.changelog;
+    }
+
+    public ChangelogName build() {
+      return new ChangelogName(this);
+    }
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogOrBuilder.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogOrBuilder.java
new file mode 100644
index 000000000..92745e3e9
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogOrBuilder.java
@@ -0,0 +1,214 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3;
+
+public interface ChangelogOrBuilder
+    extends
+    // @@protoc_insertion_point(interface_extends:google.cloud.dialogflow.cx.v3.Changelog)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   *
+   *
+   * <pre>
+   * The unique identifier of the changelog.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>string name = 1;</code>
+   *
+   * @return The name.
+   */
+  java.lang.String getName();
+  /**
+   *
+   *
+   * <pre>
+   * The unique identifier of the changelog.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>string name = 1;</code>
+   *
+   * @return The bytes for name.
+   */
+  com.google.protobuf.ByteString getNameBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * Email address of the authenticated user.
+   * </pre>
+   *
+   * <code>string user_email = 2;</code>
+   *
+   * @return The userEmail.
+   */
+  java.lang.String getUserEmail();
+  /**
+   *
+   *
+   * <pre>
+   * Email address of the authenticated user.
+   * </pre>
+   *
+   * <code>string user_email = 2;</code>
+   *
+   * @return The bytes for userEmail.
+   */
+  com.google.protobuf.ByteString getUserEmailBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource display name of the change.
+   * </pre>
+   *
+   * <code>string display_name = 7;</code>
+   *
+   * @return The displayName.
+   */
+  java.lang.String getDisplayName();
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource display name of the change.
+   * </pre>
+   *
+   * <code>string display_name = 7;</code>
+   *
+   * @return The bytes for displayName.
+   */
+  com.google.protobuf.ByteString getDisplayNameBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The action of the change.
+   * </pre>
+   *
+   * <code>string action = 11;</code>
+   *
+   * @return The action.
+   */
+  java.lang.String getAction();
+  /**
+   *
+   *
+   * <pre>
+   * The action of the change.
+   * </pre>
+   *
+   * <code>string action = 11;</code>
+   *
+   * @return The bytes for action.
+   */
+  com.google.protobuf.ByteString getActionBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource type.
+   * </pre>
+   *
+   * <code>string type = 8;</code>
+   *
+   * @return The type.
+   */
+  java.lang.String getType();
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource type.
+   * </pre>
+   *
+   * <code>string type = 8;</code>
+   *
+   * @return The bytes for type.
+   */
+  com.google.protobuf.ByteString getTypeBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource name of the change.
+   * </pre>
+   *
+   * <code>string resource = 3;</code>
+   *
+   * @return The resource.
+   */
+  java.lang.String getResource();
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource name of the change.
+   * </pre>
+   *
+   * <code>string resource = 3;</code>
+   *
+   * @return The bytes for resource.
+   */
+  com.google.protobuf.ByteString getResourceBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   *
+   * @return Whether the createTime field is set.
+   */
+  boolean hasCreateTime();
+  /**
+   *
+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   *
+   * @return The createTime.
+   */
+  com.google.protobuf.Timestamp getCreateTime();
+  /**
+   *
+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   */
+  com.google.protobuf.TimestampOrBuilder getCreateTimeOrBuilder();
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogProto.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogProto.java
new file mode 100644
index 000000000..d3e4a66a4
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ChangelogProto.java
@@ -0,0 +1,160 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3;
+
+public final class ChangelogProto {
+  private ChangelogProto() {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+
+  static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsRequest_descriptor;
+  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsRequest_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsResponse_descriptor;
+  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsResponse_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_google_cloud_dialogflow_cx_v3_GetChangelogRequest_descriptor;
+  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_google_cloud_dialogflow_cx_v3_GetChangelogRequest_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_google_cloud_dialogflow_cx_v3_Changelog_descriptor;
+  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_google_cloud_dialogflow_cx_v3_Changelog_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
+    return descriptor;
+  }
+
+  private static com.google.protobuf.Descriptors.FileDescriptor descriptor;
+
+  static {
+    java.lang.String[] descriptorData = {
+      "\n-google/cloud/dialogflow/cx/v3/changelo"
+          + "g.proto\022\035google.cloud.dialogflow.cx.v3\032\034"
+          + "google/api/annotations.proto\032\027google/api"
+          + "/client.proto\032\037google/api/field_behavior"
+          + ".proto\032\031google/api/resource.proto\032\034googl"
+          + "e/protobuf/struct.proto\032\037google/protobuf"
+          + "/timestamp.proto\"\213\001\n\025ListChangelogsReque"
+          + "st\022;\n\006parent\030\001 \001(\tB+\340A\002\372A%\022#dialogflow.g"
+          + "oogleapis.com/Changelog\022\016\n\006filter\030\002 \001(\t\022"
+          + "\021\n\tpage_size\030\003 \001(\005\022\022\n\npage_token\030\004 \001(\t\"o"
+          + "\n\026ListChangelogsResponse\022<\n\nchangelogs\030\001"
+          + " \003(\0132(.google.cloud.dialogflow.cx.v3.Cha"
+          + "ngelog\022\027\n\017next_page_token\030\002 \001(\t\"P\n\023GetCh"
+          + "angelogRequest\0229\n\004name\030\001 \001(\tB+\340A\002\372A%\n#di"
+          + "alogflow.googleapis.com/Changelog\"\235\002\n\tCh"
+          + "angelog\022\014\n\004name\030\001 \001(\t\022\022\n\nuser_email\030\002 \001("
+          + "\t\022\024\n\014display_name\030\007 \001(\t\022\016\n\006action\030\013 \001(\t\022"
+          + "\014\n\004type\030\010 \001(\t\022\020\n\010resource\030\003 \001(\t\022/\n\013creat"
+          + "e_time\030\004 \001(\0132\032.google.protobuf.Timestamp"
+          + ":w\352At\n#dialogflow.googleapis.com/Changel"
+          + "og\022Mprojects/{project}/locations/{locati"
+          + "on}/agents/{agent}/changelogs/{changelog"
+          + "}2\207\004\n\nChangelogs\022\307\001\n\016ListChangelogs\0224.go"
+          + "ogle.cloud.dialogflow.cx.v3.ListChangelo"
+          + "gsRequest\0325.google.cloud.dialogflow.cx.v"
+          + "3.ListChangelogsResponse\"H\202\323\344\223\0029\0227/v3/{p"
+          + "arent=projects/*/locations/*/agents/*}/c"
+          + "hangelogs\332A\006parent\022\264\001\n\014GetChangelog\0222.go"
+          + "ogle.cloud.dialogflow.cx.v3.GetChangelog"
+          + "Request\032(.google.cloud.dialogflow.cx.v3."
+          + "Changelog\"F\202\323\344\223\0029\0227/v3/{name=projects/*/"
+          + "locations/*/agents/*/changelogs/*}\332A\004nam"
+          + "e\032x\312A\031dialogflow.googleapis.com\322AYhttps:"
+          + "//www.googleapis.com/auth/cloud-platform"
+          + ",https://www.googleapis.com/auth/dialogf"
+          + "lowB\302\001\n!com.google.cloud.dialogflow.cx.v"
+          + "3B\016ChangelogProtoP\001Z?google.golang.org/g"
+          + "enproto/googleapis/cloud/dialogflow/cx/v"
+          + "3;cx\370\001\001\242\002\002DF\252\002\035Google.Cloud.Dialogflow.C"
+          + "x.V3\352\002!Google::Cloud::Dialogflow::CX::V3"
+          + "b\006proto3"
+    };
+    descriptor =
+        com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
+            descriptorData,
+            new com.google.protobuf.Descriptors.FileDescriptor[] {
+              com.google.api.AnnotationsProto.getDescriptor(),
+              com.google.api.ClientProto.getDescriptor(),
+              com.google.api.FieldBehaviorProto.getDescriptor(),
+              com.google.api.ResourceProto.getDescriptor(),
+              com.google.protobuf.StructProto.getDescriptor(),
+              com.google.protobuf.TimestampProto.getDescriptor(),
+            });
+    internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsRequest_descriptor =
+        getDescriptor().getMessageTypes().get(0);
+    internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsRequest_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsRequest_descriptor,
+            new java.lang.String[] {
+              "Parent", "Filter", "PageSize", "PageToken",
+            });
+    internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsResponse_descriptor =
+        getDescriptor().getMessageTypes().get(1);
+    internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsResponse_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsResponse_descriptor,
+            new java.lang.String[] {
+              "Changelogs", "NextPageToken",
+            });
+    internal_static_google_cloud_dialogflow_cx_v3_GetChangelogRequest_descriptor =
+        getDescriptor().getMessageTypes().get(2);
+    internal_static_google_cloud_dialogflow_cx_v3_GetChangelogRequest_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_google_cloud_dialogflow_cx_v3_GetChangelogRequest_descriptor,
+            new java.lang.String[] {
+              "Name",
+            });
+    internal_static_google_cloud_dialogflow_cx_v3_Changelog_descriptor =
+        getDescriptor().getMessageTypes().get(3);
+    internal_static_google_cloud_dialogflow_cx_v3_Changelog_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_google_cloud_dialogflow_cx_v3_Changelog_descriptor,
+            new java.lang.String[] {
+              "Name", "UserEmail", "DisplayName", "Action", "Type", "Resource", "CreateTime",
+            });
+    com.google.protobuf.ExtensionRegistry registry =
+        com.google.protobuf.ExtensionRegistry.newInstance();
+    registry.add(com.google.api.ClientProto.defaultHost);
+    registry.add(com.google.api.FieldBehaviorProto.fieldBehavior);
+    registry.add(com.google.api.AnnotationsProto.http);
+    registry.add(com.google.api.ClientProto.methodSignature);
+    registry.add(com.google.api.ClientProto.oauthScopes);
+    registry.add(com.google.api.ResourceProto.resource);
+    registry.add(com.google.api.ResourceProto.resourceReference);
+    com.google.protobuf.Descriptors.FileDescriptor.internalUpdateFileDescriptor(
+        descriptor, registry);
+    com.google.api.AnnotationsProto.getDescriptor();
+    com.google.api.ClientProto.getDescriptor();
+    com.google.api.FieldBehaviorProto.getDescriptor();
+    com.google.api.ResourceProto.getDescriptor();
+    com.google.protobuf.StructProto.getDescriptor();
+    com.google.protobuf.TimestampProto.getDescriptor();
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ContinuousTestResult.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ContinuousTestResult.java
index ef9a7696a..d327ab070 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ContinuousTestResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ContinuousTestResult.java
@@ -530,7 +530,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (result_
@@ -554,7 +554,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (result_
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateAgentRequest.java
index 07e85fa25..b1b1e459b 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateAgentRequest.java
@@ -245,7 +245,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (agent_ != null) {
@@ -260,7 +260,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (agent_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateEntityTypeRequest.java
index 3430ece99..3c230c753 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateEntityTypeRequest.java
@@ -323,13 +323,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (entityType_ != null) {
       output.writeMessage(2, getEntityType());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -341,13 +341,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (entityType_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getEntityType());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateEnvironmentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateEnvironmentRequest.java
index 9783c9410..6592d95d7 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateEnvironmentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateEnvironmentRequest.java
@@ -250,7 +250,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (environment_ != null) {
@@ -265,7 +265,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (environment_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateExperimentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateExperimentRequest.java
index 5a4f5cc03..55efb137b 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateExperimentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateExperimentRequest.java
@@ -252,7 +252,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (experiment_ != null) {
@@ -267,7 +267,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (experiment_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateFlowRequest.java
index 32c8c8f4f..6f34710a1 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateFlowRequest.java
@@ -320,13 +320,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (flow_ != null) {
       output.writeMessage(2, getFlow());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -338,13 +338,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (flow_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getFlow());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateIntentRequest.java
index 6b30d6f53..8e4feca2c 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateIntentRequest.java
@@ -319,13 +319,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (intent_ != null) {
       output.writeMessage(2, getIntent());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -337,13 +337,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (intent_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getIntent());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreatePageRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreatePageRequest.java
index 99645ef86..43b8623cc 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreatePageRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreatePageRequest.java
@@ -338,13 +338,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (page_ != null) {
       output.writeMessage(2, getPage());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -356,13 +356,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (page_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getPage());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateSecuritySettingsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateSecuritySettingsRequest.java
index 55fdd5c27..9191134ee 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateSecuritySettingsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateSecuritySettingsRequest.java
@@ -252,7 +252,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (securitySettings_ != null) {
@@ -267,7 +267,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (securitySettings_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateSessionEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateSessionEntityTypeRequest.java
index 3a1504507..a696d33ff 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateSessionEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateSessionEntityTypeRequest.java
@@ -261,7 +261,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (sessionEntityType_ != null) {
@@ -276,7 +276,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (sessionEntityType_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateTestCaseRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateTestCaseRequest.java
index d6be672d9..21c7aeb96 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateTestCaseRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateTestCaseRequest.java
@@ -250,7 +250,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (testCase_ != null) {
@@ -265,7 +265,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (testCase_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateTransitionRouteGroupRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateTransitionRouteGroupRequest.java
index 7cb4622d1..d1cd5f6b6 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateTransitionRouteGroupRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateTransitionRouteGroupRequest.java
@@ -328,13 +328,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (transitionRouteGroup_ != null) {
       output.writeMessage(2, getTransitionRouteGroup());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -346,14 +346,14 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (transitionRouteGroup_ != null) {
       size +=
           com.google.protobuf.CodedOutputStream.computeMessageSize(2, getTransitionRouteGroup());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateVersionOperationMetadata.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateVersionOperationMetadata.java
index 19089f1e3..7fd27f0a0 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateVersionOperationMetadata.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateVersionOperationMetadata.java
@@ -180,7 +180,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, version_);
     }
     unknownFields.writeTo(output);
@@ -192,7 +192,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, version_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateVersionRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateVersionRequest.java
index a60ae3f78..4ad3fceb1 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateVersionRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateVersionRequest.java
@@ -252,7 +252,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (version_ != null) {
@@ -267,7 +267,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (version_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateWebhookRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateWebhookRequest.java
index 5fc4e61ae..61e64c4a6 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateWebhookRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/CreateWebhookRequest.java
@@ -250,7 +250,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (webhook_ != null) {
@@ -265,7 +265,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (webhook_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteAgentRequest.java
index d99110523..57e4ba236 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteAgentRequest.java
@@ -180,7 +180,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -192,7 +192,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteEntityTypeRequest.java
index 6aca39ad8..addfbadc6 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteEntityTypeRequest.java
@@ -213,7 +213,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (force_ != false) {
@@ -228,7 +228,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (force_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteEnvironmentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteEnvironmentRequest.java
index 9b51797bb..de7f85f74 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteEnvironmentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteEnvironmentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteExperimentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteExperimentRequest.java
index 453bc158a..f4d3f2bb7 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteExperimentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteExperimentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteFlowRequest.java
index 9e360e048..f44db62d5 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteFlowRequest.java
@@ -213,7 +213,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (force_ != false) {
@@ -228,7 +228,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (force_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteIntentRequest.java
index 6d90a7c4a..bfc611906 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteIntentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeletePageRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeletePageRequest.java
index a8bdb72a1..e8dcf473f 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeletePageRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeletePageRequest.java
@@ -213,7 +213,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (force_ != false) {
@@ -228,7 +228,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (force_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteSecuritySettingsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteSecuritySettingsRequest.java
index 28100bc80..d93a9c084 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteSecuritySettingsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteSecuritySettingsRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteSessionEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteSessionEntityTypeRequest.java
index 542a3a06e..57d364a67 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteSessionEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteSessionEntityTypeRequest.java
@@ -191,7 +191,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -203,7 +203,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteTransitionRouteGroupRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteTransitionRouteGroupRequest.java
index 36168831e..8fef37684 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteTransitionRouteGroupRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteTransitionRouteGroupRequest.java
@@ -211,7 +211,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (force_ != false) {
@@ -226,7 +226,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (force_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteVersionRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteVersionRequest.java
index 760bcb03b..eb580cf9d 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteVersionRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteVersionRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteWebhookRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteWebhookRequest.java
index b946069db..ee0ec2b48 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteWebhookRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeleteWebhookRequest.java
@@ -212,7 +212,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (force_ != false) {
@@ -227,7 +227,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (force_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeployFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeployFlowRequest.java
index f930c719c..37e53ee1b 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeployFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeployFlowRequest.java
@@ -247,10 +247,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, environment_);
     }
-    if (!getFlowVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowVersion_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, flowVersion_);
     }
     unknownFields.writeTo(output);
@@ -262,10 +262,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, environment_);
     }
-    if (!getFlowVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowVersion_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, flowVersion_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeployFlowResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeployFlowResponse.java
index 70cc6aa43..566a132c4 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeployFlowResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DeployFlowResponse.java
@@ -245,7 +245,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (environment_ != null) {
       output.writeMessage(1, getEnvironment());
     }
-    if (!getDeploymentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(deployment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, deployment_);
     }
     unknownFields.writeTo(output);
@@ -260,7 +260,7 @@ public int getSerializedSize() {
     if (environment_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, getEnvironment());
     }
-    if (!getDeploymentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(deployment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, deployment_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Deployment.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Deployment.java
index 3011c1bbb..3a82c4e0c 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Deployment.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Deployment.java
@@ -705,7 +705,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
         com.google.protobuf.GeneratedMessageV3.writeString(
             output, 1, deploymentTestResults_.getRaw(i));
       }
-      if (!getExperimentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(experiment_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 2, experiment_);
       }
       unknownFields.writeTo(output);
@@ -725,7 +725,7 @@ public int getSerializedSize() {
         size += dataSize;
         size += 1 * getDeploymentTestResultsList().size();
       }
-      if (!getExperimentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(experiment_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, experiment_);
       }
       size += unknownFields.getSerializedSize();
@@ -1719,10 +1719,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getFlowVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowVersion_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, flowVersion_);
     }
     if (state_
@@ -1747,10 +1747,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getFlowVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowVersion_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, flowVersion_);
     }
     if (state_
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DetectIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DetectIntentRequest.java
index 1d9119871..07d0a8501 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DetectIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DetectIntentRequest.java
@@ -405,7 +405,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, session_);
     }
     if (queryParams_ != null) {
@@ -426,7 +426,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, session_);
     }
     if (queryParams_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DetectIntentResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DetectIntentResponse.java
index c7792b32b..25cddba58 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DetectIntentResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DetectIntentResponse.java
@@ -575,7 +575,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(responseId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, responseId_);
     }
     if (queryResult_ != null) {
@@ -605,7 +605,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(responseId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, responseId_);
     }
     if (queryResult_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DtmfInput.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DtmfInput.java
index 00df0bfa4..cb2b267e8 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DtmfInput.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/DtmfInput.java
@@ -231,10 +231,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getDigitsBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(digits_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, digits_);
     }
-    if (!getFinishDigitBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(finishDigit_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, finishDigit_);
     }
     unknownFields.writeTo(output);
@@ -246,10 +246,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getDigitsBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(digits_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, digits_);
     }
-    if (!getFinishDigitBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(finishDigit_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, finishDigit_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EntityType.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EntityType.java
index e97f598b9..450e45309 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EntityType.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EntityType.java
@@ -903,7 +903,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getValueBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(value_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, value_);
       }
       for (int i = 0; i < synonyms_.size(); i++) {
@@ -918,7 +918,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getValueBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(value_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, value_);
       }
       {
@@ -1831,7 +1831,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getValueBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(value_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, value_);
       }
       unknownFields.writeTo(output);
@@ -1843,7 +1843,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getValueBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(value_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, value_);
       }
       size += unknownFields.getSerializedSize();
@@ -2706,10 +2706,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     if (kind_ != com.google.cloud.dialogflow.cx.v3.EntityType.Kind.KIND_UNSPECIFIED.getNumber()) {
@@ -2742,10 +2742,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     if (kind_ != com.google.cloud.dialogflow.cx.v3.EntityType.Kind.KIND_UNSPECIFIED.getNumber()) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Environment.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Environment.java
index bc6d67768..ebfc3f004 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Environment.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Environment.java
@@ -384,7 +384,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getVersionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, version_);
       }
       unknownFields.writeTo(output);
@@ -396,7 +396,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getVersionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, version_);
       }
       size += unknownFields.getSerializedSize();
@@ -2272,13 +2272,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, description_);
     }
     if (updateTime_ != null) {
@@ -2299,13 +2299,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, description_);
     }
     if (updateTime_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EventHandler.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EventHandler.java
index 0a8daa55b..e9c109456 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EventHandler.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EventHandler.java
@@ -532,13 +532,13 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (targetCase_ == 3) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, target_);
     }
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, event_);
     }
     if (triggerFulfillment_ != null) {
       output.writeMessage(5, getTriggerFulfillment());
     }
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, name_);
     }
     unknownFields.writeTo(output);
@@ -556,13 +556,13 @@ public int getSerializedSize() {
     if (targetCase_ == 3) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, target_);
     }
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, event_);
     }
     if (triggerFulfillment_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(5, getTriggerFulfillment());
     }
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EventInput.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EventInput.java
index 829ccf6e8..6ff9d15fe 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EventInput.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/EventInput.java
@@ -174,7 +174,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, event_);
     }
     unknownFields.writeTo(output);
@@ -186,7 +186,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, event_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Experiment.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Experiment.java
index 2f61be1df..ecf40078f 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Experiment.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Experiment.java
@@ -853,7 +853,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getConditionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, condition_);
       }
       if (variantsCase_ == 2) {
@@ -868,7 +868,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getConditionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, condition_);
       }
       if (variantsCase_ == 2) {
@@ -5167,7 +5167,7 @@ public final boolean isInitialized() {
 
       @java.lang.Override
       public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-        if (!getVersionBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 1, version_);
         }
         for (int i = 0; i < metrics_.size(); i++) {
@@ -5185,7 +5185,7 @@ public int getSerializedSize() {
         if (size != -1) return size;
 
         size = 0;
-        if (!getVersionBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, version_);
         }
         for (int i = 0; i < metrics_.size(); i++) {
@@ -8152,13 +8152,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, description_);
     }
     if (state_
@@ -8195,7 +8195,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (rolloutState_ != null) {
       output.writeMessage(15, getRolloutState());
     }
-    if (!getRolloutFailureReasonBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(rolloutFailureReason_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 16, rolloutFailureReason_);
     }
     unknownFields.writeTo(output);
@@ -8207,13 +8207,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, description_);
     }
     if (state_
@@ -8250,7 +8250,7 @@ public int getSerializedSize() {
     if (rolloutState_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(15, getRolloutState());
     }
-    if (!getRolloutFailureReasonBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(rolloutFailureReason_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(16, rolloutFailureReason_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportAgentRequest.java
index 718e69bc0..9773a6f9b 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportAgentRequest.java
@@ -308,13 +308,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getAgentUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agentUri_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, agentUri_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, environment_);
     }
     unknownFields.writeTo(output);
@@ -326,13 +326,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getAgentUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agentUri_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, agentUri_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, environment_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportFlowRequest.java
index cc60dfb9f..1391e1906 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportFlowRequest.java
@@ -268,10 +268,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getFlowUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowUri_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, flowUri_);
     }
     if (includeReferencedFlows_ != false) {
@@ -286,10 +286,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getFlowUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowUri_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, flowUri_);
     }
     if (includeReferencedFlows_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportTestCasesRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportTestCasesRequest.java
index b73a3d604..9bee314d5 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportTestCasesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ExportTestCasesRequest.java
@@ -586,7 +586,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (destinationCase_ == 2) {
@@ -598,7 +598,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(3, dataFormat_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, filter_);
     }
     unknownFields.writeTo(output);
@@ -610,7 +610,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (destinationCase_ == 2) {
@@ -622,7 +622,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(3, dataFormat_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, filter_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Flow.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Flow.java
index e143ee73c..67bf918c2 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Flow.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Flow.java
@@ -751,13 +751,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, description_);
     }
     for (int i = 0; i < transitionRoutes_.size(); i++) {
@@ -782,13 +782,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, description_);
     }
     for (int i = 0; i < transitionRoutes_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/FlowValidationResult.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/FlowValidationResult.java
index 10345510c..042fdfcd2 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/FlowValidationResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/FlowValidationResult.java
@@ -328,7 +328,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     for (int i = 0; i < validationMessages_.size(); i++) {
@@ -346,7 +346,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     for (int i = 0; i < validationMessages_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Form.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Form.java
index 5ad0d80ad..caf209e17 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Form.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Form.java
@@ -2916,13 +2916,13 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, displayName_);
       }
       if (required_ != false) {
         output.writeBool(2, required_);
       }
-      if (!getEntityTypeBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(entityType_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 3, entityType_);
       }
       if (isList_ != false) {
@@ -2946,13 +2946,13 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, displayName_);
       }
       if (required_ != false) {
         size += com.google.protobuf.CodedOutputStream.computeBoolSize(2, required_);
       }
-      if (!getEntityTypeBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(entityType_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, entityType_);
       }
       if (isList_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/FulfillIntentResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/FulfillIntentResponse.java
index 0d1307818..f2aab638c 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/FulfillIntentResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/FulfillIntentResponse.java
@@ -339,7 +339,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(responseId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, responseId_);
     }
     if (queryResult_ != null) {
@@ -360,7 +360,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(responseId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, responseId_);
     }
     if (queryResult_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Fulfillment.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Fulfillment.java
index 8e02f87a0..9abbf38c4 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Fulfillment.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Fulfillment.java
@@ -467,7 +467,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getParameterBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parameter_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parameter_);
       }
       if (value_ != null) {
@@ -482,7 +482,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getParameterBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parameter_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parameter_);
       }
       if (value_ != null) {
@@ -3026,7 +3026,7 @@ public final boolean isInitialized() {
 
       @java.lang.Override
       public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-        if (!getConditionBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 1, condition_);
         }
         for (int i = 0; i < caseContent_.size(); i++) {
@@ -3041,7 +3041,7 @@ public int getSerializedSize() {
         if (size != -1) return size;
 
         size = 0;
-        if (!getConditionBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, condition_);
         }
         for (int i = 0; i < caseContent_.size(); i++) {
@@ -5309,10 +5309,10 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < messages_.size(); i++) {
       output.writeMessage(1, messages_.get(i));
     }
-    if (!getWebhookBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(webhook_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, webhook_);
     }
-    if (!getTagBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(tag_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, tag_);
     }
     for (int i = 0; i < setParameterActions_.size(); i++) {
@@ -5336,10 +5336,10 @@ public int getSerializedSize() {
     for (int i = 0; i < messages_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, messages_.get(i));
     }
-    if (!getWebhookBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(webhook_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, webhook_);
     }
-    if (!getTagBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(tag_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, tag_);
     }
     for (int i = 0; i < setParameterActions_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetAgentRequest.java
index 73599b496..53d86d7e5 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetAgentRequest.java
@@ -180,7 +180,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -192,7 +192,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetAgentValidationResultRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetAgentValidationResultRequest.java
index 2d5c8978e..55515bcc9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetAgentValidationResultRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetAgentValidationResultRequest.java
@@ -240,10 +240,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -255,10 +255,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetChangelogRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetChangelogRequest.java
new file mode 100644
index 000000000..f00cfb3ed
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetChangelogRequest.java
@@ -0,0 +1,665 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3;
+
+/**
+ *
+ *
+ * <pre>
+ * The request message for [Changelogs.GetChangelog][google.cloud.dialogflow.cx.v3.Changelogs.GetChangelog].
+ * </pre>
+ *
+ * Protobuf type {@code google.cloud.dialogflow.cx.v3.GetChangelogRequest}
+ */
+public final class GetChangelogRequest extends com.google.protobuf.GeneratedMessageV3
+    implements
+    // @@protoc_insertion_point(message_implements:google.cloud.dialogflow.cx.v3.GetChangelogRequest)
+    GetChangelogRequestOrBuilder {
+  private static final long serialVersionUID = 0L;
+  // Use GetChangelogRequest.newBuilder() to construct.
+  private GetChangelogRequest(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+    super(builder);
+  }
+
+  private GetChangelogRequest() {
+    name_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+    return new GetChangelogRequest();
+  }
+
+  @java.lang.Override
+  public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+    return this.unknownFields;
+  }
+
+  private GetChangelogRequest(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    this();
+    if (extensionRegistry == null) {
+      throw new java.lang.NullPointerException();
+    }
+    com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+        com.google.protobuf.UnknownFieldSet.newBuilder();
+    try {
+      boolean done = false;
+      while (!done) {
+        int tag = input.readTag();
+        switch (tag) {
+          case 0:
+            done = true;
+            break;
+          case 10:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              name_ = s;
+              break;
+            }
+          default:
+            {
+              if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+        }
+      }
+    } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+      throw e.setUnfinishedMessage(this);
+    } catch (java.io.IOException e) {
+      throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+    } finally {
+      this.unknownFields = unknownFields.build();
+      makeExtensionsImmutable();
+    }
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+    return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3_GetChangelogRequest_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3_GetChangelogRequest_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            com.google.cloud.dialogflow.cx.v3.GetChangelogRequest.class,
+            com.google.cloud.dialogflow.cx.v3.GetChangelogRequest.Builder.class);
+  }
+
+  public static final int NAME_FIELD_NUMBER = 1;
+  private volatile java.lang.Object name_;
+  /**
+   *
+   *
+   * <pre>
+   * Required. The name of the changelog to get.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The name.
+   */
+  @java.lang.Override
+  public java.lang.String getName() {
+    java.lang.Object ref = name_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      name_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Required. The name of the changelog to get.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The bytes for name.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getNameBytes() {
+    java.lang.Object ref = name_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      name_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  private byte memoizedIsInitialized = -1;
+
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
+    }
+    unknownFields.writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
+    }
+    size += unknownFields.getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (!(obj instanceof com.google.cloud.dialogflow.cx.v3.GetChangelogRequest)) {
+      return super.equals(obj);
+    }
+    com.google.cloud.dialogflow.cx.v3.GetChangelogRequest other =
+        (com.google.cloud.dialogflow.cx.v3.GetChangelogRequest) obj;
+
+    if (!getName().equals(other.getName())) return false;
+    if (!unknownFields.equals(other.unknownFields)) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    hash = (37 * hash) + NAME_FIELD_NUMBER;
+    hash = (53 * hash) + getName().hashCode();
+    hash = (29 * hash) + unknownFields.hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseFrom(
+      java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseFrom(
+      java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseFrom(
+      byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseDelimitedFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseDelimitedFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseFrom(
+      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() {
+    return newBuilder();
+  }
+
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+
+  public static Builder newBuilder(
+      com.google.cloud.dialogflow.cx.v3.GetChangelogRequest prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The request message for [Changelogs.GetChangelog][google.cloud.dialogflow.cx.v3.Changelogs.GetChangelog].
+   * </pre>
+   *
+   * Protobuf type {@code google.cloud.dialogflow.cx.v3.GetChangelogRequest}
+   */
+  public static final class Builder extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+      implements
+      // @@protoc_insertion_point(builder_implements:google.cloud.dialogflow.cx.v3.GetChangelogRequest)
+      com.google.cloud.dialogflow.cx.v3.GetChangelogRequestOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_GetChangelogRequest_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_GetChangelogRequest_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              com.google.cloud.dialogflow.cx.v3.GetChangelogRequest.class,
+              com.google.cloud.dialogflow.cx.v3.GetChangelogRequest.Builder.class);
+    }
+
+    // Construct using com.google.cloud.dialogflow.cx.v3.GetChangelogRequest.newBuilder()
+    private Builder() {
+      maybeForceBuilderInitialization();
+    }
+
+    private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+      maybeForceBuilderInitialization();
+    }
+
+    private void maybeForceBuilderInitialization() {
+      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+    }
+
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      name_ = "";
+
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_GetChangelogRequest_descriptor;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.GetChangelogRequest getDefaultInstanceForType() {
+      return com.google.cloud.dialogflow.cx.v3.GetChangelogRequest.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.GetChangelogRequest build() {
+      com.google.cloud.dialogflow.cx.v3.GetChangelogRequest result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.GetChangelogRequest buildPartial() {
+      com.google.cloud.dialogflow.cx.v3.GetChangelogRequest result =
+          new com.google.cloud.dialogflow.cx.v3.GetChangelogRequest(this);
+      result.name_ = name_;
+      onBuilt();
+      return result;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.setField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+
+    @java.lang.Override
+    public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof com.google.cloud.dialogflow.cx.v3.GetChangelogRequest) {
+        return mergeFrom((com.google.cloud.dialogflow.cx.v3.GetChangelogRequest) other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(com.google.cloud.dialogflow.cx.v3.GetChangelogRequest other) {
+      if (other == com.google.cloud.dialogflow.cx.v3.GetChangelogRequest.getDefaultInstance())
+        return this;
+      if (!other.getName().isEmpty()) {
+        name_ = other.name_;
+        onChanged();
+      }
+      this.mergeUnknownFields(other.unknownFields);
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      com.google.cloud.dialogflow.cx.v3.GetChangelogRequest parsedMessage = null;
+      try {
+        parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        parsedMessage =
+            (com.google.cloud.dialogflow.cx.v3.GetChangelogRequest) e.getUnfinishedMessage();
+        throw e.unwrapIOException();
+      } finally {
+        if (parsedMessage != null) {
+          mergeFrom(parsedMessage);
+        }
+      }
+      return this;
+    }
+
+    private java.lang.Object name_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * Required. The name of the changelog to get.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return The name.
+     */
+    public java.lang.String getName() {
+      java.lang.Object ref = name_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        name_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The name of the changelog to get.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return The bytes for name.
+     */
+    public com.google.protobuf.ByteString getNameBytes() {
+      java.lang.Object ref = name_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        name_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The name of the changelog to get.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @param value The name to set.
+     * @return This builder for chaining.
+     */
+    public Builder setName(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      name_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The name of the changelog to get.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearName() {
+
+      name_ = getDefaultInstance().getName();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The name of the changelog to get.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @param value The bytes for name to set.
+     * @return This builder for chaining.
+     */
+    public Builder setNameBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      name_ = value;
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+    // @@protoc_insertion_point(builder_scope:google.cloud.dialogflow.cx.v3.GetChangelogRequest)
+  }
+
+  // @@protoc_insertion_point(class_scope:google.cloud.dialogflow.cx.v3.GetChangelogRequest)
+  private static final com.google.cloud.dialogflow.cx.v3.GetChangelogRequest DEFAULT_INSTANCE;
+
+  static {
+    DEFAULT_INSTANCE = new com.google.cloud.dialogflow.cx.v3.GetChangelogRequest();
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.GetChangelogRequest getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser<GetChangelogRequest> PARSER =
+      new com.google.protobuf.AbstractParser<GetChangelogRequest>() {
+        @java.lang.Override
+        public GetChangelogRequest parsePartialFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws com.google.protobuf.InvalidProtocolBufferException {
+          return new GetChangelogRequest(input, extensionRegistry);
+        }
+      };
+
+  public static com.google.protobuf.Parser<GetChangelogRequest> parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser<GetChangelogRequest> getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3.GetChangelogRequest getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetChangelogRequestOrBuilder.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetChangelogRequestOrBuilder.java
new file mode 100644
index 000000000..19cae4d4a
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetChangelogRequestOrBuilder.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3;
+
+public interface GetChangelogRequestOrBuilder
+    extends
+    // @@protoc_insertion_point(interface_extends:google.cloud.dialogflow.cx.v3.GetChangelogRequest)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   *
+   *
+   * <pre>
+   * Required. The name of the changelog to get.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The name.
+   */
+  java.lang.String getName();
+  /**
+   *
+   *
+   * <pre>
+   * Required. The name of the changelog to get.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The bytes for name.
+   */
+  com.google.protobuf.ByteString getNameBytes();
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetDeploymentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetDeploymentRequest.java
index 33de61e13..042b5c697 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetDeploymentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetDeploymentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetEntityTypeRequest.java
index e768a380e..e8b8fea43 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetEntityTypeRequest.java
@@ -257,10 +257,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -272,10 +272,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetEnvironmentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetEnvironmentRequest.java
index 330c113b5..15aa46afa 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetEnvironmentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetEnvironmentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetExperimentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetExperimentRequest.java
index 5a7f0cdee..9836dd7df 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetExperimentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetExperimentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetFlowRequest.java
index ad80d610e..147426e54 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetFlowRequest.java
@@ -259,10 +259,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -274,10 +274,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetFlowValidationResultRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetFlowValidationResultRequest.java
index e8de9778c..0f4f16ce0 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetFlowValidationResultRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetFlowValidationResultRequest.java
@@ -240,10 +240,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -255,10 +255,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetIntentRequest.java
index 1fa8efdb9..397fb5bad 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetIntentRequest.java
@@ -253,10 +253,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -268,10 +268,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetPageRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetPageRequest.java
index b3452cf13..535177ee9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetPageRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetPageRequest.java
@@ -275,10 +275,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -290,10 +290,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetSecuritySettingsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetSecuritySettingsRequest.java
index f02d38637..6e774959a 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetSecuritySettingsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetSecuritySettingsRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetSessionEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetSessionEntityTypeRequest.java
index 11d2a13bb..3317d5cd7 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetSessionEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetSessionEntityTypeRequest.java
@@ -190,7 +190,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -202,7 +202,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTestCaseRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTestCaseRequest.java
index a51d9b0fc..bb926a04b 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTestCaseRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTestCaseRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTestCaseResultRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTestCaseResultRequest.java
index 9dc6d8e98..b5d94ba7c 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTestCaseResultRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTestCaseResultRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTransitionRouteGroupRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTransitionRouteGroupRequest.java
index 3661dd68c..8229a37de 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTransitionRouteGroupRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetTransitionRouteGroupRequest.java
@@ -258,10 +258,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -273,10 +273,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetVersionRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetVersionRequest.java
index 1d0d0551e..96916ad69 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetVersionRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetVersionRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetWebhookRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetWebhookRequest.java
index 0ab8824fd..69db399b7 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetWebhookRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/GetWebhookRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportFlowRequest.java
index 558acaedb..8dbc8b727 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportFlowRequest.java
@@ -564,7 +564,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (flowCase_ == 2) {
@@ -588,7 +588,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (flowCase_ == 2) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportFlowResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportFlowResponse.java
index e7da1fea1..f69064b08 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportFlowResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportFlowResponse.java
@@ -178,7 +178,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flow_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, flow_);
     }
     unknownFields.writeTo(output);
@@ -190,7 +190,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flow_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, flow_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportTestCasesRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportTestCasesRequest.java
index 144176f94..c3d9c09d1 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportTestCasesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ImportTestCasesRequest.java
@@ -351,7 +351,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (sourceCase_ == 2) {
@@ -369,7 +369,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (sourceCase_ == 2) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/InputAudioConfig.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/InputAudioConfig.java
index d14d96c33..1ee74bcf0 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/InputAudioConfig.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/InputAudioConfig.java
@@ -473,7 +473,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < phraseHints_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, phraseHints_.getRaw(i));
     }
-    if (!getModelBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(model_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 7, model_);
     }
     if (singleUtterance_ != false) {
@@ -511,7 +511,7 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getPhraseHintsList().size();
     }
-    if (!getModelBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(model_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, model_);
     }
     if (singleUtterance_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Intent.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Intent.java
index dbe9da6ed..e7e23aea0 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Intent.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Intent.java
@@ -760,10 +760,10 @@ public final boolean isInitialized() {
 
       @java.lang.Override
       public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-        if (!getTextBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(text_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 1, text_);
         }
-        if (!getParameterIdBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parameterId_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 2, parameterId_);
         }
         unknownFields.writeTo(output);
@@ -775,10 +775,10 @@ public int getSerializedSize() {
         if (size != -1) return size;
 
         size = 0;
-        if (!getTextBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(text_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, text_);
         }
-        if (!getParameterIdBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parameterId_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, parameterId_);
         }
         size += unknownFields.getSerializedSize();
@@ -1589,7 +1589,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getIdBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, id_);
       }
       for (int i = 0; i < parts_.size(); i++) {
@@ -1607,7 +1607,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getIdBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, id_);
       }
       for (int i = 0; i < parts_.size(); i++) {
@@ -3185,10 +3185,10 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getIdBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, id_);
       }
-      if (!getEntityTypeBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(entityType_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 2, entityType_);
       }
       if (isList_ != false) {
@@ -3206,10 +3206,10 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getIdBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, id_);
       }
-      if (!getEntityTypeBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(entityType_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, entityType_);
       }
       if (isList_ != false) {
@@ -4474,10 +4474,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     for (int i = 0; i < trainingPhrases_.size(); i++) {
@@ -4494,7 +4494,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     }
     com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
         output, internalGetLabels(), LabelsDefaultEntryHolder.defaultEntry, 7);
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 8, description_);
     }
     unknownFields.writeTo(output);
@@ -4506,10 +4506,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     for (int i = 0; i < trainingPhrases_.size(); i++) {
@@ -4534,7 +4534,7 @@ public int getSerializedSize() {
               .build();
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(7, labels__);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(8, description_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/IntentCoverage.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/IntentCoverage.java
index 48b982093..4906ca8bc 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/IntentCoverage.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/IntentCoverage.java
@@ -352,7 +352,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getIntentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, intent_);
       }
       if (covered_ != false) {
@@ -367,7 +367,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getIntentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, intent_);
       }
       if (covered_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/IntentInput.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/IntentInput.java
index bb8740c89..119539c35 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/IntentInput.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/IntentInput.java
@@ -183,7 +183,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getIntentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, intent_);
     }
     unknownFields.writeTo(output);
@@ -195,7 +195,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getIntentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, intent_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListAgentsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListAgentsRequest.java
index 5930e05b2..315d2d44e 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListAgentsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListAgentsRequest.java
@@ -261,13 +261,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -279,13 +279,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListAgentsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListAgentsResponse.java
index e365ae2fd..59c5246f9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListAgentsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListAgentsResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < agents_.size(); i++) {
       output.writeMessage(1, agents_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < agents_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, agents_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsRequest.java
new file mode 100644
index 000000000..e585f9279
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsRequest.java
@@ -0,0 +1,1243 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3;
+
+/**
+ *
+ *
+ * <pre>
+ * The request message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3.Changelogs.ListChangelogs].
+ * </pre>
+ *
+ * Protobuf type {@code google.cloud.dialogflow.cx.v3.ListChangelogsRequest}
+ */
+public final class ListChangelogsRequest extends com.google.protobuf.GeneratedMessageV3
+    implements
+    // @@protoc_insertion_point(message_implements:google.cloud.dialogflow.cx.v3.ListChangelogsRequest)
+    ListChangelogsRequestOrBuilder {
+  private static final long serialVersionUID = 0L;
+  // Use ListChangelogsRequest.newBuilder() to construct.
+  private ListChangelogsRequest(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+    super(builder);
+  }
+
+  private ListChangelogsRequest() {
+    parent_ = "";
+    filter_ = "";
+    pageToken_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+    return new ListChangelogsRequest();
+  }
+
+  @java.lang.Override
+  public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+    return this.unknownFields;
+  }
+
+  private ListChangelogsRequest(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    this();
+    if (extensionRegistry == null) {
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+  /**
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+   * <pre>
+   * Required. The agent containing the changelogs.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
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+   * <pre>
+   * Required. The agent containing the changelogs.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
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+   * The filter string. Supports filter by user_email, resource, type and
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+   *        resource = "projects/123/locations/global/agents/456/flows/789"
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+   *   4. By action:
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+   *   5. By type:
+   *        type = "flows"
+   *   6. By create time. Currently predicates on `create_time` and
+   *      `create_time_epoch_seconds` are supported:
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+   *        2017-01-15T01:30:15.01Z
+   *   7. Combination of above filters:
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+   * The filter string. Supports filter by user_email, resource, type and
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+   *   1. By user email:
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+   *   2. By resource name:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *   3. By resource display name:
+   *        display_name = "my agent"
+   *   4. By action:
+   *        action = "Create"
+   *   5. By type:
+   *        type = "flows"
+   *   6. By create time. Currently predicates on `create_time` and
+   *      `create_time_epoch_seconds` are supported:
+   *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+   *        2017-01-15T01:30:15.01Z
+   *   7. Combination of above filters:
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+   * </pre>
+   *
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+   *
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+   *
+   * <pre>
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+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
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+    size = 0;
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
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+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (!(obj instanceof com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest)) {
+      return super.equals(obj);
+    }
+    com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest other =
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+    if (!getParent().equals(other.getParent())) return false;
+    if (!getFilter().equals(other.getFilter())) return false;
+    if (getPageSize() != other.getPageSize()) return false;
+    if (!getPageToken().equals(other.getPageToken())) return false;
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+    return true;
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+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
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+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
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+    hash = (53 * hash) + getParent().hashCode();
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+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseFrom(
+      java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseFrom(
+      java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseFrom(
+      byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseDelimitedFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseDelimitedFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseFrom(
+      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() {
+    return newBuilder();
+  }
+
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+
+  public static Builder newBuilder(
+      com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The request message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3.Changelogs.ListChangelogs].
+   * </pre>
+   *
+   * Protobuf type {@code google.cloud.dialogflow.cx.v3.ListChangelogsRequest}
+   */
+  public static final class Builder extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+      implements
+      // @@protoc_insertion_point(builder_implements:google.cloud.dialogflow.cx.v3.ListChangelogsRequest)
+      com.google.cloud.dialogflow.cx.v3.ListChangelogsRequestOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsRequest_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsRequest_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest.class,
+              com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest.Builder.class);
+    }
+
+    // Construct using com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest.newBuilder()
+    private Builder() {
+      maybeForceBuilderInitialization();
+    }
+
+    private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+      maybeForceBuilderInitialization();
+    }
+
+    private void maybeForceBuilderInitialization() {
+      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+    }
+
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      parent_ = "";
+
+      filter_ = "";
+
+      pageSize_ = 0;
+
+      pageToken_ = "";
+
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsRequest_descriptor;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest getDefaultInstanceForType() {
+      return com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest build() {
+      com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest buildPartial() {
+      com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest result =
+          new com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest(this);
+      result.parent_ = parent_;
+      result.filter_ = filter_;
+      result.pageSize_ = pageSize_;
+      result.pageToken_ = pageToken_;
+      onBuilt();
+      return result;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.setField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+
+    @java.lang.Override
+    public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
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+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.addRepeatedField(field, value);
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+
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest) {
+        return mergeFrom((com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest) other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest other) {
+      if (other == com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest.getDefaultInstance())
+        return this;
+      if (!other.getParent().isEmpty()) {
+        parent_ = other.parent_;
+        onChanged();
+      }
+      if (!other.getFilter().isEmpty()) {
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+      if (other.getPageSize() != 0) {
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+      if (!other.getPageToken().isEmpty()) {
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+      this.mergeUnknownFields(other.unknownFields);
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest parsedMessage = null;
+      try {
+        parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        parsedMessage =
+            (com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest) e.getUnfinishedMessage();
+        throw e.unwrapIOException();
+      } finally {
+        if (parsedMessage != null) {
+          mergeFrom(parsedMessage);
+        }
+      }
+      return this;
+    }
+
+    private java.lang.Object parent_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * Required. The agent containing the changelogs.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return The parent.
+     */
+    public java.lang.String getParent() {
+      java.lang.Object ref = parent_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        parent_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The agent containing the changelogs.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return The bytes for parent.
+     */
+    public com.google.protobuf.ByteString getParentBytes() {
+      java.lang.Object ref = parent_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        parent_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The agent containing the changelogs.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @param value The parent to set.
+     * @return This builder for chaining.
+     */
+    public Builder setParent(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      parent_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The agent containing the changelogs.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearParent() {
+
+      parent_ = getDefaultInstance().getParent();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The agent containing the changelogs.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @param value The bytes for parent to set.
+     * @return This builder for chaining.
+     */
+    public Builder setParentBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      parent_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object filter_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The filter string. Supports filter by user_email, resource, type and
+     * create_time. Some examples:
+     *   1. By user email:
+     *        user_email = "someone&#64;google.com"
+     *   2. By resource name:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *   3. By resource display name:
+     *        display_name = "my agent"
+     *   4. By action:
+     *        action = "Create"
+     *   5. By type:
+     *        type = "flows"
+     *   6. By create time. Currently predicates on `create_time` and
+     *      `create_time_epoch_seconds` are supported:
+     *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+     *        2017-01-15T01:30:15.01Z
+     *   7. Combination of above filters:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *          AND user_email = "someone&#64;google.com"
+     *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+     * </pre>
+     *
+     * <code>string filter = 2;</code>
+     *
+     * @return The filter.
+     */
+    public java.lang.String getFilter() {
+      java.lang.Object ref = filter_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        filter_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The filter string. Supports filter by user_email, resource, type and
+     * create_time. Some examples:
+     *   1. By user email:
+     *        user_email = "someone&#64;google.com"
+     *   2. By resource name:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *   3. By resource display name:
+     *        display_name = "my agent"
+     *   4. By action:
+     *        action = "Create"
+     *   5. By type:
+     *        type = "flows"
+     *   6. By create time. Currently predicates on `create_time` and
+     *      `create_time_epoch_seconds` are supported:
+     *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+     *        2017-01-15T01:30:15.01Z
+     *   7. Combination of above filters:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *          AND user_email = "someone&#64;google.com"
+     *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+     * </pre>
+     *
+     * <code>string filter = 2;</code>
+     *
+     * @return The bytes for filter.
+     */
+    public com.google.protobuf.ByteString getFilterBytes() {
+      java.lang.Object ref = filter_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        filter_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The filter string. Supports filter by user_email, resource, type and
+     * create_time. Some examples:
+     *   1. By user email:
+     *        user_email = "someone&#64;google.com"
+     *   2. By resource name:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *   3. By resource display name:
+     *        display_name = "my agent"
+     *   4. By action:
+     *        action = "Create"
+     *   5. By type:
+     *        type = "flows"
+     *   6. By create time. Currently predicates on `create_time` and
+     *      `create_time_epoch_seconds` are supported:
+     *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+     *        2017-01-15T01:30:15.01Z
+     *   7. Combination of above filters:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *          AND user_email = "someone&#64;google.com"
+     *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+     * </pre>
+     *
+     * <code>string filter = 2;</code>
+     *
+     * @param value The filter to set.
+     * @return This builder for chaining.
+     */
+    public Builder setFilter(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      filter_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The filter string. Supports filter by user_email, resource, type and
+     * create_time. Some examples:
+     *   1. By user email:
+     *        user_email = "someone&#64;google.com"
+     *   2. By resource name:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *   3. By resource display name:
+     *        display_name = "my agent"
+     *   4. By action:
+     *        action = "Create"
+     *   5. By type:
+     *        type = "flows"
+     *   6. By create time. Currently predicates on `create_time` and
+     *      `create_time_epoch_seconds` are supported:
+     *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+     *        2017-01-15T01:30:15.01Z
+     *   7. Combination of above filters:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *          AND user_email = "someone&#64;google.com"
+     *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+     * </pre>
+     *
+     * <code>string filter = 2;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearFilter() {
+
+      filter_ = getDefaultInstance().getFilter();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The filter string. Supports filter by user_email, resource, type and
+     * create_time. Some examples:
+     *   1. By user email:
+     *        user_email = "someone&#64;google.com"
+     *   2. By resource name:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *   3. By resource display name:
+     *        display_name = "my agent"
+     *   4. By action:
+     *        action = "Create"
+     *   5. By type:
+     *        type = "flows"
+     *   6. By create time. Currently predicates on `create_time` and
+     *      `create_time_epoch_seconds` are supported:
+     *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+     *        2017-01-15T01:30:15.01Z
+     *   7. Combination of above filters:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *          AND user_email = "someone&#64;google.com"
+     *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+     * </pre>
+     *
+     * <code>string filter = 2;</code>
+     *
+     * @param value The bytes for filter to set.
+     * @return This builder for chaining.
+     */
+    public Builder setFilterBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      filter_ = value;
+      onChanged();
+      return this;
+    }
+
+    private int pageSize_;
+    /**
+     *
+     *
+     * <pre>
+     * The maximum number of items to return in a single page. By default 100 and
+     * at most 1000.
+     * </pre>
+     *
+     * <code>int32 page_size = 3;</code>
+     *
+     * @return The pageSize.
+     */
+    @java.lang.Override
+    public int getPageSize() {
+      return pageSize_;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The maximum number of items to return in a single page. By default 100 and
+     * at most 1000.
+     * </pre>
+     *
+     * <code>int32 page_size = 3;</code>
+     *
+     * @param value The pageSize to set.
+     * @return This builder for chaining.
+     */
+    public Builder setPageSize(int value) {
+
+      pageSize_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The maximum number of items to return in a single page. By default 100 and
+     * at most 1000.
+     * </pre>
+     *
+     * <code>int32 page_size = 3;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearPageSize() {
+
+      pageSize_ = 0;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object pageToken_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The next_page_token value returned from a previous list request.
+     * </pre>
+     *
+     * <code>string page_token = 4;</code>
+     *
+     * @return The pageToken.
+     */
+    public java.lang.String getPageToken() {
+      java.lang.Object ref = pageToken_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        pageToken_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The next_page_token value returned from a previous list request.
+     * </pre>
+     *
+     * <code>string page_token = 4;</code>
+     *
+     * @return The bytes for pageToken.
+     */
+    public com.google.protobuf.ByteString getPageTokenBytes() {
+      java.lang.Object ref = pageToken_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        pageToken_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The next_page_token value returned from a previous list request.
+     * </pre>
+     *
+     * <code>string page_token = 4;</code>
+     *
+     * @param value The pageToken to set.
+     * @return This builder for chaining.
+     */
+    public Builder setPageToken(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      pageToken_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The next_page_token value returned from a previous list request.
+     * </pre>
+     *
+     * <code>string page_token = 4;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearPageToken() {
+
+      pageToken_ = getDefaultInstance().getPageToken();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The next_page_token value returned from a previous list request.
+     * </pre>
+     *
+     * <code>string page_token = 4;</code>
+     *
+     * @param value The bytes for pageToken to set.
+     * @return This builder for chaining.
+     */
+    public Builder setPageTokenBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      pageToken_ = value;
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+    // @@protoc_insertion_point(builder_scope:google.cloud.dialogflow.cx.v3.ListChangelogsRequest)
+  }
+
+  // @@protoc_insertion_point(class_scope:google.cloud.dialogflow.cx.v3.ListChangelogsRequest)
+  private static final com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest DEFAULT_INSTANCE;
+
+  static {
+    DEFAULT_INSTANCE = new com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest();
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser<ListChangelogsRequest> PARSER =
+      new com.google.protobuf.AbstractParser<ListChangelogsRequest>() {
+        @java.lang.Override
+        public ListChangelogsRequest parsePartialFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws com.google.protobuf.InvalidProtocolBufferException {
+          return new ListChangelogsRequest(input, extensionRegistry);
+        }
+      };
+
+  public static com.google.protobuf.Parser<ListChangelogsRequest> parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser<ListChangelogsRequest> getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3.ListChangelogsRequest getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsRequestOrBuilder.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsRequestOrBuilder.java
new file mode 100644
index 000000000..d77d0524e
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsRequestOrBuilder.java
@@ -0,0 +1,158 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3;
+
+public interface ListChangelogsRequestOrBuilder
+    extends
+    // @@protoc_insertion_point(interface_extends:google.cloud.dialogflow.cx.v3.ListChangelogsRequest)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   *
+   *
+   * <pre>
+   * Required. The agent containing the changelogs.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The parent.
+   */
+  java.lang.String getParent();
+  /**
+   *
+   *
+   * <pre>
+   * Required. The agent containing the changelogs.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The bytes for parent.
+   */
+  com.google.protobuf.ByteString getParentBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The filter string. Supports filter by user_email, resource, type and
+   * create_time. Some examples:
+   *   1. By user email:
+   *        user_email = "someone&#64;google.com"
+   *   2. By resource name:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *   3. By resource display name:
+   *        display_name = "my agent"
+   *   4. By action:
+   *        action = "Create"
+   *   5. By type:
+   *        type = "flows"
+   *   6. By create time. Currently predicates on `create_time` and
+   *      `create_time_epoch_seconds` are supported:
+   *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+   *        2017-01-15T01:30:15.01Z
+   *   7. Combination of above filters:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *          AND user_email = "someone&#64;google.com"
+   *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+   * </pre>
+   *
+   * <code>string filter = 2;</code>
+   *
+   * @return The filter.
+   */
+  java.lang.String getFilter();
+  /**
+   *
+   *
+   * <pre>
+   * The filter string. Supports filter by user_email, resource, type and
+   * create_time. Some examples:
+   *   1. By user email:
+   *        user_email = "someone&#64;google.com"
+   *   2. By resource name:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *   3. By resource display name:
+   *        display_name = "my agent"
+   *   4. By action:
+   *        action = "Create"
+   *   5. By type:
+   *        type = "flows"
+   *   6. By create time. Currently predicates on `create_time` and
+   *      `create_time_epoch_seconds` are supported:
+   *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+   *        2017-01-15T01:30:15.01Z
+   *   7. Combination of above filters:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *          AND user_email = "someone&#64;google.com"
+   *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+   * </pre>
+   *
+   * <code>string filter = 2;</code>
+   *
+   * @return The bytes for filter.
+   */
+  com.google.protobuf.ByteString getFilterBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The maximum number of items to return in a single page. By default 100 and
+   * at most 1000.
+   * </pre>
+   *
+   * <code>int32 page_size = 3;</code>
+   *
+   * @return The pageSize.
+   */
+  int getPageSize();
+
+  /**
+   *
+   *
+   * <pre>
+   * The next_page_token value returned from a previous list request.
+   * </pre>
+   *
+   * <code>string page_token = 4;</code>
+   *
+   * @return The pageToken.
+   */
+  java.lang.String getPageToken();
+  /**
+   *
+   *
+   * <pre>
+   * The next_page_token value returned from a previous list request.
+   * </pre>
+   *
+   * <code>string page_token = 4;</code>
+   *
+   * @return The bytes for pageToken.
+   */
+  com.google.protobuf.ByteString getPageTokenBytes();
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsResponse.java
new file mode 100644
index 000000000..8abf9ade9
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsResponse.java
@@ -0,0 +1,1185 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3;
+
+/**
+ *
+ *
+ * <pre>
+ * The response message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3.Changelogs.ListChangelogs].
+ * </pre>
+ *
+ * Protobuf type {@code google.cloud.dialogflow.cx.v3.ListChangelogsResponse}
+ */
+public final class ListChangelogsResponse extends com.google.protobuf.GeneratedMessageV3
+    implements
+    // @@protoc_insertion_point(message_implements:google.cloud.dialogflow.cx.v3.ListChangelogsResponse)
+    ListChangelogsResponseOrBuilder {
+  private static final long serialVersionUID = 0L;
+  // Use ListChangelogsResponse.newBuilder() to construct.
+  private ListChangelogsResponse(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+    super(builder);
+  }
+
+  private ListChangelogsResponse() {
+    changelogs_ = java.util.Collections.emptyList();
+    nextPageToken_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+    return new ListChangelogsResponse();
+  }
+
+  @java.lang.Override
+  public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+    return this.unknownFields;
+  }
+
+  private ListChangelogsResponse(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    this();
+    if (extensionRegistry == null) {
+      throw new java.lang.NullPointerException();
+    }
+    int mutable_bitField0_ = 0;
+    com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+        com.google.protobuf.UnknownFieldSet.newBuilder();
+    try {
+      boolean done = false;
+      while (!done) {
+        int tag = input.readTag();
+        switch (tag) {
+          case 0:
+            done = true;
+            break;
+          case 10:
+            {
+              if (!((mutable_bitField0_ & 0x00000001) != 0)) {
+                changelogs_ =
+                    new java.util.ArrayList<com.google.cloud.dialogflow.cx.v3.Changelog>();
+                mutable_bitField0_ |= 0x00000001;
+              }
+              changelogs_.add(
+                  input.readMessage(
+                      com.google.cloud.dialogflow.cx.v3.Changelog.parser(), extensionRegistry));
+              break;
+            }
+          case 18:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              nextPageToken_ = s;
+              break;
+            }
+          default:
+            {
+              if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+        }
+      }
+    } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+      throw e.setUnfinishedMessage(this);
+    } catch (java.io.IOException e) {
+      throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+    } finally {
+      if (((mutable_bitField0_ & 0x00000001) != 0)) {
+        changelogs_ = java.util.Collections.unmodifiableList(changelogs_);
+      }
+      this.unknownFields = unknownFields.build();
+      makeExtensionsImmutable();
+    }
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+    return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsResponse_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsResponse_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse.class,
+            com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse.Builder.class);
+  }
+
+  public static final int CHANGELOGS_FIELD_NUMBER = 1;
+  private java.util.List<com.google.cloud.dialogflow.cx.v3.Changelog> changelogs_;
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+   */
+  @java.lang.Override
+  public java.util.List<com.google.cloud.dialogflow.cx.v3.Changelog> getChangelogsList() {
+    return changelogs_;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+   */
+  @java.lang.Override
+  public java.util.List<? extends com.google.cloud.dialogflow.cx.v3.ChangelogOrBuilder>
+      getChangelogsOrBuilderList() {
+    return changelogs_;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+   */
+  @java.lang.Override
+  public int getChangelogsCount() {
+    return changelogs_.size();
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+   */
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3.Changelog getChangelogs(int index) {
+    return changelogs_.get(index);
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+   */
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3.ChangelogOrBuilder getChangelogsOrBuilder(int index) {
+    return changelogs_.get(index);
+  }
+
+  public static final int NEXT_PAGE_TOKEN_FIELD_NUMBER = 2;
+  private volatile java.lang.Object nextPageToken_;
+  /**
+   *
+   *
+   * <pre>
+   * Token to retrieve the next page of results, or empty if there are no more
+   * results in the list.
+   * </pre>
+   *
+   * <code>string next_page_token = 2;</code>
+   *
+   * @return The nextPageToken.
+   */
+  @java.lang.Override
+  public java.lang.String getNextPageToken() {
+    java.lang.Object ref = nextPageToken_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      nextPageToken_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Token to retrieve the next page of results, or empty if there are no more
+   * results in the list.
+   * </pre>
+   *
+   * <code>string next_page_token = 2;</code>
+   *
+   * @return The bytes for nextPageToken.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getNextPageTokenBytes() {
+    java.lang.Object ref = nextPageToken_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      nextPageToken_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  private byte memoizedIsInitialized = -1;
+
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+    for (int i = 0; i < changelogs_.size(); i++) {
+      output.writeMessage(1, changelogs_.get(i));
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
+    }
+    unknownFields.writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    for (int i = 0; i < changelogs_.size(); i++) {
+      size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, changelogs_.get(i));
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
+    }
+    size += unknownFields.getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (!(obj instanceof com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse)) {
+      return super.equals(obj);
+    }
+    com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse other =
+        (com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse) obj;
+
+    if (!getChangelogsList().equals(other.getChangelogsList())) return false;
+    if (!getNextPageToken().equals(other.getNextPageToken())) return false;
+    if (!unknownFields.equals(other.unknownFields)) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    if (getChangelogsCount() > 0) {
+      hash = (37 * hash) + CHANGELOGS_FIELD_NUMBER;
+      hash = (53 * hash) + getChangelogsList().hashCode();
+    }
+    hash = (37 * hash) + NEXT_PAGE_TOKEN_FIELD_NUMBER;
+    hash = (53 * hash) + getNextPageToken().hashCode();
+    hash = (29 * hash) + unknownFields.hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseFrom(
+      java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseFrom(
+      java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseFrom(
+      byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseDelimitedFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseDelimitedFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseFrom(
+      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() {
+    return newBuilder();
+  }
+
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+
+  public static Builder newBuilder(
+      com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The response message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3.Changelogs.ListChangelogs].
+   * </pre>
+   *
+   * Protobuf type {@code google.cloud.dialogflow.cx.v3.ListChangelogsResponse}
+   */
+  public static final class Builder extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+      implements
+      // @@protoc_insertion_point(builder_implements:google.cloud.dialogflow.cx.v3.ListChangelogsResponse)
+      com.google.cloud.dialogflow.cx.v3.ListChangelogsResponseOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsResponse_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsResponse_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse.class,
+              com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse.Builder.class);
+    }
+
+    // Construct using com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse.newBuilder()
+    private Builder() {
+      maybeForceBuilderInitialization();
+    }
+
+    private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+      maybeForceBuilderInitialization();
+    }
+
+    private void maybeForceBuilderInitialization() {
+      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
+        getChangelogsFieldBuilder();
+      }
+    }
+
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      if (changelogsBuilder_ == null) {
+        changelogs_ = java.util.Collections.emptyList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+      } else {
+        changelogsBuilder_.clear();
+      }
+      nextPageToken_ = "";
+
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+      return com.google.cloud.dialogflow.cx.v3.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3_ListChangelogsResponse_descriptor;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse getDefaultInstanceForType() {
+      return com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse build() {
+      com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse buildPartial() {
+      com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse result =
+          new com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse(this);
+      int from_bitField0_ = bitField0_;
+      if (changelogsBuilder_ == null) {
+        if (((bitField0_ & 0x00000001) != 0)) {
+          changelogs_ = java.util.Collections.unmodifiableList(changelogs_);
+          bitField0_ = (bitField0_ & ~0x00000001);
+        }
+        result.changelogs_ = changelogs_;
+      } else {
+        result.changelogs_ = changelogsBuilder_.build();
+      }
+      result.nextPageToken_ = nextPageToken_;
+      onBuilt();
+      return result;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.setField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+
+    @java.lang.Override
+    public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse) {
+        return mergeFrom((com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse) other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse other) {
+      if (other == com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse.getDefaultInstance())
+        return this;
+      if (changelogsBuilder_ == null) {
+        if (!other.changelogs_.isEmpty()) {
+          if (changelogs_.isEmpty()) {
+            changelogs_ = other.changelogs_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+          } else {
+            ensureChangelogsIsMutable();
+            changelogs_.addAll(other.changelogs_);
+          }
+          onChanged();
+        }
+      } else {
+        if (!other.changelogs_.isEmpty()) {
+          if (changelogsBuilder_.isEmpty()) {
+            changelogsBuilder_.dispose();
+            changelogsBuilder_ = null;
+            changelogs_ = other.changelogs_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+            changelogsBuilder_ =
+                com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders
+                    ? getChangelogsFieldBuilder()
+                    : null;
+          } else {
+            changelogsBuilder_.addAllMessages(other.changelogs_);
+          }
+        }
+      }
+      if (!other.getNextPageToken().isEmpty()) {
+        nextPageToken_ = other.nextPageToken_;
+        onChanged();
+      }
+      this.mergeUnknownFields(other.unknownFields);
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse parsedMessage = null;
+      try {
+        parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        parsedMessage =
+            (com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse) e.getUnfinishedMessage();
+        throw e.unwrapIOException();
+      } finally {
+        if (parsedMessage != null) {
+          mergeFrom(parsedMessage);
+        }
+      }
+      return this;
+    }
+
+    private int bitField0_;
+
+    private java.util.List<com.google.cloud.dialogflow.cx.v3.Changelog> changelogs_ =
+        java.util.Collections.emptyList();
+
+    private void ensureChangelogsIsMutable() {
+      if (!((bitField0_ & 0x00000001) != 0)) {
+        changelogs_ =
+            new java.util.ArrayList<com.google.cloud.dialogflow.cx.v3.Changelog>(changelogs_);
+        bitField0_ |= 0x00000001;
+      }
+    }
+
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+            com.google.cloud.dialogflow.cx.v3.Changelog,
+            com.google.cloud.dialogflow.cx.v3.Changelog.Builder,
+            com.google.cloud.dialogflow.cx.v3.ChangelogOrBuilder>
+        changelogsBuilder_;
+
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public java.util.List<com.google.cloud.dialogflow.cx.v3.Changelog> getChangelogsList() {
+      if (changelogsBuilder_ == null) {
+        return java.util.Collections.unmodifiableList(changelogs_);
+      } else {
+        return changelogsBuilder_.getMessageList();
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public int getChangelogsCount() {
+      if (changelogsBuilder_ == null) {
+        return changelogs_.size();
+      } else {
+        return changelogsBuilder_.getCount();
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public com.google.cloud.dialogflow.cx.v3.Changelog getChangelogs(int index) {
+      if (changelogsBuilder_ == null) {
+        return changelogs_.get(index);
+      } else {
+        return changelogsBuilder_.getMessage(index);
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public Builder setChangelogs(int index, com.google.cloud.dialogflow.cx.v3.Changelog value) {
+      if (changelogsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureChangelogsIsMutable();
+        changelogs_.set(index, value);
+        onChanged();
+      } else {
+        changelogsBuilder_.setMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public Builder setChangelogs(
+        int index, com.google.cloud.dialogflow.cx.v3.Changelog.Builder builderForValue) {
+      if (changelogsBuilder_ == null) {
+        ensureChangelogsIsMutable();
+        changelogs_.set(index, builderForValue.build());
+        onChanged();
+      } else {
+        changelogsBuilder_.setMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public Builder addChangelogs(com.google.cloud.dialogflow.cx.v3.Changelog value) {
+      if (changelogsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureChangelogsIsMutable();
+        changelogs_.add(value);
+        onChanged();
+      } else {
+        changelogsBuilder_.addMessage(value);
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public Builder addChangelogs(int index, com.google.cloud.dialogflow.cx.v3.Changelog value) {
+      if (changelogsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureChangelogsIsMutable();
+        changelogs_.add(index, value);
+        onChanged();
+      } else {
+        changelogsBuilder_.addMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public Builder addChangelogs(
+        com.google.cloud.dialogflow.cx.v3.Changelog.Builder builderForValue) {
+      if (changelogsBuilder_ == null) {
+        ensureChangelogsIsMutable();
+        changelogs_.add(builderForValue.build());
+        onChanged();
+      } else {
+        changelogsBuilder_.addMessage(builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public Builder addChangelogs(
+        int index, com.google.cloud.dialogflow.cx.v3.Changelog.Builder builderForValue) {
+      if (changelogsBuilder_ == null) {
+        ensureChangelogsIsMutable();
+        changelogs_.add(index, builderForValue.build());
+        onChanged();
+      } else {
+        changelogsBuilder_.addMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public Builder addAllChangelogs(
+        java.lang.Iterable<? extends com.google.cloud.dialogflow.cx.v3.Changelog> values) {
+      if (changelogsBuilder_ == null) {
+        ensureChangelogsIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, changelogs_);
+        onChanged();
+      } else {
+        changelogsBuilder_.addAllMessages(values);
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public Builder clearChangelogs() {
+      if (changelogsBuilder_ == null) {
+        changelogs_ = java.util.Collections.emptyList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+      } else {
+        changelogsBuilder_.clear();
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public Builder removeChangelogs(int index) {
+      if (changelogsBuilder_ == null) {
+        ensureChangelogsIsMutable();
+        changelogs_.remove(index);
+        onChanged();
+      } else {
+        changelogsBuilder_.remove(index);
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public com.google.cloud.dialogflow.cx.v3.Changelog.Builder getChangelogsBuilder(int index) {
+      return getChangelogsFieldBuilder().getBuilder(index);
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public com.google.cloud.dialogflow.cx.v3.ChangelogOrBuilder getChangelogsOrBuilder(int index) {
+      if (changelogsBuilder_ == null) {
+        return changelogs_.get(index);
+      } else {
+        return changelogsBuilder_.getMessageOrBuilder(index);
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public java.util.List<? extends com.google.cloud.dialogflow.cx.v3.ChangelogOrBuilder>
+        getChangelogsOrBuilderList() {
+      if (changelogsBuilder_ != null) {
+        return changelogsBuilder_.getMessageOrBuilderList();
+      } else {
+        return java.util.Collections.unmodifiableList(changelogs_);
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public com.google.cloud.dialogflow.cx.v3.Changelog.Builder addChangelogsBuilder() {
+      return getChangelogsFieldBuilder()
+          .addBuilder(com.google.cloud.dialogflow.cx.v3.Changelog.getDefaultInstance());
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public com.google.cloud.dialogflow.cx.v3.Changelog.Builder addChangelogsBuilder(int index) {
+      return getChangelogsFieldBuilder()
+          .addBuilder(index, com.google.cloud.dialogflow.cx.v3.Changelog.getDefaultInstance());
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+     */
+    public java.util.List<com.google.cloud.dialogflow.cx.v3.Changelog.Builder>
+        getChangelogsBuilderList() {
+      return getChangelogsFieldBuilder().getBuilderList();
+    }
+
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+            com.google.cloud.dialogflow.cx.v3.Changelog,
+            com.google.cloud.dialogflow.cx.v3.Changelog.Builder,
+            com.google.cloud.dialogflow.cx.v3.ChangelogOrBuilder>
+        getChangelogsFieldBuilder() {
+      if (changelogsBuilder_ == null) {
+        changelogsBuilder_ =
+            new com.google.protobuf.RepeatedFieldBuilderV3<
+                com.google.cloud.dialogflow.cx.v3.Changelog,
+                com.google.cloud.dialogflow.cx.v3.Changelog.Builder,
+                com.google.cloud.dialogflow.cx.v3.ChangelogOrBuilder>(
+                changelogs_, ((bitField0_ & 0x00000001) != 0), getParentForChildren(), isClean());
+        changelogs_ = null;
+      }
+      return changelogsBuilder_;
+    }
+
+    private java.lang.Object nextPageToken_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * Token to retrieve the next page of results, or empty if there are no more
+     * results in the list.
+     * </pre>
+     *
+     * <code>string next_page_token = 2;</code>
+     *
+     * @return The nextPageToken.
+     */
+    public java.lang.String getNextPageToken() {
+      java.lang.Object ref = nextPageToken_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        nextPageToken_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Token to retrieve the next page of results, or empty if there are no more
+     * results in the list.
+     * </pre>
+     *
+     * <code>string next_page_token = 2;</code>
+     *
+     * @return The bytes for nextPageToken.
+     */
+    public com.google.protobuf.ByteString getNextPageTokenBytes() {
+      java.lang.Object ref = nextPageToken_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        nextPageToken_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Token to retrieve the next page of results, or empty if there are no more
+     * results in the list.
+     * </pre>
+     *
+     * <code>string next_page_token = 2;</code>
+     *
+     * @param value The nextPageToken to set.
+     * @return This builder for chaining.
+     */
+    public Builder setNextPageToken(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      nextPageToken_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Token to retrieve the next page of results, or empty if there are no more
+     * results in the list.
+     * </pre>
+     *
+     * <code>string next_page_token = 2;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearNextPageToken() {
+
+      nextPageToken_ = getDefaultInstance().getNextPageToken();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Token to retrieve the next page of results, or empty if there are no more
+     * results in the list.
+     * </pre>
+     *
+     * <code>string next_page_token = 2;</code>
+     *
+     * @param value The bytes for nextPageToken to set.
+     * @return This builder for chaining.
+     */
+    public Builder setNextPageTokenBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      nextPageToken_ = value;
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+    // @@protoc_insertion_point(builder_scope:google.cloud.dialogflow.cx.v3.ListChangelogsResponse)
+  }
+
+  // @@protoc_insertion_point(class_scope:google.cloud.dialogflow.cx.v3.ListChangelogsResponse)
+  private static final com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse DEFAULT_INSTANCE;
+
+  static {
+    DEFAULT_INSTANCE = new com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse();
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser<ListChangelogsResponse> PARSER =
+      new com.google.protobuf.AbstractParser<ListChangelogsResponse>() {
+        @java.lang.Override
+        public ListChangelogsResponse parsePartialFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws com.google.protobuf.InvalidProtocolBufferException {
+          return new ListChangelogsResponse(input, extensionRegistry);
+        }
+      };
+
+  public static com.google.protobuf.Parser<ListChangelogsResponse> parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser<ListChangelogsResponse> getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3.ListChangelogsResponse getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsResponseOrBuilder.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsResponseOrBuilder.java
new file mode 100644
index 000000000..d4ea06a6e
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListChangelogsResponseOrBuilder.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3;
+
+public interface ListChangelogsResponseOrBuilder
+    extends
+    // @@protoc_insertion_point(interface_extends:google.cloud.dialogflow.cx.v3.ListChangelogsResponse)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+   */
+  java.util.List<com.google.cloud.dialogflow.cx.v3.Changelog> getChangelogsList();
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+   */
+  com.google.cloud.dialogflow.cx.v3.Changelog getChangelogs(int index);
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+   */
+  int getChangelogsCount();
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+   */
+  java.util.List<? extends com.google.cloud.dialogflow.cx.v3.ChangelogOrBuilder>
+      getChangelogsOrBuilderList();
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3.Changelog changelogs = 1;</code>
+   */
+  com.google.cloud.dialogflow.cx.v3.ChangelogOrBuilder getChangelogsOrBuilder(int index);
+
+  /**
+   *
+   *
+   * <pre>
+   * Token to retrieve the next page of results, or empty if there are no more
+   * results in the list.
+   * </pre>
+   *
+   * <code>string next_page_token = 2;</code>
+   *
+   * @return The nextPageToken.
+   */
+  java.lang.String getNextPageToken();
+  /**
+   *
+   *
+   * <pre>
+   * Token to retrieve the next page of results, or empty if there are no more
+   * results in the list.
+   * </pre>
+   *
+   * <code>string next_page_token = 2;</code>
+   *
+   * @return The bytes for nextPageToken.
+   */
+  com.google.protobuf.ByteString getNextPageTokenBytes();
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListContinuousTestResultsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListContinuousTestResultsRequest.java
index 2eddaa28f..fef08716e 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListContinuousTestResultsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListContinuousTestResultsRequest.java
@@ -264,13 +264,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -282,13 +282,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListContinuousTestResultsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListContinuousTestResultsResponse.java
index 7e1d06d96..4c64bed9e 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListContinuousTestResultsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListContinuousTestResultsResponse.java
@@ -277,7 +277,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < continuousTestResults_.size(); i++) {
       output.writeMessage(1, continuousTestResults_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -294,7 +294,7 @@ public int getSerializedSize() {
           com.google.protobuf.CodedOutputStream.computeMessageSize(
               1, continuousTestResults_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListDeploymentsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListDeploymentsRequest.java
index 37b112dd0..f0670c8a9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListDeploymentsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListDeploymentsRequest.java
@@ -263,13 +263,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -281,13 +281,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListDeploymentsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListDeploymentsResponse.java
index b8379b24d..c415c7063 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListDeploymentsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListDeploymentsResponse.java
@@ -280,7 +280,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < deployments_.size(); i++) {
       output.writeMessage(1, deployments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -295,7 +295,7 @@ public int getSerializedSize() {
     for (int i = 0; i < deployments_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, deployments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEntityTypesRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEntityTypesRequest.java
index 6a6124ec1..6afa84f4d 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEntityTypesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEntityTypesRequest.java
@@ -336,16 +336,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -357,16 +357,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEntityTypesResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEntityTypesResponse.java
index b1fa24b9a..54ebd1f88 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEntityTypesResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEntityTypesResponse.java
@@ -270,7 +270,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < entityTypes_.size(); i++) {
       output.writeMessage(1, entityTypes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -285,7 +285,7 @@ public int getSerializedSize() {
     for (int i = 0; i < entityTypes_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, entityTypes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEnvironmentsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEnvironmentsRequest.java
index a24922b75..cc8a5d9ce 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEnvironmentsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEnvironmentsRequest.java
@@ -261,13 +261,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -279,13 +279,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEnvironmentsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEnvironmentsResponse.java
index 9db771de4..9a25fe39e 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEnvironmentsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListEnvironmentsResponse.java
@@ -281,7 +281,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < environments_.size(); i++) {
       output.writeMessage(1, environments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -296,7 +296,7 @@ public int getSerializedSize() {
     for (int i = 0; i < environments_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, environments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListExperimentsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListExperimentsRequest.java
index ab70e7930..2fe2d4233 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListExperimentsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListExperimentsRequest.java
@@ -263,13 +263,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -281,13 +281,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListExperimentsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListExperimentsResponse.java
index a9458ea36..5b70ee929 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListExperimentsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListExperimentsResponse.java
@@ -280,7 +280,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < experiments_.size(); i++) {
       output.writeMessage(1, experiments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -295,7 +295,7 @@ public int getSerializedSize() {
     for (int i = 0; i < experiments_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, experiments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListFlowsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListFlowsRequest.java
index 17915833e..5fec373f9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListFlowsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListFlowsRequest.java
@@ -338,16 +338,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -359,16 +359,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListFlowsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListFlowsResponse.java
index e43aea817..e5ee473c7 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListFlowsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListFlowsResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < flows_.size(); i++) {
       output.writeMessage(1, flows_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < flows_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, flows_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListIntentsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListIntentsRequest.java
index 8dec15353..033c779f4 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListIntentsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListIntentsRequest.java
@@ -376,16 +376,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, pageToken_);
     }
     if (intentView_
@@ -401,16 +401,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, pageToken_);
     }
     if (intentView_
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListIntentsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListIntentsResponse.java
index 9aca072a9..e685af2bd 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListIntentsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListIntentsResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < intents_.size(); i++) {
       output.writeMessage(1, intents_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < intents_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, intents_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListPagesRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListPagesRequest.java
index 423d1c1d7..f297edaa4 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListPagesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListPagesRequest.java
@@ -356,16 +356,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -377,16 +377,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListPagesResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListPagesResponse.java
index 04ec4afb2..e9b237795 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListPagesResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListPagesResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < pages_.size(); i++) {
       output.writeMessage(1, pages_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < pages_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, pages_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSecuritySettingsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSecuritySettingsRequest.java
index f75d12a16..f3247927e 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSecuritySettingsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSecuritySettingsRequest.java
@@ -261,13 +261,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -279,13 +279,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSecuritySettingsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSecuritySettingsResponse.java
index 60f1bd116..a2b33dfc9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSecuritySettingsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSecuritySettingsResponse.java
@@ -268,7 +268,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < securitySettings_.size(); i++) {
       output.writeMessage(1, securitySettings_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -283,7 +283,7 @@ public int getSerializedSize() {
     for (int i = 0; i < securitySettings_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, securitySettings_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSessionEntityTypesRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSessionEntityTypesRequest.java
index fbe269994..9efbbaaf3 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSessionEntityTypesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSessionEntityTypesRequest.java
@@ -269,13 +269,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -287,13 +287,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSessionEntityTypesResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSessionEntityTypesResponse.java
index 4df500265..4d6020aa9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSessionEntityTypesResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListSessionEntityTypesResponse.java
@@ -279,7 +279,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < sessionEntityTypes_.size(); i++) {
       output.writeMessage(1, sessionEntityTypes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -295,7 +295,7 @@ public int getSerializedSize() {
       size +=
           com.google.protobuf.CodedOutputStream.computeMessageSize(1, sessionEntityTypes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCaseResultsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCaseResultsRequest.java
index 84ae32915..92fa539b0 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCaseResultsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCaseResultsRequest.java
@@ -358,16 +358,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, filter_);
     }
     unknownFields.writeTo(output);
@@ -379,16 +379,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, filter_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCaseResultsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCaseResultsResponse.java
index f71b0f77e..eec429edb 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCaseResultsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCaseResultsResponse.java
@@ -267,7 +267,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < testCaseResults_.size(); i++) {
       output.writeMessage(1, testCaseResults_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -282,7 +282,7 @@ public int getSerializedSize() {
     for (int i = 0; i < testCaseResults_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, testCaseResults_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCasesRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCasesRequest.java
index 0a189516b..09121b035 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCasesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCasesRequest.java
@@ -471,13 +471,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     if (view_
@@ -495,13 +495,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     if (view_
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCasesResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCasesResponse.java
index 05419f453..cb237b2a0 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCasesResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTestCasesResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < testCases_.size(); i++) {
       output.writeMessage(1, testCases_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < testCases_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, testCases_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTransitionRouteGroupsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTransitionRouteGroupsRequest.java
index f9a2add7c..0cbe030b1 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTransitionRouteGroupsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTransitionRouteGroupsRequest.java
@@ -339,16 +339,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -360,16 +360,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTransitionRouteGroupsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTransitionRouteGroupsResponse.java
index 674a4f3de..56a7ded4f 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTransitionRouteGroupsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListTransitionRouteGroupsResponse.java
@@ -292,7 +292,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < transitionRouteGroups_.size(); i++) {
       output.writeMessage(1, transitionRouteGroups_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -309,7 +309,7 @@ public int getSerializedSize() {
           com.google.protobuf.CodedOutputStream.computeMessageSize(
               1, transitionRouteGroups_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListVersionsRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListVersionsRequest.java
index 2838f831e..91e167da0 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListVersionsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListVersionsRequest.java
@@ -263,13 +263,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -281,13 +281,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListVersionsResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListVersionsResponse.java
index 0097b471d..7473a28f0 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListVersionsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListVersionsResponse.java
@@ -274,7 +274,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < versions_.size(); i++) {
       output.writeMessage(1, versions_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -289,7 +289,7 @@ public int getSerializedSize() {
     for (int i = 0; i < versions_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, versions_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListWebhooksRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListWebhooksRequest.java
index f0e0883bf..5a652f5b2 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListWebhooksRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListWebhooksRequest.java
@@ -261,13 +261,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -279,13 +279,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListWebhooksResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListWebhooksResponse.java
index 6c2649c62..93e0ca144 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListWebhooksResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ListWebhooksResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < webhooks_.size(); i++) {
       output.writeMessage(1, webhooks_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < webhooks_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, webhooks_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LoadVersionRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LoadVersionRequest.java
index 26957072a..dbcd05881 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LoadVersionRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LoadVersionRequest.java
@@ -208,7 +208,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (allowOverrideAgentResources_ != false) {
@@ -223,7 +223,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (allowOverrideAgentResources_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LookupEnvironmentHistoryRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LookupEnvironmentHistoryRequest.java
index 169cb0042..03b4705d6 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LookupEnvironmentHistoryRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LookupEnvironmentHistoryRequest.java
@@ -264,13 +264,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -282,13 +282,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LookupEnvironmentHistoryResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LookupEnvironmentHistoryResponse.java
index baadb5b7b..67a0d0b46 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LookupEnvironmentHistoryResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/LookupEnvironmentHistoryResponse.java
@@ -272,7 +272,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < environments_.size(); i++) {
       output.writeMessage(1, environments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -287,7 +287,7 @@ public int getSerializedSize() {
     for (int i = 0; i < environments_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, environments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Match.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Match.java
index cede0d489..41430e1e3 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Match.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Match.java
@@ -730,7 +730,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (parameters_ != null) {
       output.writeMessage(2, getParameters());
     }
-    if (!getResolvedInputBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(resolvedInput_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, resolvedInput_);
     }
     if (matchType_
@@ -740,7 +740,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (confidence_ != 0F) {
       output.writeFloat(5, confidence_);
     }
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, event_);
     }
     unknownFields.writeTo(output);
@@ -758,7 +758,7 @@ public int getSerializedSize() {
     if (parameters_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getParameters());
     }
-    if (!getResolvedInputBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(resolvedInput_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, resolvedInput_);
     }
     if (matchType_
@@ -768,7 +768,7 @@ public int getSerializedSize() {
     if (confidence_ != 0F) {
       size += com.google.protobuf.CodedOutputStream.computeFloatSize(5, confidence_);
     }
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, event_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/MatchIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/MatchIntentRequest.java
index a7d018ba8..bc2e23f36 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/MatchIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/MatchIntentRequest.java
@@ -333,7 +333,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, session_);
     }
     if (queryParams_ != null) {
@@ -351,7 +351,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, session_);
     }
     if (queryParams_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Page.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Page.java
index 3f2541657..ac91fe1c4 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Page.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Page.java
@@ -751,10 +751,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     if (form_ != null) {
@@ -782,10 +782,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     if (form_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/PageInfo.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/PageInfo.java
index 390c5bc8b..45a52f9a9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/PageInfo.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/PageInfo.java
@@ -988,7 +988,7 @@ public final boolean isInitialized() {
 
       @java.lang.Override
       public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-        if (!getDisplayNameBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 1, displayName_);
         }
         if (required_ != false) {
@@ -1015,7 +1015,7 @@ public int getSerializedSize() {
         if (size != -1) return size;
 
         size = 0;
-        if (!getDisplayNameBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, displayName_);
         }
         if (required_ != false) {
@@ -3086,7 +3086,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getCurrentPageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(currentPage_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, currentPage_);
     }
     if (formInfo_ != null) {
@@ -3101,7 +3101,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getCurrentPageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(currentPage_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, currentPage_);
     }
     if (formInfo_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryInput.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryInput.java
index e37027b53..6e43d8440 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryInput.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryInput.java
@@ -581,7 +581,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (inputCase_ == 3) {
       output.writeMessage(3, (com.google.cloud.dialogflow.cx.v3.IntentInput) input_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, languageCode_);
     }
     if (inputCase_ == 5) {
@@ -612,7 +612,7 @@ public int getSerializedSize() {
           com.google.protobuf.CodedOutputStream.computeMessageSize(
               3, (com.google.cloud.dialogflow.cx.v3.IntentInput) input_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, languageCode_);
     }
     if (inputCase_ == 5) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryParameters.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryParameters.java
index b627f50eb..858ef28cf 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryParameters.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryParameters.java
@@ -935,7 +935,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getTimeZoneBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(timeZone_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, timeZone_);
     }
     if (geoLocation_ != null) {
@@ -950,7 +950,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (parameters_ != null) {
       output.writeMessage(5, getParameters());
     }
-    if (!getCurrentPageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(currentPage_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, currentPage_);
     }
     if (disableWebhook_ != false) {
@@ -973,7 +973,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getTimeZoneBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(timeZone_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, timeZone_);
     }
     if (geoLocation_ != null) {
@@ -989,7 +989,7 @@ public int getSerializedSize() {
     if (parameters_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(5, getParameters());
     }
-    if (!getCurrentPageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(currentPage_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, currentPage_);
     }
     if (disableWebhook_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryResult.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryResult.java
index 90b6e1467..98c58819a 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/QueryResult.java
@@ -1389,7 +1389,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (queryCase_ == 1) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, query_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (parameters_ != null) {
@@ -1446,7 +1446,7 @@ public int getSerializedSize() {
     if (queryCase_ == 1) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, query_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (parameters_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ResourceName.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ResourceName.java
index 5e5edf0fa..3501c93dc 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ResourceName.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ResourceName.java
@@ -231,10 +231,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     unknownFields.writeTo(output);
@@ -246,10 +246,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ResponseMessage.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ResponseMessage.java
index eca584e0a..877824dc9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ResponseMessage.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ResponseMessage.java
@@ -4668,7 +4668,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getAudioUriBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(audioUri_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, audioUri_);
       }
       if (allowPlaybackInterruption_ != false) {
@@ -4683,7 +4683,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getAudioUriBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(audioUri_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, audioUri_);
       }
       if (allowPlaybackInterruption_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RestoreAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RestoreAgentRequest.java
index 53d9ef0b2..7c85d1cd9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RestoreAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RestoreAgentRequest.java
@@ -564,7 +564,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (agentCase_ == 2) {
@@ -588,7 +588,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (agentCase_ == 2) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RolloutConfig.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RolloutConfig.java
index a7e14a230..717991e0c 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RolloutConfig.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RolloutConfig.java
@@ -472,7 +472,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, displayName_);
       }
       if (trafficPercent_ != 0) {
@@ -490,7 +490,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, displayName_);
       }
       if (trafficPercent_ != 0) {
@@ -1455,10 +1455,10 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < rolloutSteps_.size(); i++) {
       output.writeMessage(1, rolloutSteps_.get(i));
     }
-    if (!getRolloutConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(rolloutCondition_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, rolloutCondition_);
     }
-    if (!getFailureConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(failureCondition_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, failureCondition_);
     }
     unknownFields.writeTo(output);
@@ -1473,10 +1473,10 @@ public int getSerializedSize() {
     for (int i = 0; i < rolloutSteps_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, rolloutSteps_.get(i));
     }
-    if (!getRolloutConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(rolloutCondition_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, rolloutCondition_);
     }
-    if (!getFailureConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(failureCondition_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, failureCondition_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RolloutState.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RolloutState.java
index 9138b5b50..c0199009c 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RolloutState.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RolloutState.java
@@ -258,7 +258,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getStepBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(step_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, step_);
     }
     if (startTime_ != null) {
@@ -276,7 +276,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getStepBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(step_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, step_);
     }
     if (startTime_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RunContinuousTestRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RunContinuousTestRequest.java
index 21f599852..8f45f14ae 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RunContinuousTestRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RunContinuousTestRequest.java
@@ -180,7 +180,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, environment_);
     }
     unknownFields.writeTo(output);
@@ -192,7 +192,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, environment_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RunTestCaseRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RunTestCaseRequest.java
index d71b05be3..6d4a253e4 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RunTestCaseRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/RunTestCaseRequest.java
@@ -245,10 +245,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, environment_);
     }
     unknownFields.writeTo(output);
@@ -260,10 +260,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, environment_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SecuritySettings.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SecuritySettings.java
index e0407f2a8..b4be0ee5d 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SecuritySettings.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SecuritySettings.java
@@ -1825,10 +1825,10 @@ public final boolean isInitialized() {
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
     getSerializedSize();
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     if (redactionStrategy_
@@ -1853,13 +1853,13 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < purgeDataTypes_.size(); i++) {
       output.writeEnumNoTag(purgeDataTypes_.get(i));
     }
-    if (!getInspectTemplateBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(inspectTemplate_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 9, inspectTemplate_);
     }
     if (insightsExportSettings_ != null) {
       output.writeMessage(13, getInsightsExportSettings());
     }
-    if (!getDeidentifyTemplateBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(deidentifyTemplate_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 17, deidentifyTemplate_);
     }
     unknownFields.writeTo(output);
@@ -1871,10 +1871,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     if (redactionStrategy_
@@ -1907,14 +1907,14 @@ public int getSerializedSize() {
       }
       purgeDataTypesMemoizedSerializedSize = dataSize;
     }
-    if (!getInspectTemplateBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(inspectTemplate_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(9, inspectTemplate_);
     }
     if (insightsExportSettings_ != null) {
       size +=
           com.google.protobuf.CodedOutputStream.computeMessageSize(13, getInsightsExportSettings());
     }
-    if (!getDeidentifyTemplateBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(deidentifyTemplate_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(17, deidentifyTemplate_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SessionEntityType.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SessionEntityType.java
index 1d71304aa..3e4c96307 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SessionEntityType.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SessionEntityType.java
@@ -530,7 +530,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (entityOverrideMode_
@@ -551,7 +551,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (entityOverrideMode_
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SessionInfo.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SessionInfo.java
index 642c0286e..4ade7a526 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SessionInfo.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SessionInfo.java
@@ -338,7 +338,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, session_);
     }
     com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
@@ -352,7 +352,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, session_);
     }
     for (java.util.Map.Entry<java.lang.String, com.google.protobuf.Value> entry :
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SpeechWordInfo.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SpeechWordInfo.java
index 678436eed..8ac4c941a 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SpeechWordInfo.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/SpeechWordInfo.java
@@ -342,7 +342,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (endOffset_ != null) {
       output.writeMessage(2, getEndOffset());
     }
-    if (!getWordBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(word_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, word_);
     }
     if (confidence_ != 0F) {
@@ -363,7 +363,7 @@ public int getSerializedSize() {
     if (endOffset_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getEndOffset());
     }
-    if (!getWordBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(word_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, word_);
     }
     if (confidence_ != 0F) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StartExperimentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StartExperimentRequest.java
index 9239e124f..b03a8ed0e 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StartExperimentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StartExperimentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StopExperimentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StopExperimentRequest.java
index bca0d3e01..f8522cf00 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StopExperimentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StopExperimentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingDetectIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingDetectIntentRequest.java
index 13decc3cc..1d410b49f 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingDetectIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingDetectIntentRequest.java
@@ -26,7 +26,7 @@
  * [Sessions.StreamingDetectIntent][google.cloud.dialogflow.cx.v3.Sessions.StreamingDetectIntent] method.
  * Multiple request messages should be sent in order:
  * 1.  The first message must contain
- * [session][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.session],
+ *     [session][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.session],
  *     [query_input][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.query_input] plus optionally
  *     [query_params][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.query_params]. If the client
  *     wants to receive an audio response, it should also contain
@@ -450,7 +450,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, session_);
     }
     if (queryParams_ != null) {
@@ -474,7 +474,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, session_);
     }
     if (queryParams_ != null) {
@@ -655,7 +655,7 @@ protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.Build
    * [Sessions.StreamingDetectIntent][google.cloud.dialogflow.cx.v3.Sessions.StreamingDetectIntent] method.
    * Multiple request messages should be sent in order:
    * 1.  The first message must contain
-   * [session][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.session],
+   *     [session][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.session],
    *     [query_input][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.query_input] plus optionally
    *     [query_params][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.query_params]. If the client
    *     wants to receive an audio response, it should also contain
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingDetectIntentResponse.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingDetectIntentResponse.java
index 7de422f30..920a60502 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingDetectIntentResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingDetectIntentResponse.java
@@ -22,18 +22,24 @@
  *
  *
  * <pre>
- * The top-level message returned from the `StreamingDetectIntent` method.
- * Multiple response messages can be returned in order:
- * 1.  If the input was set to streaming audio, the first one or more messages
- *     contain `recognition_result`. Each `recognition_result` represents a more
- *     complete transcript of what the user said. The last `recognition_result`
- *     has `is_final` set to `true`.
- * 2.  If `enable_partial_response` is true, the following N messages
- *     (currently 1 &lt;= N &lt;= 4) contain `detect_intent_response`. The first (N-1)
- *     `detect_intent_response`s will have `response_type` set to `PARTIAL`.
- *     The last `detect_intent_response` has `response_type` set to `FINAL`.
- *     If `response_type` is false, response stream only contains
- *     the final `detect_intent_response`.
+ * The top-level message returned from the
+ * [StreamingDetectIntent][google.cloud.dialogflow.cx.v3.Sessions.StreamingDetectIntent] method.
+ * Multiple response messages (N) can be returned in order.
+ * The first (N-1) responses set either the `recognition_result` or
+ * `detect_intent_response` field, depending on the request:
+ * *   If the `StreamingDetectIntentRequest.query_input.audio` field was
+ *     set, and the `StreamingDetectIntentRequest.enable_partial_response`
+ *     field was false, the `recognition_result` field is populated for each
+ *     of the (N-1) responses.
+ *     See the [StreamingRecognitionResult][google.cloud.dialogflow.cx.v3.StreamingRecognitionResult] message for details
+ *     about the result message sequence.
+ * *   If the `StreamingDetectIntentRequest.enable_partial_response` field was
+ *     true, the `detect_intent_response` field is populated for each
+ *     of the (N-1) responses, where 1 &lt;= N &lt;= 4.
+ *     These responses set the [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3.DetectIntentResponse.response_type] field
+ *     to `PARTIAL`.
+ * For the final Nth response message, the `detect_intent_response` is fully
+ * populated, and [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3.DetectIntentResponse.response_type] is set to `FINAL`.
  * </pre>
  *
  * Protobuf type {@code google.cloud.dialogflow.cx.v3.StreamingDetectIntentResponse}
@@ -500,18 +506,24 @@ protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.Build
    *
    *
    * <pre>
-   * The top-level message returned from the `StreamingDetectIntent` method.
-   * Multiple response messages can be returned in order:
-   * 1.  If the input was set to streaming audio, the first one or more messages
-   *     contain `recognition_result`. Each `recognition_result` represents a more
-   *     complete transcript of what the user said. The last `recognition_result`
-   *     has `is_final` set to `true`.
-   * 2.  If `enable_partial_response` is true, the following N messages
-   *     (currently 1 &lt;= N &lt;= 4) contain `detect_intent_response`. The first (N-1)
-   *     `detect_intent_response`s will have `response_type` set to `PARTIAL`.
-   *     The last `detect_intent_response` has `response_type` set to `FINAL`.
-   *     If `response_type` is false, response stream only contains
-   *     the final `detect_intent_response`.
+   * The top-level message returned from the
+   * [StreamingDetectIntent][google.cloud.dialogflow.cx.v3.Sessions.StreamingDetectIntent] method.
+   * Multiple response messages (N) can be returned in order.
+   * The first (N-1) responses set either the `recognition_result` or
+   * `detect_intent_response` field, depending on the request:
+   * *   If the `StreamingDetectIntentRequest.query_input.audio` field was
+   *     set, and the `StreamingDetectIntentRequest.enable_partial_response`
+   *     field was false, the `recognition_result` field is populated for each
+   *     of the (N-1) responses.
+   *     See the [StreamingRecognitionResult][google.cloud.dialogflow.cx.v3.StreamingRecognitionResult] message for details
+   *     about the result message sequence.
+   * *   If the `StreamingDetectIntentRequest.enable_partial_response` field was
+   *     true, the `detect_intent_response` field is populated for each
+   *     of the (N-1) responses, where 1 &lt;= N &lt;= 4.
+   *     These responses set the [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3.DetectIntentResponse.response_type] field
+   *     to `PARTIAL`.
+   * For the final Nth response message, the `detect_intent_response` is fully
+   * populated, and [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3.DetectIntentResponse.response_type] is set to `FINAL`.
    * </pre>
    *
    * Protobuf type {@code google.cloud.dialogflow.cx.v3.StreamingDetectIntentResponse}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingRecognitionResult.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingRecognitionResult.java
index ce8e85541..a4fbaf0c7 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingRecognitionResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/StreamingRecognitionResult.java
@@ -25,23 +25,34 @@
  * Contains a speech recognition result corresponding to a portion of the audio
  * that is currently being processed or an indication that this is the end
  * of the single requested utterance.
- * Example:
- * 1.  transcript: "tube"
- * 2.  transcript: "to be a"
- * 3.  transcript: "to be"
- * 4.  transcript: "to be or not to be"
- *     is_final: true
- * 5.  transcript: " that's"
- * 6.  transcript: " that is"
- * 7.  message_type: `END_OF_SINGLE_UTTERANCE`
- * 8.  transcript: " that is the question"
- *     is_final: true
- * Only two of the responses contain final results (#4 and #8 indicated by
- * `is_final: true`). Concatenating these generates the full transcript: "to be
- * or not to be that is the question".
- * In each response we populate:
- * *  for `TRANSCRIPT`: `transcript` and possibly `is_final`.
- * *  for `END_OF_SINGLE_UTTERANCE`: only `message_type`.
+ * While end-user audio is being processed, Dialogflow sends a series of
+ * results. Each result may contain a `transcript` value. A transcript
+ * represents a portion of the utterance. While the recognizer is processing
+ * audio, transcript values may be interim values or finalized values.
+ * Once a transcript is finalized, the `is_final` value is set to true and
+ * processing continues for the next transcript.
+ * If `StreamingDetectIntentRequest.query_input.audio.config.single_utterance`
+ * was true, and the recognizer has completed processing audio,
+ * the `message_type` value is set to `END_OF_SINGLE_UTTERANCE and the
+ * following (last) result contains the last finalized transcript.
+ * The complete end-user utterance is determined by concatenating the
+ * finalized transcript values received for the series of results.
+ * In the following example, single utterance is enabled. In the case where
+ * single utterance is not enabled, result 7 would not occur.
+ * ```
+ * Num | transcript              | message_type            | is_final
+ * --- | ----------------------- | ----------------------- | --------
+ * 1   | "tube"                  | TRANSCRIPT              | false
+ * 2   | "to be a"               | TRANSCRIPT              | false
+ * 3   | "to be"                 | TRANSCRIPT              | false
+ * 4   | "to be or not to be"    | TRANSCRIPT              | true
+ * 5   | "that's"                | TRANSCRIPT              | false
+ * 6   | "that is                | TRANSCRIPT              | false
+ * 7   | unset                   | END_OF_SINGLE_UTTERANCE | unset
+ * 8   | " that is the question" | TRANSCRIPT              | true
+ * ```
+ * Concatenating the finalized transcripts with `is_final` set to true,
+ * the complete utterance becomes "to be or not to be that is the question".
  * </pre>
  *
  * Protobuf type {@code google.cloud.dialogflow.cx.v3.StreamingRecognitionResult}
@@ -730,7 +741,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(1, messageType_);
     }
-    if (!getTranscriptBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(transcript_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, transcript_);
     }
     if (isFinal_ != false) {
@@ -748,7 +759,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (speechEndOffset_ != null) {
       output.writeMessage(8, getSpeechEndOffset());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 10, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -766,7 +777,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(1, messageType_);
     }
-    if (!getTranscriptBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(transcript_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, transcript_);
     }
     if (isFinal_ != false) {
@@ -784,7 +795,7 @@ public int getSerializedSize() {
     if (speechEndOffset_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(8, getSpeechEndOffset());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(10, languageCode_);
     }
     size += unknownFields.getSerializedSize();
@@ -955,23 +966,34 @@ protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.Build
    * Contains a speech recognition result corresponding to a portion of the audio
    * that is currently being processed or an indication that this is the end
    * of the single requested utterance.
-   * Example:
-   * 1.  transcript: "tube"
-   * 2.  transcript: "to be a"
-   * 3.  transcript: "to be"
-   * 4.  transcript: "to be or not to be"
-   *     is_final: true
-   * 5.  transcript: " that's"
-   * 6.  transcript: " that is"
-   * 7.  message_type: `END_OF_SINGLE_UTTERANCE`
-   * 8.  transcript: " that is the question"
-   *     is_final: true
-   * Only two of the responses contain final results (#4 and #8 indicated by
-   * `is_final: true`). Concatenating these generates the full transcript: "to be
-   * or not to be that is the question".
-   * In each response we populate:
-   * *  for `TRANSCRIPT`: `transcript` and possibly `is_final`.
-   * *  for `END_OF_SINGLE_UTTERANCE`: only `message_type`.
+   * While end-user audio is being processed, Dialogflow sends a series of
+   * results. Each result may contain a `transcript` value. A transcript
+   * represents a portion of the utterance. While the recognizer is processing
+   * audio, transcript values may be interim values or finalized values.
+   * Once a transcript is finalized, the `is_final` value is set to true and
+   * processing continues for the next transcript.
+   * If `StreamingDetectIntentRequest.query_input.audio.config.single_utterance`
+   * was true, and the recognizer has completed processing audio,
+   * the `message_type` value is set to `END_OF_SINGLE_UTTERANCE and the
+   * following (last) result contains the last finalized transcript.
+   * The complete end-user utterance is determined by concatenating the
+   * finalized transcript values received for the series of results.
+   * In the following example, single utterance is enabled. In the case where
+   * single utterance is not enabled, result 7 would not occur.
+   * ```
+   * Num | transcript              | message_type            | is_final
+   * --- | ----------------------- | ----------------------- | --------
+   * 1   | "tube"                  | TRANSCRIPT              | false
+   * 2   | "to be a"               | TRANSCRIPT              | false
+   * 3   | "to be"                 | TRANSCRIPT              | false
+   * 4   | "to be or not to be"    | TRANSCRIPT              | true
+   * 5   | "that's"                | TRANSCRIPT              | false
+   * 6   | "that is                | TRANSCRIPT              | false
+   * 7   | unset                   | END_OF_SINGLE_UTTERANCE | unset
+   * 8   | " that is the question" | TRANSCRIPT              | true
+   * ```
+   * Concatenating the finalized transcripts with `is_final` set to true,
+   * the complete utterance becomes "to be or not to be that is the question".
    * </pre>
    *
    * Protobuf type {@code google.cloud.dialogflow.cx.v3.StreamingRecognitionResult}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestCase.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestCase.java
index 4fac6bfc6..cc355fe07 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestCase.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestCase.java
@@ -688,16 +688,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     for (int i = 0; i < tags_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, tags_.getRaw(i));
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, displayName_);
     }
-    if (!getNotesBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(notes_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, notes_);
     }
     for (int i = 0; i < testCaseConversationTurns_.size(); i++) {
@@ -721,7 +721,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     {
@@ -732,10 +732,10 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getTagsList().size();
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, displayName_);
     }
-    if (!getNotesBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(notes_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, notes_);
     }
     for (int i = 0; i < testCaseConversationTurns_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestCaseResult.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestCaseResult.java
index ac4cc3476..2ef9537a5 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestCaseResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestCaseResult.java
@@ -436,10 +436,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, environment_);
     }
     for (int i = 0; i < conversationTurns_.size(); i++) {
@@ -461,10 +461,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, environment_);
     }
     for (int i = 0; i < conversationTurns_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestConfig.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestConfig.java
index 2473ace9d..a7e421bed 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestConfig.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestConfig.java
@@ -257,7 +257,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < trackingParameters_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, trackingParameters_.getRaw(i));
     }
-    if (!getFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flow_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, flow_);
     }
     unknownFields.writeTo(output);
@@ -277,7 +277,7 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getTrackingParametersList().size();
     }
-    if (!getFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flow_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, flow_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestError.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestError.java
index dda279013..e8cadd05b 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestError.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestError.java
@@ -295,7 +295,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getTestCaseBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(testCase_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, testCase_);
     }
     if (status_ != null) {
@@ -313,7 +313,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getTestCaseBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(testCase_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, testCase_);
     }
     if (status_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestRunDifference.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestRunDifference.java
index 7c937156e..92fb422f0 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestRunDifference.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TestRunDifference.java
@@ -428,7 +428,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(1, type_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, description_);
     }
     unknownFields.writeTo(output);
@@ -445,7 +445,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(1, type_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, description_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TextInput.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TextInput.java
index 1c75ede4d..99c6ae8b9 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TextInput.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TextInput.java
@@ -176,7 +176,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getTextBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(text_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, text_);
     }
     unknownFields.writeTo(output);
@@ -188,7 +188,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getTextBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(text_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, text_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TrainFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TrainFlowRequest.java
index a19c3f82a..e1894e01b 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TrainFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TrainFlowRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TransitionRoute.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TransitionRoute.java
index 6d0f34c01..4d42eee70 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TransitionRoute.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TransitionRoute.java
@@ -606,10 +606,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getIntentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, intent_);
     }
-    if (!getConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, condition_);
     }
     if (triggerFulfillment_ != null) {
@@ -621,7 +621,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (targetCase_ == 5) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, target_);
     }
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, name_);
     }
     unknownFields.writeTo(output);
@@ -633,10 +633,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getIntentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, intent_);
     }
-    if (!getConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, condition_);
     }
     if (triggerFulfillment_ != null) {
@@ -648,7 +648,7 @@ public int getSerializedSize() {
     if (targetCase_ == 5) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, target_);
     }
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TransitionRouteGroup.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TransitionRouteGroup.java
index e84672647..d80c3f1b1 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TransitionRouteGroup.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/TransitionRouteGroup.java
@@ -331,10 +331,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     for (int i = 0; i < transitionRoutes_.size(); i++) {
@@ -349,10 +349,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     for (int i = 0; i < transitionRoutes_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateEntityTypeRequest.java
index 2f01bac5f..2c5273978 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateEntityTypeRequest.java
@@ -324,7 +324,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (entityType_ != null) {
       output.writeMessage(1, getEntityType());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (updateMask_ != null) {
@@ -342,7 +342,7 @@ public int getSerializedSize() {
     if (entityType_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, getEntityType());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (updateMask_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateFlowRequest.java
index 0b6f437b3..c529a060d 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateFlowRequest.java
@@ -327,7 +327,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (updateMask_ != null) {
       output.writeMessage(2, getUpdateMask());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -345,7 +345,7 @@ public int getSerializedSize() {
     if (updateMask_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getUpdateMask());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateIntentRequest.java
index 065bb3741..19bf7a6b8 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateIntentRequest.java
@@ -323,7 +323,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (intent_ != null) {
       output.writeMessage(1, getIntent());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (updateMask_ != null) {
@@ -341,7 +341,7 @@ public int getSerializedSize() {
     if (intent_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, getIntent());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (updateMask_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdatePageRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdatePageRequest.java
index d9b469336..88923795e 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdatePageRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdatePageRequest.java
@@ -340,7 +340,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (page_ != null) {
       output.writeMessage(1, getPage());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (updateMask_ != null) {
@@ -358,7 +358,7 @@ public int getSerializedSize() {
     if (page_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, getPage());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (updateMask_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateTransitionRouteGroupRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateTransitionRouteGroupRequest.java
index 70b2def11..856d8fa80 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateTransitionRouteGroupRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/UpdateTransitionRouteGroupRequest.java
@@ -330,7 +330,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (updateMask_ != null) {
       output.writeMessage(2, getUpdateMask());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -349,7 +349,7 @@ public int getSerializedSize() {
     if (updateMask_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getUpdateMask());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidateAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidateAgentRequest.java
index 9898950ee..c50131b1e 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidateAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidateAgentRequest.java
@@ -237,10 +237,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -252,10 +252,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidateFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidateFlowRequest.java
index f4d637ea0..379efad78 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidateFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidateFlowRequest.java
@@ -239,10 +239,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -254,10 +254,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidationMessage.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidationMessage.java
index ff6e1e159..05e558bff 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidationMessage.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/ValidationMessage.java
@@ -1028,7 +1028,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(3, severity_);
     }
-    if (!getDetailBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(detail_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, detail_);
     }
     for (int i = 0; i < resourceNames_.size(); i++) {
@@ -1062,7 +1062,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(3, severity_);
     }
-    if (!getDetailBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(detail_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, detail_);
     }
     for (int i = 0; i < resourceNames_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Version.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Version.java
index cb2577f59..671d88498 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Version.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Version.java
@@ -657,13 +657,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, description_);
     }
     if (nluSettings_ != null) {
@@ -684,13 +684,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, description_);
     }
     if (nluSettings_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/VersionVariants.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/VersionVariants.java
index 8724079e6..ba7a60607 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/VersionVariants.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/VersionVariants.java
@@ -390,7 +390,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getVersionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, version_);
       }
       if (trafficAllocation_ != 0F) {
@@ -408,7 +408,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getVersionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, version_);
       }
       if (trafficAllocation_ != 0F) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/VoiceSelectionParams.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/VoiceSelectionParams.java
index e6a230129..27db81524 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/VoiceSelectionParams.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/VoiceSelectionParams.java
@@ -236,7 +236,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (ssmlGender_
@@ -253,7 +253,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (ssmlGender_
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Webhook.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Webhook.java
index 640d77b5a..b9fc6073f 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Webhook.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/Webhook.java
@@ -735,13 +735,13 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getUriBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uri_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, uri_);
       }
-      if (!getUsernameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(username_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 2, username_);
       }
-      if (!getPasswordBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(password_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 3, password_);
       }
       com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
@@ -755,13 +755,13 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getUriBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uri_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, uri_);
       }
-      if (!getUsernameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(username_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, username_);
       }
-      if (!getPasswordBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(password_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, password_);
       }
       for (java.util.Map.Entry<java.lang.String, java.lang.String> entry :
@@ -1999,7 +1999,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getServiceBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(service_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, service_);
       }
       if (genericWebService_ != null) {
@@ -2014,7 +2014,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getServiceBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(service_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, service_);
       }
       if (genericWebService_ != null) {
@@ -3088,10 +3088,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     if (webhookCase_ == 4) {
@@ -3117,10 +3117,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     if (webhookCase_ == 4) {
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/WebhookRequest.java b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/WebhookRequest.java
index 811697319..6f1923a61 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/WebhookRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/java/com/google/cloud/dialogflow/cx/v3/WebhookRequest.java
@@ -456,7 +456,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getTagBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(tag_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, tag_);
       }
       unknownFields.writeTo(output);
@@ -468,7 +468,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getTagBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(tag_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, tag_);
       }
       size += unknownFields.getSerializedSize();
@@ -1535,7 +1535,7 @@ public final boolean isInitialized() {
 
       @java.lang.Override
       public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-        if (!getOriginalValueBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(originalValue_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 1, originalValue_);
         }
         if (resolvedValue_ != null) {
@@ -1550,7 +1550,7 @@ public int getSerializedSize() {
         if (size != -1) return size;
 
         size = 0;
-        if (!getOriginalValueBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(originalValue_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, originalValue_);
         }
         if (resolvedValue_ != null) {
@@ -2547,12 +2547,12 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getLastMatchedIntentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(lastMatchedIntent_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, lastMatchedIntent_);
       }
       com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
           output, internalGetParameters(), ParametersDefaultEntryHolder.defaultEntry, 2);
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 3, displayName_);
       }
       if (confidence_ != 0F) {
@@ -2567,7 +2567,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getLastMatchedIntentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(lastMatchedIntent_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, lastMatchedIntent_);
       }
       for (java.util.Map.Entry<
@@ -2585,7 +2585,7 @@ public int getSerializedSize() {
                     .build();
         size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, parameters__);
       }
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, displayName_);
       }
       if (confidence_ != 0F) {
@@ -5051,7 +5051,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getDetectIntentResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(detectIntentResponseId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, detectIntentResponseId_);
     }
     if (intentInfo_ != null) {
@@ -5087,7 +5087,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (queryCase_ == 14) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 14, query_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 15, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -5099,7 +5099,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getDetectIntentResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(detectIntentResponseId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, detectIntentResponseId_);
     }
     if (intentInfo_ != null) {
@@ -5136,7 +5136,7 @@ public int getSerializedSize() {
     if (queryCase_ == 14) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(14, query_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(15, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/audio_config.proto b/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/audio_config.proto
index ea5327863..49e21d92f 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/audio_config.proto
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/audio_config.proto
@@ -31,31 +31,6 @@ option java_package = "com.google.cloud.dialogflow.cx.v3";
 option objc_class_prefix = "DF";
 option ruby_package = "Google::Cloud::Dialogflow::CX::V3";
 
-// Information for a word recognized by the speech recognizer.
-message SpeechWordInfo {
-  // The word this info is for.
-  string word = 3;
-
-  // Time offset relative to the beginning of the audio that corresponds to the
-  // start of the spoken word. This is an experimental feature and the accuracy
-  // of the time offset can vary.
-  google.protobuf.Duration start_offset = 1;
-
-  // Time offset relative to the beginning of the audio that corresponds to the
-  // end of the spoken word. This is an experimental feature and the accuracy of
-  // the time offset can vary.
-  google.protobuf.Duration end_offset = 2;
-
-  // The Speech confidence between 0.0 and 1.0 for this word. A higher number
-  // indicates an estimated greater likelihood that the recognized word is
-  // correct. The default of 0.0 is a sentinel value indicating that confidence
-  // was not set.
-  //
-  // This field is not guaranteed to be fully stable over time for the same
-  // audio input. Users should also not rely on it to always be provided.
-  float confidence = 4;
-}
-
 // Audio encoding of the audio content sent in the conversational query request.
 // Refer to the
 // [Cloud Speech API
@@ -105,6 +80,31 @@ enum AudioEncoding {
   AUDIO_ENCODING_SPEEX_WITH_HEADER_BYTE = 7;
 }
 
+// Information for a word recognized by the speech recognizer.
+message SpeechWordInfo {
+  // The word this info is for.
+  string word = 3;
+
+  // Time offset relative to the beginning of the audio that corresponds to the
+  // start of the spoken word. This is an experimental feature and the accuracy
+  // of the time offset can vary.
+  google.protobuf.Duration start_offset = 1;
+
+  // Time offset relative to the beginning of the audio that corresponds to the
+  // end of the spoken word. This is an experimental feature and the accuracy of
+  // the time offset can vary.
+  google.protobuf.Duration end_offset = 2;
+
+  // The Speech confidence between 0.0 and 1.0 for this word. A higher number
+  // indicates an estimated greater likelihood that the recognized word is
+  // correct. The default of 0.0 is a sentinel value indicating that confidence
+  // was not set.
+  //
+  // This field is not guaranteed to be fully stable over time for the same
+  // audio input. Users should also not rely on it to always be provided.
+  float confidence = 4;
+}
+
 // Instructs the speech recognizer on how to process the audio content.
 message InputAudioConfig {
   // Required. Audio encoding of the audio content to process.
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/changelog.proto b/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/changelog.proto
new file mode 100644
index 000000000..997de1bb6
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/changelog.proto
@@ -0,0 +1,154 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.cloud.dialogflow.cx.v3;
+
+import "google/api/annotations.proto";
+import "google/api/client.proto";
+import "google/api/field_behavior.proto";
+import "google/api/resource.proto";
+import "google/protobuf/struct.proto";
+import "google/protobuf/timestamp.proto";
+
+option cc_enable_arenas = true;
+option csharp_namespace = "Google.Cloud.Dialogflow.Cx.V3";
+option go_package = "google.golang.org/genproto/googleapis/cloud/dialogflow/cx/v3;cx";
+option java_multiple_files = true;
+option java_outer_classname = "ChangelogProto";
+option java_package = "com.google.cloud.dialogflow.cx.v3";
+option objc_class_prefix = "DF";
+option ruby_package = "Google::Cloud::Dialogflow::CX::V3";
+
+// Service for managing [Changelogs][google.cloud.dialogflow.cx.v3.Changelog].
+service Changelogs {
+  option (google.api.default_host) = "dialogflow.googleapis.com";
+  option (google.api.oauth_scopes) =
+      "https://www.googleapis.com/auth/cloud-platform,"
+      "https://www.googleapis.com/auth/dialogflow";
+
+  // Returns the list of Changelogs.
+  rpc ListChangelogs(ListChangelogsRequest) returns (ListChangelogsResponse) {
+    option (google.api.http) = {
+      get: "/v3/{parent=projects/*/locations/*/agents/*}/changelogs"
+    };
+    option (google.api.method_signature) = "parent";
+  }
+
+  // Retrieves the specified Changelog.
+  rpc GetChangelog(GetChangelogRequest) returns (Changelog) {
+    option (google.api.http) = {
+      get: "/v3/{name=projects/*/locations/*/agents/*/changelogs/*}"
+    };
+    option (google.api.method_signature) = "name";
+  }
+}
+
+// The request message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3.Changelogs.ListChangelogs].
+message ListChangelogsRequest {
+  // Required. The agent containing the changelogs.
+  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent ID>`.
+  string parent = 1 [
+    (google.api.field_behavior) = REQUIRED,
+    (google.api.resource_reference) = {
+      child_type: "dialogflow.googleapis.com/Changelog"
+    }
+  ];
+
+  // The filter string. Supports filter by user_email, resource, type and
+  // create_time. Some examples:
+  //   1. By user email:
+  //        user_email = "someone@google.com"
+  //   2. By resource name:
+  //        resource = "projects/123/locations/global/agents/456/flows/789"
+  //   3. By resource display name:
+  //        display_name = "my agent"
+  //   4. By action:
+  //        action = "Create"
+  //   5. By type:
+  //        type = "flows"
+  //   6. By create time. Currently predicates on `create_time` and
+  //      `create_time_epoch_seconds` are supported:
+  //        create_time_epoch_seconds > 1551790877 AND create_time <=
+  //        2017-01-15T01:30:15.01Z
+  //   7. Combination of above filters:
+  //        resource = "projects/123/locations/global/agents/456/flows/789"
+  //          AND user_email = "someone@google.com"
+  //          AND create_time <= 2017-01-15T01:30:15.01Z
+  string filter = 2;
+
+  // The maximum number of items to return in a single page. By default 100 and
+  // at most 1000.
+  int32 page_size = 3;
+
+  // The next_page_token value returned from a previous list request.
+  string page_token = 4;
+}
+
+// The response message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3.Changelogs.ListChangelogs].
+message ListChangelogsResponse {
+  // The list of changelogs. There will be a maximum number of items returned
+  // based on the page_size field in the request. The changelogs will be ordered
+  // by timestamp.
+  repeated Changelog changelogs = 1;
+
+  // Token to retrieve the next page of results, or empty if there are no more
+  // results in the list.
+  string next_page_token = 2;
+}
+
+// The request message for [Changelogs.GetChangelog][google.cloud.dialogflow.cx.v3.Changelogs.GetChangelog].
+message GetChangelogRequest {
+  // Required. The name of the changelog to get.
+  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent
+  // ID>/changelogs/<Changelog ID>`.
+  string name = 1 [
+    (google.api.field_behavior) = REQUIRED,
+    (google.api.resource_reference) = {
+      type: "dialogflow.googleapis.com/Changelog"
+    }
+  ];
+}
+
+// Changelogs represents a change made to a given agent.
+message Changelog {
+  option (google.api.resource) = {
+    type: "dialogflow.googleapis.com/Changelog"
+    pattern: "projects/{project}/locations/{location}/agents/{agent}/changelogs/{changelog}"
+  };
+
+  // The unique identifier of the changelog.
+  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent
+  // ID>/changelogs/<Changelog ID>`.
+  string name = 1;
+
+  // Email address of the authenticated user.
+  string user_email = 2;
+
+  // The affected resource display name of the change.
+  string display_name = 7;
+
+  // The action of the change.
+  string action = 11;
+
+  // The affected resource type.
+  string type = 8;
+
+  // The affected resource name of the change.
+  string resource = 3;
+
+  // The timestamp of the change.
+  google.protobuf.Timestamp create_time = 4;
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/session.proto b/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/session.proto
index 826c8b79b..46748b184 100644
--- a/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/session.proto
+++ b/proto-google-cloud-dialogflow-cx-v3/src/main/proto/google/cloud/dialogflow/cx/v3/session.proto
@@ -201,7 +201,7 @@ message DetectIntentResponse {
 // Multiple request messages should be sent in order:
 //
 // 1.  The first message must contain
-// [session][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.session],
+//     [session][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.session],
 //     [query_input][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.query_input] plus optionally
 //     [query_params][google.cloud.dialogflow.cx.v3.StreamingDetectIntentRequest.query_params]. If the client
 //     wants to receive an audio response, it should also contain
@@ -261,21 +261,29 @@ message StreamingDetectIntentRequest {
   bool enable_partial_response = 5;
 }
 
-// The top-level message returned from the `StreamingDetectIntent` method.
+// The top-level message returned from the
+// [StreamingDetectIntent][google.cloud.dialogflow.cx.v3.Sessions.StreamingDetectIntent] method.
 //
-// Multiple response messages can be returned in order:
+// Multiple response messages (N) can be returned in order.
 //
-// 1.  If the input was set to streaming audio, the first one or more messages
-//     contain `recognition_result`. Each `recognition_result` represents a more
-//     complete transcript of what the user said. The last `recognition_result`
-//     has `is_final` set to `true`.
+// The first (N-1) responses set either the `recognition_result` or
+// `detect_intent_response` field, depending on the request:
 //
-// 2.  If `enable_partial_response` is true, the following N messages
-//     (currently 1 <= N <= 4) contain `detect_intent_response`. The first (N-1)
-//     `detect_intent_response`s will have `response_type` set to `PARTIAL`.
-//     The last `detect_intent_response` has `response_type` set to `FINAL`.
-//     If `response_type` is false, response stream only contains
-//     the final `detect_intent_response`.
+// *   If the `StreamingDetectIntentRequest.query_input.audio` field was
+//     set, and the `StreamingDetectIntentRequest.enable_partial_response`
+//     field was false, the `recognition_result` field is populated for each
+//     of the (N-1) responses.
+//     See the [StreamingRecognitionResult][google.cloud.dialogflow.cx.v3.StreamingRecognitionResult] message for details
+//     about the result message sequence.
+//
+// *   If the `StreamingDetectIntentRequest.enable_partial_response` field was
+//     true, the `detect_intent_response` field is populated for each
+//     of the (N-1) responses, where 1 <= N <= 4.
+//     These responses set the [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3.DetectIntentResponse.response_type] field
+//     to `PARTIAL`.
+//
+// For the final Nth response message, the `detect_intent_response` is fully
+// populated, and [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3.DetectIntentResponse.response_type] is set to `FINAL`.
 message StreamingDetectIntentResponse {
   // The output response.
   oneof response {
@@ -291,35 +299,39 @@ message StreamingDetectIntentResponse {
 // that is currently being processed or an indication that this is the end
 // of the single requested utterance.
 //
-// Example:
-//
-// 1.  transcript: "tube"
-//
-// 2.  transcript: "to be a"
-//
-// 3.  transcript: "to be"
-//
-// 4.  transcript: "to be or not to be"
-//     is_final: true
-//
-// 5.  transcript: " that's"
-//
-// 6.  transcript: " that is"
-//
-// 7.  message_type: `END_OF_SINGLE_UTTERANCE`
+// While end-user audio is being processed, Dialogflow sends a series of
+// results. Each result may contain a `transcript` value. A transcript
+// represents a portion of the utterance. While the recognizer is processing
+// audio, transcript values may be interim values or finalized values.
+// Once a transcript is finalized, the `is_final` value is set to true and
+// processing continues for the next transcript.
 //
-// 8.  transcript: " that is the question"
-//     is_final: true
+// If `StreamingDetectIntentRequest.query_input.audio.config.single_utterance`
+// was true, and the recognizer has completed processing audio,
+// the `message_type` value is set to `END_OF_SINGLE_UTTERANCE and the
+// following (last) result contains the last finalized transcript.
 //
-// Only two of the responses contain final results (#4 and #8 indicated by
-// `is_final: true`). Concatenating these generates the full transcript: "to be
-// or not to be that is the question".
+// The complete end-user utterance is determined by concatenating the
+// finalized transcript values received for the series of results.
 //
-// In each response we populate:
+// In the following example, single utterance is enabled. In the case where
+// single utterance is not enabled, result 7 would not occur.
 //
-// *  for `TRANSCRIPT`: `transcript` and possibly `is_final`.
+// ```
+// Num | transcript              | message_type            | is_final
+// --- | ----------------------- | ----------------------- | --------
+// 1   | "tube"                  | TRANSCRIPT              | false
+// 2   | "to be a"               | TRANSCRIPT              | false
+// 3   | "to be"                 | TRANSCRIPT              | false
+// 4   | "to be or not to be"    | TRANSCRIPT              | true
+// 5   | "that's"                | TRANSCRIPT              | false
+// 6   | "that is                | TRANSCRIPT              | false
+// 7   | unset                   | END_OF_SINGLE_UTTERANCE | unset
+// 8   | " that is the question" | TRANSCRIPT              | true
+// ```
 //
-// *  for `END_OF_SINGLE_UTTERANCE`: only `message_type`.
+// Concatenating the finalized transcripts with `is_final` set to true,
+// the complete utterance becomes "to be or not to be that is the question".
 message StreamingRecognitionResult {
   // Type of the response message.
   enum MessageType {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Agent.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Agent.java
index 283d66888..ec372a252 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Agent.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Agent.java
@@ -893,35 +893,35 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDefaultLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(defaultLanguageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, defaultLanguageCode_);
     }
     for (int i = 0; i < supportedLanguageCodes_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(
           output, 4, supportedLanguageCodes_.getRaw(i));
     }
-    if (!getTimeZoneBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(timeZone_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, timeZone_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, description_);
     }
-    if (!getAvatarUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(avatarUri_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 7, avatarUri_);
     }
     if (speechToTextSettings_ != null) {
       output.writeMessage(13, getSpeechToTextSettings());
     }
-    if (!getStartFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(startFlow_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 16, startFlow_);
     }
-    if (!getSecuritySettingsBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(securitySettings_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 17, securitySettings_);
     }
     if (enableStackdriverLogging_ != false) {
@@ -942,13 +942,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDefaultLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(defaultLanguageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, defaultLanguageCode_);
     }
     {
@@ -959,23 +959,23 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getSupportedLanguageCodesList().size();
     }
-    if (!getTimeZoneBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(timeZone_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, timeZone_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, description_);
     }
-    if (!getAvatarUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(avatarUri_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, avatarUri_);
     }
     if (speechToTextSettings_ != null) {
       size +=
           com.google.protobuf.CodedOutputStream.computeMessageSize(13, getSpeechToTextSettings());
     }
-    if (!getStartFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(startFlow_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(16, startFlow_);
     }
-    if (!getSecuritySettingsBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(securitySettings_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(17, securitySettings_);
     }
     if (enableStackdriverLogging_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/AgentValidationResult.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/AgentValidationResult.java
index 7737a6fef..70bd429c4 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/AgentValidationResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/AgentValidationResult.java
@@ -281,7 +281,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     for (int i = 0; i < flowValidationResults_.size(); i++) {
@@ -296,7 +296,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     for (int i = 0; i < flowValidationResults_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/BatchDeleteTestCasesRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/BatchDeleteTestCasesRequest.java
index 77bb2c2d6..36ba27f41 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/BatchDeleteTestCasesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/BatchDeleteTestCasesRequest.java
@@ -268,7 +268,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     for (int i = 0; i < names_.size(); i++) {
@@ -283,7 +283,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/BatchRunTestCasesRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/BatchRunTestCasesRequest.java
index 56303b39c..e13b2c2d1 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/BatchRunTestCasesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/BatchRunTestCasesRequest.java
@@ -333,10 +333,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, environment_);
     }
     for (int i = 0; i < testCases_.size(); i++) {
@@ -351,10 +351,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, environment_);
     }
     {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CalculateCoverageRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CalculateCoverageRequest.java
index 83a97fd81..5393c21d1 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CalculateCoverageRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CalculateCoverageRequest.java
@@ -417,7 +417,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(2, type_);
     }
-    if (!getAgentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, agent_);
     }
     unknownFields.writeTo(output);
@@ -435,7 +435,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(2, type_);
     }
-    if (!getAgentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, agent_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CalculateCoverageResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CalculateCoverageResponse.java
index 24fba4b71..6ec6d6502 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CalculateCoverageResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CalculateCoverageResponse.java
@@ -459,7 +459,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
       output.writeMessage(
           4, (com.google.cloud.dialogflow.cx.v3beta1.TransitionCoverage) coverageType_);
     }
-    if (!getAgentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, agent_);
     }
     if (coverageTypeCase_ == 6) {
@@ -485,7 +485,7 @@ public int getSerializedSize() {
           com.google.protobuf.CodedOutputStream.computeMessageSize(
               4, (com.google.cloud.dialogflow.cx.v3beta1.TransitionCoverage) coverageType_);
     }
-    if (!getAgentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, agent_);
     }
     if (coverageTypeCase_ == 6) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Changelog.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Changelog.java
new file mode 100644
index 000000000..af10c4c63
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Changelog.java
@@ -0,0 +1,1816 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3beta1/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+/**
+ *
+ *
+ * <pre>
+ * Changelogs represents a change made to a given agent.
+ * </pre>
+ *
+ * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.Changelog}
+ */
+public final class Changelog extends com.google.protobuf.GeneratedMessageV3
+    implements
+    // @@protoc_insertion_point(message_implements:google.cloud.dialogflow.cx.v3beta1.Changelog)
+    ChangelogOrBuilder {
+  private static final long serialVersionUID = 0L;
+  // Use Changelog.newBuilder() to construct.
+  private Changelog(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+    super(builder);
+  }
+
+  private Changelog() {
+    name_ = "";
+    userEmail_ = "";
+    displayName_ = "";
+    action_ = "";
+    type_ = "";
+    resource_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+    return new Changelog();
+  }
+
+  @java.lang.Override
+  public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+    return this.unknownFields;
+  }
+
+  private Changelog(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    this();
+    if (extensionRegistry == null) {
+      throw new java.lang.NullPointerException();
+    }
+    com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+        com.google.protobuf.UnknownFieldSet.newBuilder();
+    try {
+      boolean done = false;
+      while (!done) {
+        int tag = input.readTag();
+        switch (tag) {
+          case 0:
+            done = true;
+            break;
+          case 10:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              name_ = s;
+              break;
+            }
+          case 18:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              userEmail_ = s;
+              break;
+            }
+          case 26:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              resource_ = s;
+              break;
+            }
+          case 34:
+            {
+              com.google.protobuf.Timestamp.Builder subBuilder = null;
+              if (createTime_ != null) {
+                subBuilder = createTime_.toBuilder();
+              }
+              createTime_ =
+                  input.readMessage(com.google.protobuf.Timestamp.parser(), extensionRegistry);
+              if (subBuilder != null) {
+                subBuilder.mergeFrom(createTime_);
+                createTime_ = subBuilder.buildPartial();
+              }
+
+              break;
+            }
+          case 58:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              displayName_ = s;
+              break;
+            }
+          case 66:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              type_ = s;
+              break;
+            }
+          case 90:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              action_ = s;
+              break;
+            }
+          default:
+            {
+              if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+        }
+      }
+    } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+      throw e.setUnfinishedMessage(this);
+    } catch (java.io.IOException e) {
+      throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+    } finally {
+      this.unknownFields = unknownFields.build();
+      makeExtensionsImmutable();
+    }
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+    return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3beta1_Changelog_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3beta1_Changelog_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            com.google.cloud.dialogflow.cx.v3beta1.Changelog.class,
+            com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder.class);
+  }
+
+  public static final int NAME_FIELD_NUMBER = 1;
+  private volatile java.lang.Object name_;
+  /**
+   *
+   *
+   * <pre>
+   * The unique identifier of the changelog.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>string name = 1;</code>
+   *
+   * @return The name.
+   */
+  @java.lang.Override
+  public java.lang.String getName() {
+    java.lang.Object ref = name_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      name_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The unique identifier of the changelog.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>string name = 1;</code>
+   *
+   * @return The bytes for name.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getNameBytes() {
+    java.lang.Object ref = name_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      name_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int USER_EMAIL_FIELD_NUMBER = 2;
+  private volatile java.lang.Object userEmail_;
+  /**
+   *
+   *
+   * <pre>
+   * Email address of the authenticated user.
+   * </pre>
+   *
+   * <code>string user_email = 2;</code>
+   *
+   * @return The userEmail.
+   */
+  @java.lang.Override
+  public java.lang.String getUserEmail() {
+    java.lang.Object ref = userEmail_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      userEmail_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Email address of the authenticated user.
+   * </pre>
+   *
+   * <code>string user_email = 2;</code>
+   *
+   * @return The bytes for userEmail.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getUserEmailBytes() {
+    java.lang.Object ref = userEmail_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      userEmail_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int DISPLAY_NAME_FIELD_NUMBER = 7;
+  private volatile java.lang.Object displayName_;
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource display name of the change.
+   * </pre>
+   *
+   * <code>string display_name = 7;</code>
+   *
+   * @return The displayName.
+   */
+  @java.lang.Override
+  public java.lang.String getDisplayName() {
+    java.lang.Object ref = displayName_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      displayName_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource display name of the change.
+   * </pre>
+   *
+   * <code>string display_name = 7;</code>
+   *
+   * @return The bytes for displayName.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getDisplayNameBytes() {
+    java.lang.Object ref = displayName_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      displayName_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int ACTION_FIELD_NUMBER = 11;
+  private volatile java.lang.Object action_;
+  /**
+   *
+   *
+   * <pre>
+   * The action of the change.
+   * </pre>
+   *
+   * <code>string action = 11;</code>
+   *
+   * @return The action.
+   */
+  @java.lang.Override
+  public java.lang.String getAction() {
+    java.lang.Object ref = action_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      action_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The action of the change.
+   * </pre>
+   *
+   * <code>string action = 11;</code>
+   *
+   * @return The bytes for action.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getActionBytes() {
+    java.lang.Object ref = action_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      action_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int TYPE_FIELD_NUMBER = 8;
+  private volatile java.lang.Object type_;
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource type.
+   * </pre>
+   *
+   * <code>string type = 8;</code>
+   *
+   * @return The type.
+   */
+  @java.lang.Override
+  public java.lang.String getType() {
+    java.lang.Object ref = type_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      type_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource type.
+   * </pre>
+   *
+   * <code>string type = 8;</code>
+   *
+   * @return The bytes for type.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getTypeBytes() {
+    java.lang.Object ref = type_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      type_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int RESOURCE_FIELD_NUMBER = 3;
+  private volatile java.lang.Object resource_;
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource name of the change.
+   * </pre>
+   *
+   * <code>string resource = 3;</code>
+   *
+   * @return The resource.
+   */
+  @java.lang.Override
+  public java.lang.String getResource() {
+    java.lang.Object ref = resource_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      resource_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource name of the change.
+   * </pre>
+   *
+   * <code>string resource = 3;</code>
+   *
+   * @return The bytes for resource.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getResourceBytes() {
+    java.lang.Object ref = resource_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      resource_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int CREATE_TIME_FIELD_NUMBER = 4;
+  private com.google.protobuf.Timestamp createTime_;
+  /**
+   *
+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   *
+   * @return Whether the createTime field is set.
+   */
+  @java.lang.Override
+  public boolean hasCreateTime() {
+    return createTime_ != null;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   *
+   * @return The createTime.
+   */
+  @java.lang.Override
+  public com.google.protobuf.Timestamp getCreateTime() {
+    return createTime_ == null ? com.google.protobuf.Timestamp.getDefaultInstance() : createTime_;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   */
+  @java.lang.Override
+  public com.google.protobuf.TimestampOrBuilder getCreateTimeOrBuilder() {
+    return getCreateTime();
+  }
+
+  private byte memoizedIsInitialized = -1;
+
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(userEmail_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, userEmail_);
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(resource_)) {
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+  public int getSerializedSize() {
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+    }
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+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, displayName_);
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(type_)) {
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+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(action_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(11, action_);
+    }
+    size += unknownFields.getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (!(obj instanceof com.google.cloud.dialogflow.cx.v3beta1.Changelog)) {
+      return super.equals(obj);
+    }
+    com.google.cloud.dialogflow.cx.v3beta1.Changelog other =
+        (com.google.cloud.dialogflow.cx.v3beta1.Changelog) obj;
+
+    if (!getName().equals(other.getName())) return false;
+    if (!getUserEmail().equals(other.getUserEmail())) return false;
+    if (!getDisplayName().equals(other.getDisplayName())) return false;
+    if (!getAction().equals(other.getAction())) return false;
+    if (!getType().equals(other.getType())) return false;
+    if (!getResource().equals(other.getResource())) return false;
+    if (hasCreateTime() != other.hasCreateTime()) return false;
+    if (hasCreateTime()) {
+      if (!getCreateTime().equals(other.getCreateTime())) return false;
+    }
+    if (!unknownFields.equals(other.unknownFields)) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    hash = (37 * hash) + NAME_FIELD_NUMBER;
+    hash = (53 * hash) + getName().hashCode();
+    hash = (37 * hash) + USER_EMAIL_FIELD_NUMBER;
+    hash = (53 * hash) + getUserEmail().hashCode();
+    hash = (37 * hash) + DISPLAY_NAME_FIELD_NUMBER;
+    hash = (53 * hash) + getDisplayName().hashCode();
+    hash = (37 * hash) + ACTION_FIELD_NUMBER;
+    hash = (53 * hash) + getAction().hashCode();
+    hash = (37 * hash) + TYPE_FIELD_NUMBER;
+    hash = (53 * hash) + getType().hashCode();
+    hash = (37 * hash) + RESOURCE_FIELD_NUMBER;
+    hash = (53 * hash) + getResource().hashCode();
+    if (hasCreateTime()) {
+      hash = (37 * hash) + CREATE_TIME_FIELD_NUMBER;
+      hash = (53 * hash) + getCreateTime().hashCode();
+    }
+    hash = (29 * hash) + unknownFields.hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseFrom(java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseFrom(
+      java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseFrom(
+      byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseDelimitedFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseDelimitedFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseFrom(
+      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() {
+    return newBuilder();
+  }
+
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+
+  public static Builder newBuilder(com.google.cloud.dialogflow.cx.v3beta1.Changelog prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Changelogs represents a change made to a given agent.
+   * </pre>
+   *
+   * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.Changelog}
+   */
+  public static final class Builder extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+      implements
+      // @@protoc_insertion_point(builder_implements:google.cloud.dialogflow.cx.v3beta1.Changelog)
+      com.google.cloud.dialogflow.cx.v3beta1.ChangelogOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_Changelog_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_Changelog_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              com.google.cloud.dialogflow.cx.v3beta1.Changelog.class,
+              com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder.class);
+    }
+
+    // Construct using com.google.cloud.dialogflow.cx.v3beta1.Changelog.newBuilder()
+    private Builder() {
+      maybeForceBuilderInitialization();
+    }
+
+    private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+      maybeForceBuilderInitialization();
+    }
+
+    private void maybeForceBuilderInitialization() {
+      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+    }
+
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      name_ = "";
+
+      userEmail_ = "";
+
+      displayName_ = "";
+
+      action_ = "";
+
+      type_ = "";
+
+      resource_ = "";
+
+      if (createTimeBuilder_ == null) {
+        createTime_ = null;
+      } else {
+        createTime_ = null;
+        createTimeBuilder_ = null;
+      }
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_Changelog_descriptor;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.Changelog getDefaultInstanceForType() {
+      return com.google.cloud.dialogflow.cx.v3beta1.Changelog.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.Changelog build() {
+      com.google.cloud.dialogflow.cx.v3beta1.Changelog result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.Changelog buildPartial() {
+      com.google.cloud.dialogflow.cx.v3beta1.Changelog result =
+          new com.google.cloud.dialogflow.cx.v3beta1.Changelog(this);
+      result.name_ = name_;
+      result.userEmail_ = userEmail_;
+      result.displayName_ = displayName_;
+      result.action_ = action_;
+      result.type_ = type_;
+      result.resource_ = resource_;
+      if (createTimeBuilder_ == null) {
+        result.createTime_ = createTime_;
+      } else {
+        result.createTime_ = createTimeBuilder_.build();
+      }
+      onBuilt();
+      return result;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.setField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+
+    @java.lang.Override
+    public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof com.google.cloud.dialogflow.cx.v3beta1.Changelog) {
+        return mergeFrom((com.google.cloud.dialogflow.cx.v3beta1.Changelog) other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(com.google.cloud.dialogflow.cx.v3beta1.Changelog other) {
+      if (other == com.google.cloud.dialogflow.cx.v3beta1.Changelog.getDefaultInstance())
+        return this;
+      if (!other.getName().isEmpty()) {
+        name_ = other.name_;
+        onChanged();
+      }
+      if (!other.getUserEmail().isEmpty()) {
+        userEmail_ = other.userEmail_;
+        onChanged();
+      }
+      if (!other.getDisplayName().isEmpty()) {
+        displayName_ = other.displayName_;
+        onChanged();
+      }
+      if (!other.getAction().isEmpty()) {
+        action_ = other.action_;
+        onChanged();
+      }
+      if (!other.getType().isEmpty()) {
+        type_ = other.type_;
+        onChanged();
+      }
+      if (!other.getResource().isEmpty()) {
+        resource_ = other.resource_;
+        onChanged();
+      }
+      if (other.hasCreateTime()) {
+        mergeCreateTime(other.getCreateTime());
+      }
+      this.mergeUnknownFields(other.unknownFields);
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      com.google.cloud.dialogflow.cx.v3beta1.Changelog parsedMessage = null;
+      try {
+        parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        parsedMessage = (com.google.cloud.dialogflow.cx.v3beta1.Changelog) e.getUnfinishedMessage();
+        throw e.unwrapIOException();
+      } finally {
+        if (parsedMessage != null) {
+          mergeFrom(parsedMessage);
+        }
+      }
+      return this;
+    }
+
+    private java.lang.Object name_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The unique identifier of the changelog.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>string name = 1;</code>
+     *
+     * @return The name.
+     */
+    public java.lang.String getName() {
+      java.lang.Object ref = name_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        name_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The unique identifier of the changelog.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>string name = 1;</code>
+     *
+     * @return The bytes for name.
+     */
+    public com.google.protobuf.ByteString getNameBytes() {
+      java.lang.Object ref = name_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        name_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The unique identifier of the changelog.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>string name = 1;</code>
+     *
+     * @param value The name to set.
+     * @return This builder for chaining.
+     */
+    public Builder setName(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      name_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The unique identifier of the changelog.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>string name = 1;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearName() {
+
+      name_ = getDefaultInstance().getName();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The unique identifier of the changelog.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>string name = 1;</code>
+     *
+     * @param value The bytes for name to set.
+     * @return This builder for chaining.
+     */
+    public Builder setNameBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      name_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object userEmail_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * Email address of the authenticated user.
+     * </pre>
+     *
+     * <code>string user_email = 2;</code>
+     *
+     * @return The userEmail.
+     */
+    public java.lang.String getUserEmail() {
+      java.lang.Object ref = userEmail_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        userEmail_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Email address of the authenticated user.
+     * </pre>
+     *
+     * <code>string user_email = 2;</code>
+     *
+     * @return The bytes for userEmail.
+     */
+    public com.google.protobuf.ByteString getUserEmailBytes() {
+      java.lang.Object ref = userEmail_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        userEmail_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Email address of the authenticated user.
+     * </pre>
+     *
+     * <code>string user_email = 2;</code>
+     *
+     * @param value The userEmail to set.
+     * @return This builder for chaining.
+     */
+    public Builder setUserEmail(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      userEmail_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Email address of the authenticated user.
+     * </pre>
+     *
+     * <code>string user_email = 2;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearUserEmail() {
+
+      userEmail_ = getDefaultInstance().getUserEmail();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Email address of the authenticated user.
+     * </pre>
+     *
+     * <code>string user_email = 2;</code>
+     *
+     * @param value The bytes for userEmail to set.
+     * @return This builder for chaining.
+     */
+    public Builder setUserEmailBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      userEmail_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object displayName_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource display name of the change.
+     * </pre>
+     *
+     * <code>string display_name = 7;</code>
+     *
+     * @return The displayName.
+     */
+    public java.lang.String getDisplayName() {
+      java.lang.Object ref = displayName_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        displayName_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource display name of the change.
+     * </pre>
+     *
+     * <code>string display_name = 7;</code>
+     *
+     * @return The bytes for displayName.
+     */
+    public com.google.protobuf.ByteString getDisplayNameBytes() {
+      java.lang.Object ref = displayName_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        displayName_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource display name of the change.
+     * </pre>
+     *
+     * <code>string display_name = 7;</code>
+     *
+     * @param value The displayName to set.
+     * @return This builder for chaining.
+     */
+    public Builder setDisplayName(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      displayName_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource display name of the change.
+     * </pre>
+     *
+     * <code>string display_name = 7;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearDisplayName() {
+
+      displayName_ = getDefaultInstance().getDisplayName();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource display name of the change.
+     * </pre>
+     *
+     * <code>string display_name = 7;</code>
+     *
+     * @param value The bytes for displayName to set.
+     * @return This builder for chaining.
+     */
+    public Builder setDisplayNameBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      displayName_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object action_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The action of the change.
+     * </pre>
+     *
+     * <code>string action = 11;</code>
+     *
+     * @return The action.
+     */
+    public java.lang.String getAction() {
+      java.lang.Object ref = action_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        action_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The action of the change.
+     * </pre>
+     *
+     * <code>string action = 11;</code>
+     *
+     * @return The bytes for action.
+     */
+    public com.google.protobuf.ByteString getActionBytes() {
+      java.lang.Object ref = action_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        action_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The action of the change.
+     * </pre>
+     *
+     * <code>string action = 11;</code>
+     *
+     * @param value The action to set.
+     * @return This builder for chaining.
+     */
+    public Builder setAction(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      action_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The action of the change.
+     * </pre>
+     *
+     * <code>string action = 11;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearAction() {
+
+      action_ = getDefaultInstance().getAction();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The action of the change.
+     * </pre>
+     *
+     * <code>string action = 11;</code>
+     *
+     * @param value The bytes for action to set.
+     * @return This builder for chaining.
+     */
+    public Builder setActionBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      action_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object type_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource type.
+     * </pre>
+     *
+     * <code>string type = 8;</code>
+     *
+     * @return The type.
+     */
+    public java.lang.String getType() {
+      java.lang.Object ref = type_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        type_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource type.
+     * </pre>
+     *
+     * <code>string type = 8;</code>
+     *
+     * @return The bytes for type.
+     */
+    public com.google.protobuf.ByteString getTypeBytes() {
+      java.lang.Object ref = type_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        type_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource type.
+     * </pre>
+     *
+     * <code>string type = 8;</code>
+     *
+     * @param value The type to set.
+     * @return This builder for chaining.
+     */
+    public Builder setType(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      type_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource type.
+     * </pre>
+     *
+     * <code>string type = 8;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearType() {
+
+      type_ = getDefaultInstance().getType();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource type.
+     * </pre>
+     *
+     * <code>string type = 8;</code>
+     *
+     * @param value The bytes for type to set.
+     * @return This builder for chaining.
+     */
+    public Builder setTypeBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      type_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object resource_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource name of the change.
+     * </pre>
+     *
+     * <code>string resource = 3;</code>
+     *
+     * @return The resource.
+     */
+    public java.lang.String getResource() {
+      java.lang.Object ref = resource_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        resource_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource name of the change.
+     * </pre>
+     *
+     * <code>string resource = 3;</code>
+     *
+     * @return The bytes for resource.
+     */
+    public com.google.protobuf.ByteString getResourceBytes() {
+      java.lang.Object ref = resource_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        resource_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource name of the change.
+     * </pre>
+     *
+     * <code>string resource = 3;</code>
+     *
+     * @param value The resource to set.
+     * @return This builder for chaining.
+     */
+    public Builder setResource(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      resource_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource name of the change.
+     * </pre>
+     *
+     * <code>string resource = 3;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearResource() {
+
+      resource_ = getDefaultInstance().getResource();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The affected resource name of the change.
+     * </pre>
+     *
+     * <code>string resource = 3;</code>
+     *
+     * @param value The bytes for resource to set.
+     * @return This builder for chaining.
+     */
+    public Builder setResourceBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      resource_ = value;
+      onChanged();
+      return this;
+    }
+
+    private com.google.protobuf.Timestamp createTime_;
+    private com.google.protobuf.SingleFieldBuilderV3<
+            com.google.protobuf.Timestamp,
+            com.google.protobuf.Timestamp.Builder,
+            com.google.protobuf.TimestampOrBuilder>
+        createTimeBuilder_;
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     *
+     * @return Whether the createTime field is set.
+     */
+    public boolean hasCreateTime() {
+      return createTimeBuilder_ != null || createTime_ != null;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     *
+     * @return The createTime.
+     */
+    public com.google.protobuf.Timestamp getCreateTime() {
+      if (createTimeBuilder_ == null) {
+        return createTime_ == null
+            ? com.google.protobuf.Timestamp.getDefaultInstance()
+            : createTime_;
+      } else {
+        return createTimeBuilder_.getMessage();
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public Builder setCreateTime(com.google.protobuf.Timestamp value) {
+      if (createTimeBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        createTime_ = value;
+        onChanged();
+      } else {
+        createTimeBuilder_.setMessage(value);
+      }
+
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public Builder setCreateTime(com.google.protobuf.Timestamp.Builder builderForValue) {
+      if (createTimeBuilder_ == null) {
+        createTime_ = builderForValue.build();
+        onChanged();
+      } else {
+        createTimeBuilder_.setMessage(builderForValue.build());
+      }
+
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public Builder mergeCreateTime(com.google.protobuf.Timestamp value) {
+      if (createTimeBuilder_ == null) {
+        if (createTime_ != null) {
+          createTime_ =
+              com.google.protobuf.Timestamp.newBuilder(createTime_).mergeFrom(value).buildPartial();
+        } else {
+          createTime_ = value;
+        }
+        onChanged();
+      } else {
+        createTimeBuilder_.mergeFrom(value);
+      }
+
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public Builder clearCreateTime() {
+      if (createTimeBuilder_ == null) {
+        createTime_ = null;
+        onChanged();
+      } else {
+        createTime_ = null;
+        createTimeBuilder_ = null;
+      }
+
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public com.google.protobuf.Timestamp.Builder getCreateTimeBuilder() {
+
+      onChanged();
+      return getCreateTimeFieldBuilder().getBuilder();
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    public com.google.protobuf.TimestampOrBuilder getCreateTimeOrBuilder() {
+      if (createTimeBuilder_ != null) {
+        return createTimeBuilder_.getMessageOrBuilder();
+      } else {
+        return createTime_ == null
+            ? com.google.protobuf.Timestamp.getDefaultInstance()
+            : createTime_;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The timestamp of the change.
+     * </pre>
+     *
+     * <code>.google.protobuf.Timestamp create_time = 4;</code>
+     */
+    private com.google.protobuf.SingleFieldBuilderV3<
+            com.google.protobuf.Timestamp,
+            com.google.protobuf.Timestamp.Builder,
+            com.google.protobuf.TimestampOrBuilder>
+        getCreateTimeFieldBuilder() {
+      if (createTimeBuilder_ == null) {
+        createTimeBuilder_ =
+            new com.google.protobuf.SingleFieldBuilderV3<
+                com.google.protobuf.Timestamp,
+                com.google.protobuf.Timestamp.Builder,
+                com.google.protobuf.TimestampOrBuilder>(
+                getCreateTime(), getParentForChildren(), isClean());
+        createTime_ = null;
+      }
+      return createTimeBuilder_;
+    }
+
+    @java.lang.Override
+    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+    // @@protoc_insertion_point(builder_scope:google.cloud.dialogflow.cx.v3beta1.Changelog)
+  }
+
+  // @@protoc_insertion_point(class_scope:google.cloud.dialogflow.cx.v3beta1.Changelog)
+  private static final com.google.cloud.dialogflow.cx.v3beta1.Changelog DEFAULT_INSTANCE;
+
+  static {
+    DEFAULT_INSTANCE = new com.google.cloud.dialogflow.cx.v3beta1.Changelog();
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.Changelog getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser<Changelog> PARSER =
+      new com.google.protobuf.AbstractParser<Changelog>() {
+        @java.lang.Override
+        public Changelog parsePartialFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws com.google.protobuf.InvalidProtocolBufferException {
+          return new Changelog(input, extensionRegistry);
+        }
+      };
+
+  public static com.google.protobuf.Parser<Changelog> parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser<Changelog> getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3beta1.Changelog getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogName.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogName.java
new file mode 100644
index 000000000..cf2d61114
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogName.java
@@ -0,0 +1,257 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+import com.google.api.pathtemplate.PathTemplate;
+import com.google.api.resourcenames.ResourceName;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableMap;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+@Generated("by gapic-generator-java")
+public class ChangelogName implements ResourceName {
+  private static final PathTemplate PROJECT_LOCATION_AGENT_CHANGELOG =
+      PathTemplate.createWithoutUrlEncoding(
+          "projects/{project}/locations/{location}/agents/{agent}/changelogs/{changelog}");
+  private volatile Map<String, String> fieldValuesMap;
+  private final String project;
+  private final String location;
+  private final String agent;
+  private final String changelog;
+
+  @Deprecated
+  protected ChangelogName() {
+    project = null;
+    location = null;
+    agent = null;
+    changelog = null;
+  }
+
+  private ChangelogName(Builder builder) {
+    project = Preconditions.checkNotNull(builder.getProject());
+    location = Preconditions.checkNotNull(builder.getLocation());
+    agent = Preconditions.checkNotNull(builder.getAgent());
+    changelog = Preconditions.checkNotNull(builder.getChangelog());
+  }
+
+  public String getProject() {
+    return project;
+  }
+
+  public String getLocation() {
+    return location;
+  }
+
+  public String getAgent() {
+    return agent;
+  }
+
+  public String getChangelog() {
+    return changelog;
+  }
+
+  public static Builder newBuilder() {
+    return new Builder();
+  }
+
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  public static ChangelogName of(String project, String location, String agent, String changelog) {
+    return newBuilder()
+        .setProject(project)
+        .setLocation(location)
+        .setAgent(agent)
+        .setChangelog(changelog)
+        .build();
+  }
+
+  public static String format(String project, String location, String agent, String changelog) {
+    return newBuilder()
+        .setProject(project)
+        .setLocation(location)
+        .setAgent(agent)
+        .setChangelog(changelog)
+        .build()
+        .toString();
+  }
+
+  public static ChangelogName parse(String formattedString) {
+    if (formattedString.isEmpty()) {
+      return null;
+    }
+    Map<String, String> matchMap =
+        PROJECT_LOCATION_AGENT_CHANGELOG.validatedMatch(
+            formattedString, "ChangelogName.parse: formattedString not in valid format");
+    return of(
+        matchMap.get("project"),
+        matchMap.get("location"),
+        matchMap.get("agent"),
+        matchMap.get("changelog"));
+  }
+
+  public static List<ChangelogName> parseList(List<String> formattedStrings) {
+    List<ChangelogName> list = new ArrayList<>(formattedStrings.size());
+    for (String formattedString : formattedStrings) {
+      list.add(parse(formattedString));
+    }
+    return list;
+  }
+
+  public static List<String> toStringList(List<ChangelogName> values) {
+    List<String> list = new ArrayList<>(values.size());
+    for (ChangelogName value : values) {
+      if (value == null) {
+        list.add("");
+      } else {
+        list.add(value.toString());
+      }
+    }
+    return list;
+  }
+
+  public static boolean isParsableFrom(String formattedString) {
+    return PROJECT_LOCATION_AGENT_CHANGELOG.matches(formattedString);
+  }
+
+  @Override
+  public Map<String, String> getFieldValuesMap() {
+    if (fieldValuesMap == null) {
+      synchronized (this) {
+        if (fieldValuesMap == null) {
+          ImmutableMap.Builder<String, String> fieldMapBuilder = ImmutableMap.builder();
+          if (project != null) {
+            fieldMapBuilder.put("project", project);
+          }
+          if (location != null) {
+            fieldMapBuilder.put("location", location);
+          }
+          if (agent != null) {
+            fieldMapBuilder.put("agent", agent);
+          }
+          if (changelog != null) {
+            fieldMapBuilder.put("changelog", changelog);
+          }
+          fieldValuesMap = fieldMapBuilder.build();
+        }
+      }
+    }
+    return fieldValuesMap;
+  }
+
+  public String getFieldValue(String fieldName) {
+    return getFieldValuesMap().get(fieldName);
+  }
+
+  @Override
+  public String toString() {
+    return PROJECT_LOCATION_AGENT_CHANGELOG.instantiate(
+        "project", project, "location", location, "agent", agent, "changelog", changelog);
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (o == this) {
+      return true;
+    }
+    if (o != null || getClass() == o.getClass()) {
+      ChangelogName that = ((ChangelogName) o);
+      return Objects.equals(this.project, that.project)
+          && Objects.equals(this.location, that.location)
+          && Objects.equals(this.agent, that.agent)
+          && Objects.equals(this.changelog, that.changelog);
+    }
+    return false;
+  }
+
+  @Override
+  public int hashCode() {
+    int h = 1;
+    h *= 1000003;
+    h ^= Objects.hashCode(project);
+    h *= 1000003;
+    h ^= Objects.hashCode(location);
+    h *= 1000003;
+    h ^= Objects.hashCode(agent);
+    h *= 1000003;
+    h ^= Objects.hashCode(changelog);
+    return h;
+  }
+
+  /** Builder for projects/{project}/locations/{location}/agents/{agent}/changelogs/{changelog}. */
+  public static class Builder {
+    private String project;
+    private String location;
+    private String agent;
+    private String changelog;
+
+    protected Builder() {}
+
+    public String getProject() {
+      return project;
+    }
+
+    public String getLocation() {
+      return location;
+    }
+
+    public String getAgent() {
+      return agent;
+    }
+
+    public String getChangelog() {
+      return changelog;
+    }
+
+    public Builder setProject(String project) {
+      this.project = project;
+      return this;
+    }
+
+    public Builder setLocation(String location) {
+      this.location = location;
+      return this;
+    }
+
+    public Builder setAgent(String agent) {
+      this.agent = agent;
+      return this;
+    }
+
+    public Builder setChangelog(String changelog) {
+      this.changelog = changelog;
+      return this;
+    }
+
+    private Builder(ChangelogName changelogName) {
+      this.project = changelogName.project;
+      this.location = changelogName.location;
+      this.agent = changelogName.agent;
+      this.changelog = changelogName.changelog;
+    }
+
+    public ChangelogName build() {
+      return new ChangelogName(this);
+    }
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogOrBuilder.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogOrBuilder.java
new file mode 100644
index 000000000..e9d849b07
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogOrBuilder.java
@@ -0,0 +1,214 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3beta1/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+public interface ChangelogOrBuilder
+    extends
+    // @@protoc_insertion_point(interface_extends:google.cloud.dialogflow.cx.v3beta1.Changelog)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   *
+   *
+   * <pre>
+   * The unique identifier of the changelog.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>string name = 1;</code>
+   *
+   * @return The name.
+   */
+  java.lang.String getName();
+  /**
+   *
+   *
+   * <pre>
+   * The unique identifier of the changelog.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>string name = 1;</code>
+   *
+   * @return The bytes for name.
+   */
+  com.google.protobuf.ByteString getNameBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * Email address of the authenticated user.
+   * </pre>
+   *
+   * <code>string user_email = 2;</code>
+   *
+   * @return The userEmail.
+   */
+  java.lang.String getUserEmail();
+  /**
+   *
+   *
+   * <pre>
+   * Email address of the authenticated user.
+   * </pre>
+   *
+   * <code>string user_email = 2;</code>
+   *
+   * @return The bytes for userEmail.
+   */
+  com.google.protobuf.ByteString getUserEmailBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource display name of the change.
+   * </pre>
+   *
+   * <code>string display_name = 7;</code>
+   *
+   * @return The displayName.
+   */
+  java.lang.String getDisplayName();
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource display name of the change.
+   * </pre>
+   *
+   * <code>string display_name = 7;</code>
+   *
+   * @return The bytes for displayName.
+   */
+  com.google.protobuf.ByteString getDisplayNameBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The action of the change.
+   * </pre>
+   *
+   * <code>string action = 11;</code>
+   *
+   * @return The action.
+   */
+  java.lang.String getAction();
+  /**
+   *
+   *
+   * <pre>
+   * The action of the change.
+   * </pre>
+   *
+   * <code>string action = 11;</code>
+   *
+   * @return The bytes for action.
+   */
+  com.google.protobuf.ByteString getActionBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource type.
+   * </pre>
+   *
+   * <code>string type = 8;</code>
+   *
+   * @return The type.
+   */
+  java.lang.String getType();
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource type.
+   * </pre>
+   *
+   * <code>string type = 8;</code>
+   *
+   * @return The bytes for type.
+   */
+  com.google.protobuf.ByteString getTypeBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource name of the change.
+   * </pre>
+   *
+   * <code>string resource = 3;</code>
+   *
+   * @return The resource.
+   */
+  java.lang.String getResource();
+  /**
+   *
+   *
+   * <pre>
+   * The affected resource name of the change.
+   * </pre>
+   *
+   * <code>string resource = 3;</code>
+   *
+   * @return The bytes for resource.
+   */
+  com.google.protobuf.ByteString getResourceBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   *
+   * @return Whether the createTime field is set.
+   */
+  boolean hasCreateTime();
+  /**
+   *
+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   *
+   * @return The createTime.
+   */
+  com.google.protobuf.Timestamp getCreateTime();
+  /**
+   *
+   *
+   * <pre>
+   * The timestamp of the change.
+   * </pre>
+   *
+   * <code>.google.protobuf.Timestamp create_time = 4;</code>
+   */
+  com.google.protobuf.TimestampOrBuilder getCreateTimeOrBuilder();
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogProto.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogProto.java
new file mode 100644
index 000000000..66b2e7b0c
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ChangelogProto.java
@@ -0,0 +1,161 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3beta1/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+public final class ChangelogProto {
+  private ChangelogProto() {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {}
+
+  public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions((com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+
+  static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsRequest_descriptor;
+  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsRequest_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsResponse_descriptor;
+  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsResponse_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_google_cloud_dialogflow_cx_v3beta1_GetChangelogRequest_descriptor;
+  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_google_cloud_dialogflow_cx_v3beta1_GetChangelogRequest_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_google_cloud_dialogflow_cx_v3beta1_Changelog_descriptor;
+  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_google_cloud_dialogflow_cx_v3beta1_Changelog_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
+    return descriptor;
+  }
+
+  private static com.google.protobuf.Descriptors.FileDescriptor descriptor;
+
+  static {
+    java.lang.String[] descriptorData = {
+      "\n2google/cloud/dialogflow/cx/v3beta1/cha"
+          + "ngelog.proto\022\"google.cloud.dialogflow.cx"
+          + ".v3beta1\032\034google/api/annotations.proto\032\027"
+          + "google/api/client.proto\032\037google/api/fiel"
+          + "d_behavior.proto\032\031google/api/resource.pr"
+          + "oto\032\034google/protobuf/struct.proto\032\037googl"
+          + "e/protobuf/timestamp.proto\"\213\001\n\025ListChang"
+          + "elogsRequest\022;\n\006parent\030\001 \001(\tB+\340A\002\372A%\022#di"
+          + "alogflow.googleapis.com/Changelog\022\016\n\006fil"
+          + "ter\030\002 \001(\t\022\021\n\tpage_size\030\003 \001(\005\022\022\n\npage_tok"
+          + "en\030\004 \001(\t\"t\n\026ListChangelogsResponse\022A\n\nch"
+          + "angelogs\030\001 \003(\0132-.google.cloud.dialogflow"
+          + ".cx.v3beta1.Changelog\022\027\n\017next_page_token"
+          + "\030\002 \001(\t\"P\n\023GetChangelogRequest\0229\n\004name\030\001 "
+          + "\001(\tB+\340A\002\372A%\n#dialogflow.googleapis.com/C"
+          + "hangelog\"\235\002\n\tChangelog\022\014\n\004name\030\001 \001(\t\022\022\n\n"
+          + "user_email\030\002 \001(\t\022\024\n\014display_name\030\007 \001(\t\022\016"
+          + "\n\006action\030\013 \001(\t\022\014\n\004type\030\010 \001(\t\022\020\n\010resource"
+          + "\030\003 \001(\t\022/\n\013create_time\030\004 \001(\0132\032.google.pro"
+          + "tobuf.Timestamp:w\352At\n#dialogflow.googlea"
+          + "pis.com/Changelog\022Mprojects/{project}/lo"
+          + "cations/{location}/agents/{agent}/change"
+          + "logs/{changelog}2\245\004\n\nChangelogs\022\326\001\n\016List"
+          + "Changelogs\0229.google.cloud.dialogflow.cx."
+          + "v3beta1.ListChangelogsRequest\032:.google.c"
+          + "loud.dialogflow.cx.v3beta1.ListChangelog"
+          + "sResponse\"M\202\323\344\223\002>\022</v3beta1/{parent=proj"
+          + "ects/*/locations/*/agents/*}/changelogs\332"
+          + "A\006parent\022\303\001\n\014GetChangelog\0227.google.cloud"
+          + ".dialogflow.cx.v3beta1.GetChangelogReque"
+          + "st\032-.google.cloud.dialogflow.cx.v3beta1."
+          + "Changelog\"K\202\323\344\223\002>\022</v3beta1/{name=projec"
+          + "ts/*/locations/*/agents/*/changelogs/*}\332"
+          + "A\004name\032x\312A\031dialogflow.googleapis.com\322AYh"
+          + "ttps://www.googleapis.com/auth/cloud-pla"
+          + "tform,https://www.googleapis.com/auth/di"
+          + "alogflowB\326\001\n&com.google.cloud.dialogflow"
+          + ".cx.v3beta1B\016ChangelogProtoP\001ZDgoogle.go"
+          + "lang.org/genproto/googleapis/cloud/dialo"
+          + "gflow/cx/v3beta1;cx\370\001\001\242\002\002DF\252\002\"Google.Clo"
+          + "ud.Dialogflow.Cx.V3Beta1\352\002&Google::Cloud"
+          + "::Dialogflow::CX::V3beta1b\006proto3"
+    };
+    descriptor =
+        com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
+            descriptorData,
+            new com.google.protobuf.Descriptors.FileDescriptor[] {
+              com.google.api.AnnotationsProto.getDescriptor(),
+              com.google.api.ClientProto.getDescriptor(),
+              com.google.api.FieldBehaviorProto.getDescriptor(),
+              com.google.api.ResourceProto.getDescriptor(),
+              com.google.protobuf.StructProto.getDescriptor(),
+              com.google.protobuf.TimestampProto.getDescriptor(),
+            });
+    internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsRequest_descriptor =
+        getDescriptor().getMessageTypes().get(0);
+    internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsRequest_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsRequest_descriptor,
+            new java.lang.String[] {
+              "Parent", "Filter", "PageSize", "PageToken",
+            });
+    internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsResponse_descriptor =
+        getDescriptor().getMessageTypes().get(1);
+    internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsResponse_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsResponse_descriptor,
+            new java.lang.String[] {
+              "Changelogs", "NextPageToken",
+            });
+    internal_static_google_cloud_dialogflow_cx_v3beta1_GetChangelogRequest_descriptor =
+        getDescriptor().getMessageTypes().get(2);
+    internal_static_google_cloud_dialogflow_cx_v3beta1_GetChangelogRequest_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_google_cloud_dialogflow_cx_v3beta1_GetChangelogRequest_descriptor,
+            new java.lang.String[] {
+              "Name",
+            });
+    internal_static_google_cloud_dialogflow_cx_v3beta1_Changelog_descriptor =
+        getDescriptor().getMessageTypes().get(3);
+    internal_static_google_cloud_dialogflow_cx_v3beta1_Changelog_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_google_cloud_dialogflow_cx_v3beta1_Changelog_descriptor,
+            new java.lang.String[] {
+              "Name", "UserEmail", "DisplayName", "Action", "Type", "Resource", "CreateTime",
+            });
+    com.google.protobuf.ExtensionRegistry registry =
+        com.google.protobuf.ExtensionRegistry.newInstance();
+    registry.add(com.google.api.ClientProto.defaultHost);
+    registry.add(com.google.api.FieldBehaviorProto.fieldBehavior);
+    registry.add(com.google.api.AnnotationsProto.http);
+    registry.add(com.google.api.ClientProto.methodSignature);
+    registry.add(com.google.api.ClientProto.oauthScopes);
+    registry.add(com.google.api.ResourceProto.resource);
+    registry.add(com.google.api.ResourceProto.resourceReference);
+    com.google.protobuf.Descriptors.FileDescriptor.internalUpdateFileDescriptor(
+        descriptor, registry);
+    com.google.api.AnnotationsProto.getDescriptor();
+    com.google.api.ClientProto.getDescriptor();
+    com.google.api.FieldBehaviorProto.getDescriptor();
+    com.google.api.ResourceProto.getDescriptor();
+    com.google.protobuf.StructProto.getDescriptor();
+    com.google.protobuf.TimestampProto.getDescriptor();
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ContinuousTestResult.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ContinuousTestResult.java
index 3b282666d..58bc45c39 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ContinuousTestResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ContinuousTestResult.java
@@ -533,7 +533,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (result_
@@ -557,7 +557,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (result_
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateAgentRequest.java
index 49e2bf107..c3c3b38d7 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateAgentRequest.java
@@ -250,7 +250,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (agent_ != null) {
@@ -265,7 +265,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (agent_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateEntityTypeRequest.java
index dd0a64487..3c9976d54 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateEntityTypeRequest.java
@@ -324,13 +324,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (entityType_ != null) {
       output.writeMessage(2, getEntityType());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -342,13 +342,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (entityType_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getEntityType());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateEnvironmentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateEnvironmentRequest.java
index 369455755..33e1ec0d0 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateEnvironmentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateEnvironmentRequest.java
@@ -251,7 +251,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (environment_ != null) {
@@ -266,7 +266,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (environment_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateExperimentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateExperimentRequest.java
index 9cb624c62..b84e30e5d 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateExperimentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateExperimentRequest.java
@@ -253,7 +253,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (experiment_ != null) {
@@ -268,7 +268,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (experiment_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateFlowRequest.java
index e464bb5b1..7f2f4f259 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateFlowRequest.java
@@ -323,13 +323,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (flow_ != null) {
       output.writeMessage(2, getFlow());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -341,13 +341,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (flow_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getFlow());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateIntentRequest.java
index f04850eca..4437e020c 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateIntentRequest.java
@@ -319,13 +319,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (intent_ != null) {
       output.writeMessage(2, getIntent());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -337,13 +337,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (intent_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getIntent());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreatePageRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreatePageRequest.java
index beb3199f4..8056a85cf 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreatePageRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreatePageRequest.java
@@ -341,13 +341,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (page_ != null) {
       output.writeMessage(2, getPage());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -359,13 +359,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (page_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getPage());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateSecuritySettingsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateSecuritySettingsRequest.java
index 444aad2e2..d8fcf2f91 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateSecuritySettingsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateSecuritySettingsRequest.java
@@ -252,7 +252,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (securitySettings_ != null) {
@@ -267,7 +267,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (securitySettings_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateSessionEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateSessionEntityTypeRequest.java
index f13208eb0..7f51c4c7d 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateSessionEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateSessionEntityTypeRequest.java
@@ -261,7 +261,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (sessionEntityType_ != null) {
@@ -276,7 +276,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (sessionEntityType_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateTestCaseRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateTestCaseRequest.java
index e6eee1328..d6c297a65 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateTestCaseRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateTestCaseRequest.java
@@ -250,7 +250,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (testCase_ != null) {
@@ -265,7 +265,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (testCase_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateTransitionRouteGroupRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateTransitionRouteGroupRequest.java
index e7c9cecd4..7acbf1c32 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateTransitionRouteGroupRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateTransitionRouteGroupRequest.java
@@ -328,13 +328,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (transitionRouteGroup_ != null) {
       output.writeMessage(2, getTransitionRouteGroup());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -346,14 +346,14 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (transitionRouteGroup_ != null) {
       size +=
           com.google.protobuf.CodedOutputStream.computeMessageSize(2, getTransitionRouteGroup());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateVersionOperationMetadata.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateVersionOperationMetadata.java
index 0afce8f84..9546b360e 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateVersionOperationMetadata.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateVersionOperationMetadata.java
@@ -180,7 +180,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, version_);
     }
     unknownFields.writeTo(output);
@@ -192,7 +192,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, version_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateVersionRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateVersionRequest.java
index 605761c74..fb43dcedb 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateVersionRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateVersionRequest.java
@@ -252,7 +252,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (version_ != null) {
@@ -267,7 +267,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (version_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateWebhookRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateWebhookRequest.java
index 052aca789..d4aa96cb0 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateWebhookRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/CreateWebhookRequest.java
@@ -250,7 +250,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (webhook_ != null) {
@@ -265,7 +265,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (webhook_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteAgentRequest.java
index 24112eae0..7b0372482 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteAgentRequest.java
@@ -180,7 +180,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -192,7 +192,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteEntityTypeRequest.java
index f83ee2965..8d493c310 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteEntityTypeRequest.java
@@ -213,7 +213,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (force_ != false) {
@@ -228,7 +228,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (force_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteEnvironmentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteEnvironmentRequest.java
index e936a786b..cad5f499c 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteEnvironmentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteEnvironmentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteExperimentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteExperimentRequest.java
index 281aebe81..4036c979a 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteExperimentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteExperimentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteFlowRequest.java
index 46ceef762..a002dc31a 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteFlowRequest.java
@@ -213,7 +213,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (force_ != false) {
@@ -228,7 +228,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (force_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteIntentRequest.java
index 4038935b2..4d93f55e3 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteIntentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeletePageRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeletePageRequest.java
index ad2e86800..b5b95ed18 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeletePageRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeletePageRequest.java
@@ -213,7 +213,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (force_ != false) {
@@ -228,7 +228,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (force_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteSecuritySettingsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteSecuritySettingsRequest.java
index c6afdcfce..63704d431 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteSecuritySettingsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteSecuritySettingsRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteSessionEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteSessionEntityTypeRequest.java
index 618cec2e5..84c45600c 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteSessionEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteSessionEntityTypeRequest.java
@@ -191,7 +191,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -203,7 +203,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteTransitionRouteGroupRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteTransitionRouteGroupRequest.java
index 1b988eff3..6d66ce2af 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteTransitionRouteGroupRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteTransitionRouteGroupRequest.java
@@ -211,7 +211,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (force_ != false) {
@@ -226,7 +226,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (force_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteVersionRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteVersionRequest.java
index aad9b50ff..f2b1c2b2c 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteVersionRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteVersionRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteWebhookRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteWebhookRequest.java
index 3b1333469..90062d420 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteWebhookRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeleteWebhookRequest.java
@@ -212,7 +212,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (force_ != false) {
@@ -227,7 +227,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (force_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeployFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeployFlowRequest.java
index d4a3a2434..1dcbd92f2 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeployFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeployFlowRequest.java
@@ -247,10 +247,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, environment_);
     }
-    if (!getFlowVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowVersion_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, flowVersion_);
     }
     unknownFields.writeTo(output);
@@ -262,10 +262,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, environment_);
     }
-    if (!getFlowVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowVersion_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, flowVersion_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeployFlowResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeployFlowResponse.java
index 184570ab8..b18e16de9 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeployFlowResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DeployFlowResponse.java
@@ -246,7 +246,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (environment_ != null) {
       output.writeMessage(1, getEnvironment());
     }
-    if (!getDeploymentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(deployment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, deployment_);
     }
     unknownFields.writeTo(output);
@@ -261,7 +261,7 @@ public int getSerializedSize() {
     if (environment_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, getEnvironment());
     }
-    if (!getDeploymentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(deployment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, deployment_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Deployment.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Deployment.java
index c1502b7e2..1bb51822e 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Deployment.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Deployment.java
@@ -707,7 +707,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
         com.google.protobuf.GeneratedMessageV3.writeString(
             output, 1, deploymentTestResults_.getRaw(i));
       }
-      if (!getExperimentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(experiment_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 2, experiment_);
       }
       unknownFields.writeTo(output);
@@ -727,7 +727,7 @@ public int getSerializedSize() {
         size += dataSize;
         size += 1 * getDeploymentTestResultsList().size();
       }
-      if (!getExperimentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(experiment_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, experiment_);
       }
       size += unknownFields.getSerializedSize();
@@ -1721,10 +1721,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getFlowVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowVersion_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, flowVersion_);
     }
     if (state_
@@ -1749,10 +1749,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getFlowVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowVersion_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, flowVersion_);
     }
     if (state_
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DetectIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DetectIntentRequest.java
index bd285892d..da135d2b5 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DetectIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DetectIntentRequest.java
@@ -406,7 +406,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, session_);
     }
     if (queryParams_ != null) {
@@ -427,7 +427,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, session_);
     }
     if (queryParams_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DetectIntentResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DetectIntentResponse.java
index c84bebdc1..9c7dd701d 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DetectIntentResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DetectIntentResponse.java
@@ -578,7 +578,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(responseId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, responseId_);
     }
     if (queryResult_ != null) {
@@ -608,7 +608,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(responseId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, responseId_);
     }
     if (queryResult_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DtmfInput.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DtmfInput.java
index 5e7609785..f11cf088a 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DtmfInput.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/DtmfInput.java
@@ -231,10 +231,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getDigitsBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(digits_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, digits_);
     }
-    if (!getFinishDigitBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(finishDigit_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, finishDigit_);
     }
     unknownFields.writeTo(output);
@@ -246,10 +246,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getDigitsBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(digits_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, digits_);
     }
-    if (!getFinishDigitBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(finishDigit_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, finishDigit_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EntityType.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EntityType.java
index 92481c340..b2d16e688 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EntityType.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EntityType.java
@@ -908,7 +908,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getValueBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(value_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, value_);
       }
       for (int i = 0; i < synonyms_.size(); i++) {
@@ -923,7 +923,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getValueBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(value_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, value_);
       }
       {
@@ -1836,7 +1836,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getValueBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(value_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, value_);
       }
       unknownFields.writeTo(output);
@@ -1848,7 +1848,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getValueBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(value_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, value_);
       }
       size += unknownFields.getSerializedSize();
@@ -2729,10 +2729,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     if (kind_
@@ -2766,10 +2766,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     if (kind_
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Environment.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Environment.java
index df003acf1..d4ab06455 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Environment.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Environment.java
@@ -384,7 +384,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getVersionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, version_);
       }
       unknownFields.writeTo(output);
@@ -396,7 +396,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getVersionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, version_);
       }
       size += unknownFields.getSerializedSize();
@@ -2287,13 +2287,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, description_);
     }
     if (updateTime_ != null) {
@@ -2314,13 +2314,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, description_);
     }
     if (updateTime_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EventHandler.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EventHandler.java
index 10a660ef5..03e3071de 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EventHandler.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EventHandler.java
@@ -534,13 +534,13 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (targetCase_ == 3) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, target_);
     }
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, event_);
     }
     if (triggerFulfillment_ != null) {
       output.writeMessage(5, getTriggerFulfillment());
     }
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, name_);
     }
     unknownFields.writeTo(output);
@@ -558,13 +558,13 @@ public int getSerializedSize() {
     if (targetCase_ == 3) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, target_);
     }
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, event_);
     }
     if (triggerFulfillment_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(5, getTriggerFulfillment());
     }
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EventInput.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EventInput.java
index c7e450de4..eaaf01708 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EventInput.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/EventInput.java
@@ -174,7 +174,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, event_);
     }
     unknownFields.writeTo(output);
@@ -186,7 +186,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, event_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Experiment.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Experiment.java
index 1cbd9efc4..6e643c7a8 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Experiment.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Experiment.java
@@ -861,7 +861,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getConditionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, condition_);
       }
       if (variantsCase_ == 2) {
@@ -876,7 +876,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getConditionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, condition_);
       }
       if (variantsCase_ == 2) {
@@ -5232,7 +5232,7 @@ public final boolean isInitialized() {
 
       @java.lang.Override
       public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-        if (!getVersionBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 1, version_);
         }
         for (int i = 0; i < metrics_.size(); i++) {
@@ -5250,7 +5250,7 @@ public int getSerializedSize() {
         if (size != -1) return size;
 
         size = 0;
-        if (!getVersionBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, version_);
         }
         for (int i = 0; i < metrics_.size(); i++) {
@@ -8248,13 +8248,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, description_);
     }
     if (state_
@@ -8291,7 +8291,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (rolloutState_ != null) {
       output.writeMessage(15, getRolloutState());
     }
-    if (!getRolloutFailureReasonBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(rolloutFailureReason_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 16, rolloutFailureReason_);
     }
     unknownFields.writeTo(output);
@@ -8303,13 +8303,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, description_);
     }
     if (state_
@@ -8346,7 +8346,7 @@ public int getSerializedSize() {
     if (rolloutState_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(15, getRolloutState());
     }
-    if (!getRolloutFailureReasonBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(rolloutFailureReason_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(16, rolloutFailureReason_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportAgentRequest.java
index 87fa13634..695787d51 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportAgentRequest.java
@@ -308,13 +308,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getAgentUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agentUri_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, agentUri_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, environment_);
     }
     unknownFields.writeTo(output);
@@ -326,13 +326,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getAgentUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(agentUri_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, agentUri_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, environment_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportFlowRequest.java
index 037ae36db..b9c21896f 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportFlowRequest.java
@@ -268,10 +268,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getFlowUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowUri_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, flowUri_);
     }
     if (includeReferencedFlows_ != false) {
@@ -286,10 +286,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getFlowUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flowUri_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, flowUri_);
     }
     if (includeReferencedFlows_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportTestCasesRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportTestCasesRequest.java
index 731660256..c3a25b910 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportTestCasesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ExportTestCasesRequest.java
@@ -589,7 +589,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (destinationCase_ == 2) {
@@ -601,7 +601,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(3, dataFormat_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, filter_);
     }
     unknownFields.writeTo(output);
@@ -613,7 +613,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (destinationCase_ == 2) {
@@ -625,7 +625,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(3, dataFormat_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, filter_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Flow.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Flow.java
index e03d454b9..08db9e4e9 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Flow.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Flow.java
@@ -760,13 +760,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, description_);
     }
     for (int i = 0; i < transitionRoutes_.size(); i++) {
@@ -791,13 +791,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, description_);
     }
     for (int i = 0; i < transitionRoutes_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/FlowValidationResult.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/FlowValidationResult.java
index 049b41145..702111d23 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/FlowValidationResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/FlowValidationResult.java
@@ -335,7 +335,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     for (int i = 0; i < validationMessages_.size(); i++) {
@@ -353,7 +353,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     for (int i = 0; i < validationMessages_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Form.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Form.java
index 5325c7ebe..6191f0557 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Form.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Form.java
@@ -2958,13 +2958,13 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, displayName_);
       }
       if (required_ != false) {
         output.writeBool(2, required_);
       }
-      if (!getEntityTypeBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(entityType_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 3, entityType_);
       }
       if (isList_ != false) {
@@ -2988,13 +2988,13 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, displayName_);
       }
       if (required_ != false) {
         size += com.google.protobuf.CodedOutputStream.computeBoolSize(2, required_);
       }
-      if (!getEntityTypeBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(entityType_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, entityType_);
       }
       if (isList_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/FulfillIntentResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/FulfillIntentResponse.java
index e602ce21f..6761d5a04 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/FulfillIntentResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/FulfillIntentResponse.java
@@ -340,7 +340,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(responseId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, responseId_);
     }
     if (queryResult_ != null) {
@@ -361,7 +361,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(responseId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, responseId_);
     }
     if (queryResult_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Fulfillment.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Fulfillment.java
index 935d8967e..0b54e807a 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Fulfillment.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Fulfillment.java
@@ -469,7 +469,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getParameterBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parameter_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parameter_);
       }
       if (value_ != null) {
@@ -484,7 +484,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getParameterBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parameter_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parameter_);
       }
       if (value_ != null) {
@@ -3079,7 +3079,7 @@ public final boolean isInitialized() {
 
       @java.lang.Override
       public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-        if (!getConditionBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 1, condition_);
         }
         for (int i = 0; i < caseContent_.size(); i++) {
@@ -3094,7 +3094,7 @@ public int getSerializedSize() {
         if (size != -1) return size;
 
         size = 0;
-        if (!getConditionBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, condition_);
         }
         for (int i = 0; i < caseContent_.size(); i++) {
@@ -5417,10 +5417,10 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < messages_.size(); i++) {
       output.writeMessage(1, messages_.get(i));
     }
-    if (!getWebhookBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(webhook_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, webhook_);
     }
-    if (!getTagBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(tag_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, tag_);
     }
     for (int i = 0; i < setParameterActions_.size(); i++) {
@@ -5444,10 +5444,10 @@ public int getSerializedSize() {
     for (int i = 0; i < messages_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, messages_.get(i));
     }
-    if (!getWebhookBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(webhook_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, webhook_);
     }
-    if (!getTagBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(tag_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, tag_);
     }
     for (int i = 0; i < setParameterActions_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetAgentRequest.java
index 222abad8b..be681a5f7 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetAgentRequest.java
@@ -180,7 +180,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -192,7 +192,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetAgentValidationResultRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetAgentValidationResultRequest.java
index 6539648cc..0a53310bc 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetAgentValidationResultRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetAgentValidationResultRequest.java
@@ -240,10 +240,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -255,10 +255,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetChangelogRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetChangelogRequest.java
new file mode 100644
index 000000000..6328e742f
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetChangelogRequest.java
@@ -0,0 +1,665 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3beta1/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+/**
+ *
+ *
+ * <pre>
+ * The request message for [Changelogs.GetChangelog][google.cloud.dialogflow.cx.v3beta1.Changelogs.GetChangelog].
+ * </pre>
+ *
+ * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest}
+ */
+public final class GetChangelogRequest extends com.google.protobuf.GeneratedMessageV3
+    implements
+    // @@protoc_insertion_point(message_implements:google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest)
+    GetChangelogRequestOrBuilder {
+  private static final long serialVersionUID = 0L;
+  // Use GetChangelogRequest.newBuilder() to construct.
+  private GetChangelogRequest(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+    super(builder);
+  }
+
+  private GetChangelogRequest() {
+    name_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+    return new GetChangelogRequest();
+  }
+
+  @java.lang.Override
+  public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+    return this.unknownFields;
+  }
+
+  private GetChangelogRequest(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    this();
+    if (extensionRegistry == null) {
+      throw new java.lang.NullPointerException();
+    }
+    com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+        com.google.protobuf.UnknownFieldSet.newBuilder();
+    try {
+      boolean done = false;
+      while (!done) {
+        int tag = input.readTag();
+        switch (tag) {
+          case 0:
+            done = true;
+            break;
+          case 10:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              name_ = s;
+              break;
+            }
+          default:
+            {
+              if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+        }
+      }
+    } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+      throw e.setUnfinishedMessage(this);
+    } catch (java.io.IOException e) {
+      throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+    } finally {
+      this.unknownFields = unknownFields.build();
+      makeExtensionsImmutable();
+    }
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+    return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3beta1_GetChangelogRequest_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3beta1_GetChangelogRequest_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest.class,
+            com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest.Builder.class);
+  }
+
+  public static final int NAME_FIELD_NUMBER = 1;
+  private volatile java.lang.Object name_;
+  /**
+   *
+   *
+   * <pre>
+   * Required. The name of the changelog to get.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The name.
+   */
+  @java.lang.Override
+  public java.lang.String getName() {
+    java.lang.Object ref = name_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      name_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Required. The name of the changelog to get.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The bytes for name.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getNameBytes() {
+    java.lang.Object ref = name_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      name_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  private byte memoizedIsInitialized = -1;
+
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
+    }
+    unknownFields.writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
+    }
+    size += unknownFields.getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (!(obj instanceof com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest)) {
+      return super.equals(obj);
+    }
+    com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest other =
+        (com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest) obj;
+
+    if (!getName().equals(other.getName())) return false;
+    if (!unknownFields.equals(other.unknownFields)) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    hash = (37 * hash) + NAME_FIELD_NUMBER;
+    hash = (53 * hash) + getName().hashCode();
+    hash = (29 * hash) + unknownFields.hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseFrom(
+      java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseFrom(
+      java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseFrom(
+      byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseDelimitedFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseDelimitedFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseFrom(
+      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() {
+    return newBuilder();
+  }
+
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+
+  public static Builder newBuilder(
+      com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The request message for [Changelogs.GetChangelog][google.cloud.dialogflow.cx.v3beta1.Changelogs.GetChangelog].
+   * </pre>
+   *
+   * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest}
+   */
+  public static final class Builder extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+      implements
+      // @@protoc_insertion_point(builder_implements:google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest)
+      com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequestOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_GetChangelogRequest_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_GetChangelogRequest_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest.class,
+              com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest.Builder.class);
+    }
+
+    // Construct using com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest.newBuilder()
+    private Builder() {
+      maybeForceBuilderInitialization();
+    }
+
+    private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+      maybeForceBuilderInitialization();
+    }
+
+    private void maybeForceBuilderInitialization() {
+      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+    }
+
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      name_ = "";
+
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_GetChangelogRequest_descriptor;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest getDefaultInstanceForType() {
+      return com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest build() {
+      com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest buildPartial() {
+      com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest result =
+          new com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest(this);
+      result.name_ = name_;
+      onBuilt();
+      return result;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.setField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+
+    @java.lang.Override
+    public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest) {
+        return mergeFrom((com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest) other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest other) {
+      if (other == com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest.getDefaultInstance())
+        return this;
+      if (!other.getName().isEmpty()) {
+        name_ = other.name_;
+        onChanged();
+      }
+      this.mergeUnknownFields(other.unknownFields);
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest parsedMessage = null;
+      try {
+        parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        parsedMessage =
+            (com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest) e.getUnfinishedMessage();
+        throw e.unwrapIOException();
+      } finally {
+        if (parsedMessage != null) {
+          mergeFrom(parsedMessage);
+        }
+      }
+      return this;
+    }
+
+    private java.lang.Object name_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * Required. The name of the changelog to get.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return The name.
+     */
+    public java.lang.String getName() {
+      java.lang.Object ref = name_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        name_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The name of the changelog to get.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return The bytes for name.
+     */
+    public com.google.protobuf.ByteString getNameBytes() {
+      java.lang.Object ref = name_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        name_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The name of the changelog to get.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @param value The name to set.
+     * @return This builder for chaining.
+     */
+    public Builder setName(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      name_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The name of the changelog to get.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearName() {
+
+      name_ = getDefaultInstance().getName();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The name of the changelog to get.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+     * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @param value The bytes for name to set.
+     * @return This builder for chaining.
+     */
+    public Builder setNameBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      name_ = value;
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+    // @@protoc_insertion_point(builder_scope:google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest)
+  }
+
+  // @@protoc_insertion_point(class_scope:google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest)
+  private static final com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest DEFAULT_INSTANCE;
+
+  static {
+    DEFAULT_INSTANCE = new com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest();
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser<GetChangelogRequest> PARSER =
+      new com.google.protobuf.AbstractParser<GetChangelogRequest>() {
+        @java.lang.Override
+        public GetChangelogRequest parsePartialFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws com.google.protobuf.InvalidProtocolBufferException {
+          return new GetChangelogRequest(input, extensionRegistry);
+        }
+      };
+
+  public static com.google.protobuf.Parser<GetChangelogRequest> parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser<GetChangelogRequest> getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetChangelogRequestOrBuilder.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetChangelogRequestOrBuilder.java
new file mode 100644
index 000000000..5572a45a1
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetChangelogRequestOrBuilder.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3beta1/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+public interface GetChangelogRequestOrBuilder
+    extends
+    // @@protoc_insertion_point(interface_extends:google.cloud.dialogflow.cx.v3beta1.GetChangelogRequest)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   *
+   *
+   * <pre>
+   * Required. The name of the changelog to get.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The name.
+   */
+  java.lang.String getName();
+  /**
+   *
+   *
+   * <pre>
+   * Required. The name of the changelog to get.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent
+   * ID&gt;/changelogs/&lt;Changelog ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string name = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The bytes for name.
+   */
+  com.google.protobuf.ByteString getNameBytes();
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetDeploymentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetDeploymentRequest.java
index d2e5824e4..32ea8bfc0 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetDeploymentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetDeploymentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetEntityTypeRequest.java
index 6a2ce91f3..6e0b14be7 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetEntityTypeRequest.java
@@ -257,10 +257,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -272,10 +272,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetEnvironmentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetEnvironmentRequest.java
index 891cb9903..5cb20d02f 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetEnvironmentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetEnvironmentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetExperimentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetExperimentRequest.java
index 4f8e2a29e..9729571b6 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetExperimentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetExperimentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetFlowRequest.java
index de14c5695..9cad317d3 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetFlowRequest.java
@@ -259,10 +259,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -274,10 +274,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetFlowValidationResultRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetFlowValidationResultRequest.java
index 02809b62b..2dadfb24f 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetFlowValidationResultRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetFlowValidationResultRequest.java
@@ -240,10 +240,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -255,10 +255,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetIntentRequest.java
index 59f9d721a..948b2f8b8 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetIntentRequest.java
@@ -253,10 +253,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -268,10 +268,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetPageRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetPageRequest.java
index e6debe844..5ca55d8a9 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetPageRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetPageRequest.java
@@ -275,10 +275,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -290,10 +290,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetSecuritySettingsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetSecuritySettingsRequest.java
index d22af576e..19ae1fbb7 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetSecuritySettingsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetSecuritySettingsRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetSessionEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetSessionEntityTypeRequest.java
index 6fd72da3a..4946d7a8b 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetSessionEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetSessionEntityTypeRequest.java
@@ -190,7 +190,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -202,7 +202,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTestCaseRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTestCaseRequest.java
index 3e7c132de..a29f155e1 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTestCaseRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTestCaseRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTestCaseResultRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTestCaseResultRequest.java
index 4513e89ea..9aa597a77 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTestCaseResultRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTestCaseResultRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTransitionRouteGroupRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTransitionRouteGroupRequest.java
index 6ab0d5f2f..77981ec95 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTransitionRouteGroupRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetTransitionRouteGroupRequest.java
@@ -258,10 +258,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -273,10 +273,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetVersionRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetVersionRequest.java
index a7593ad28..33e929f0d 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetVersionRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetVersionRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetWebhookRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetWebhookRequest.java
index fad0e1648..3020f421a 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetWebhookRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/GetWebhookRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportFlowRequest.java
index 3c629b2f3..c17ff5246 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportFlowRequest.java
@@ -567,7 +567,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (flowCase_ == 2) {
@@ -591,7 +591,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (flowCase_ == 2) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportFlowResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportFlowResponse.java
index 5bde55f34..edf6eecc5 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportFlowResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportFlowResponse.java
@@ -178,7 +178,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flow_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, flow_);
     }
     unknownFields.writeTo(output);
@@ -190,7 +190,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flow_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, flow_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportTestCasesRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportTestCasesRequest.java
index 515ac9065..270bd5f2d 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportTestCasesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ImportTestCasesRequest.java
@@ -351,7 +351,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (sourceCase_ == 2) {
@@ -369,7 +369,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (sourceCase_ == 2) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/InputAudioConfig.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/InputAudioConfig.java
index 40c7cb901..d5729394f 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/InputAudioConfig.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/InputAudioConfig.java
@@ -476,7 +476,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < phraseHints_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, phraseHints_.getRaw(i));
     }
-    if (!getModelBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(model_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 7, model_);
     }
     if (singleUtterance_ != false) {
@@ -516,7 +516,7 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getPhraseHintsList().size();
     }
-    if (!getModelBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(model_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, model_);
     }
     if (singleUtterance_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Intent.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Intent.java
index a88d54315..81e9e1c75 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Intent.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Intent.java
@@ -763,10 +763,10 @@ public final boolean isInitialized() {
 
       @java.lang.Override
       public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-        if (!getTextBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(text_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 1, text_);
         }
-        if (!getParameterIdBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parameterId_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 2, parameterId_);
         }
         unknownFields.writeTo(output);
@@ -778,10 +778,10 @@ public int getSerializedSize() {
         if (size != -1) return size;
 
         size = 0;
-        if (!getTextBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(text_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, text_);
         }
-        if (!getParameterIdBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parameterId_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, parameterId_);
         }
         size += unknownFields.getSerializedSize();
@@ -1598,7 +1598,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getIdBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, id_);
       }
       for (int i = 0; i < parts_.size(); i++) {
@@ -1616,7 +1616,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getIdBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, id_);
       }
       for (int i = 0; i < parts_.size(); i++) {
@@ -3208,10 +3208,10 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getIdBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, id_);
       }
-      if (!getEntityTypeBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(entityType_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 2, entityType_);
       }
       if (isList_ != false) {
@@ -3229,10 +3229,10 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getIdBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, id_);
       }
-      if (!getEntityTypeBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(entityType_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, entityType_);
       }
       if (isList_ != false) {
@@ -4502,10 +4502,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     for (int i = 0; i < trainingPhrases_.size(); i++) {
@@ -4522,7 +4522,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     }
     com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
         output, internalGetLabels(), LabelsDefaultEntryHolder.defaultEntry, 7);
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 8, description_);
     }
     unknownFields.writeTo(output);
@@ -4534,10 +4534,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     for (int i = 0; i < trainingPhrases_.size(); i++) {
@@ -4562,7 +4562,7 @@ public int getSerializedSize() {
               .build();
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(7, labels__);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(8, description_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/IntentCoverage.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/IntentCoverage.java
index 8f611bae1..03053bbf3 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/IntentCoverage.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/IntentCoverage.java
@@ -352,7 +352,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getIntentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, intent_);
       }
       if (covered_ != false) {
@@ -367,7 +367,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getIntentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, intent_);
       }
       if (covered_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/IntentInput.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/IntentInput.java
index 143a23eaa..4b80b9b12 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/IntentInput.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/IntentInput.java
@@ -183,7 +183,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getIntentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, intent_);
     }
     unknownFields.writeTo(output);
@@ -195,7 +195,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getIntentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, intent_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListAgentsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListAgentsRequest.java
index 72b151ff7..b4d952fe5 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListAgentsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListAgentsRequest.java
@@ -261,13 +261,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -279,13 +279,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListAgentsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListAgentsResponse.java
index 84837d503..79246429e 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListAgentsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListAgentsResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < agents_.size(); i++) {
       output.writeMessage(1, agents_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < agents_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, agents_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsRequest.java
new file mode 100644
index 000000000..c46fc8976
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsRequest.java
@@ -0,0 +1,1246 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3beta1/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+/**
+ *
+ *
+ * <pre>
+ * The request message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3beta1.Changelogs.ListChangelogs].
+ * </pre>
+ *
+ * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest}
+ */
+public final class ListChangelogsRequest extends com.google.protobuf.GeneratedMessageV3
+    implements
+    // @@protoc_insertion_point(message_implements:google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest)
+    ListChangelogsRequestOrBuilder {
+  private static final long serialVersionUID = 0L;
+  // Use ListChangelogsRequest.newBuilder() to construct.
+  private ListChangelogsRequest(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+    super(builder);
+  }
+
+  private ListChangelogsRequest() {
+    parent_ = "";
+    filter_ = "";
+    pageToken_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+    return new ListChangelogsRequest();
+  }
+
+  @java.lang.Override
+  public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+    return this.unknownFields;
+  }
+
+  private ListChangelogsRequest(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    this();
+    if (extensionRegistry == null) {
+      throw new java.lang.NullPointerException();
+    }
+    com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+        com.google.protobuf.UnknownFieldSet.newBuilder();
+    try {
+      boolean done = false;
+      while (!done) {
+        int tag = input.readTag();
+        switch (tag) {
+          case 0:
+            done = true;
+            break;
+          case 10:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              parent_ = s;
+              break;
+            }
+          case 18:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              filter_ = s;
+              break;
+            }
+          case 24:
+            {
+              pageSize_ = input.readInt32();
+              break;
+            }
+          case 34:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              pageToken_ = s;
+              break;
+            }
+          default:
+            {
+              if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+        }
+      }
+    } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+      throw e.setUnfinishedMessage(this);
+    } catch (java.io.IOException e) {
+      throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+    } finally {
+      this.unknownFields = unknownFields.build();
+      makeExtensionsImmutable();
+    }
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+    return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsRequest_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsRequest_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest.class,
+            com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest.Builder.class);
+  }
+
+  public static final int PARENT_FIELD_NUMBER = 1;
+  private volatile java.lang.Object parent_;
+  /**
+   *
+   *
+   * <pre>
+   * Required. The agent containing the changelogs.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The parent.
+   */
+  @java.lang.Override
+  public java.lang.String getParent() {
+    java.lang.Object ref = parent_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      parent_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Required. The agent containing the changelogs.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The bytes for parent.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getParentBytes() {
+    java.lang.Object ref = parent_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      parent_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int FILTER_FIELD_NUMBER = 2;
+  private volatile java.lang.Object filter_;
+  /**
+   *
+   *
+   * <pre>
+   * The filter string. Supports filter by user_email, resource, type and
+   * create_time. Some examples:
+   *   1. By user email:
+   *        user_email = "someone&#64;google.com"
+   *   2. By resource name:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *   3. By resource display name:
+   *        display_name = "my agent"
+   *   4. By action:
+   *        action = "Create"
+   *   5. By type:
+   *        type = "flows"
+   *   6. By create time. Currently predicates on `create_time` and
+   *      `create_time_epoch_seconds` are supported:
+   *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+   *        2017-01-15T01:30:15.01Z
+   *   7. Combination of above filters:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *          AND user_email = "someone&#64;google.com"
+   *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+   * </pre>
+   *
+   * <code>string filter = 2;</code>
+   *
+   * @return The filter.
+   */
+  @java.lang.Override
+  public java.lang.String getFilter() {
+    java.lang.Object ref = filter_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      filter_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The filter string. Supports filter by user_email, resource, type and
+   * create_time. Some examples:
+   *   1. By user email:
+   *        user_email = "someone&#64;google.com"
+   *   2. By resource name:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *   3. By resource display name:
+   *        display_name = "my agent"
+   *   4. By action:
+   *        action = "Create"
+   *   5. By type:
+   *        type = "flows"
+   *   6. By create time. Currently predicates on `create_time` and
+   *      `create_time_epoch_seconds` are supported:
+   *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+   *        2017-01-15T01:30:15.01Z
+   *   7. Combination of above filters:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *          AND user_email = "someone&#64;google.com"
+   *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+   * </pre>
+   *
+   * <code>string filter = 2;</code>
+   *
+   * @return The bytes for filter.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getFilterBytes() {
+    java.lang.Object ref = filter_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      filter_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int PAGE_SIZE_FIELD_NUMBER = 3;
+  private int pageSize_;
+  /**
+   *
+   *
+   * <pre>
+   * The maximum number of items to return in a single page. By default 100 and
+   * at most 1000.
+   * </pre>
+   *
+   * <code>int32 page_size = 3;</code>
+   *
+   * @return The pageSize.
+   */
+  @java.lang.Override
+  public int getPageSize() {
+    return pageSize_;
+  }
+
+  public static final int PAGE_TOKEN_FIELD_NUMBER = 4;
+  private volatile java.lang.Object pageToken_;
+  /**
+   *
+   *
+   * <pre>
+   * The next_page_token value returned from a previous list request.
+   * </pre>
+   *
+   * <code>string page_token = 4;</code>
+   *
+   * @return The pageToken.
+   */
+  @java.lang.Override
+  public java.lang.String getPageToken() {
+    java.lang.Object ref = pageToken_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      pageToken_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The next_page_token value returned from a previous list request.
+   * </pre>
+   *
+   * <code>string page_token = 4;</code>
+   *
+   * @return The bytes for pageToken.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getPageTokenBytes() {
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+      com.google.protobuf.ByteString b =
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+  }
+
+  private byte memoizedIsInitialized = -1;
+
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
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+    if (pageSize_ != 0) {
+      output.writeInt32(3, pageSize_);
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 4, pageToken_);
+    }
+    unknownFields.writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, filter_);
+    }
+    if (pageSize_ != 0) {
+      size += com.google.protobuf.CodedOutputStream.computeInt32Size(3, pageSize_);
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+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, pageToken_);
+    }
+    size += unknownFields.getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (!(obj instanceof com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest)) {
+      return super.equals(obj);
+    }
+    com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest other =
+        (com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest) obj;
+
+    if (!getParent().equals(other.getParent())) return false;
+    if (!getFilter().equals(other.getFilter())) return false;
+    if (getPageSize() != other.getPageSize()) return false;
+    if (!getPageToken().equals(other.getPageToken())) return false;
+    if (!unknownFields.equals(other.unknownFields)) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    hash = (37 * hash) + PARENT_FIELD_NUMBER;
+    hash = (53 * hash) + getParent().hashCode();
+    hash = (37 * hash) + FILTER_FIELD_NUMBER;
+    hash = (53 * hash) + getFilter().hashCode();
+    hash = (37 * hash) + PAGE_SIZE_FIELD_NUMBER;
+    hash = (53 * hash) + getPageSize();
+    hash = (37 * hash) + PAGE_TOKEN_FIELD_NUMBER;
+    hash = (53 * hash) + getPageToken().hashCode();
+    hash = (29 * hash) + unknownFields.hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseFrom(
+      java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseFrom(
+      java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseFrom(
+      byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseDelimitedFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseDelimitedFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseFrom(
+      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() {
+    return newBuilder();
+  }
+
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+
+  public static Builder newBuilder(
+      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The request message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3beta1.Changelogs.ListChangelogs].
+   * </pre>
+   *
+   * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest}
+   */
+  public static final class Builder extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+      implements
+      // @@protoc_insertion_point(builder_implements:google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest)
+      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequestOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsRequest_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsRequest_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest.class,
+              com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest.Builder.class);
+    }
+
+    // Construct using com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest.newBuilder()
+    private Builder() {
+      maybeForceBuilderInitialization();
+    }
+
+    private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+      maybeForceBuilderInitialization();
+    }
+
+    private void maybeForceBuilderInitialization() {
+      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {}
+    }
+
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      parent_ = "";
+
+      filter_ = "";
+
+      pageSize_ = 0;
+
+      pageToken_ = "";
+
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsRequest_descriptor;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest
+        getDefaultInstanceForType() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest build() {
+      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest buildPartial() {
+      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest result =
+          new com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest(this);
+      result.parent_ = parent_;
+      result.filter_ = filter_;
+      result.pageSize_ = pageSize_;
+      result.pageToken_ = pageToken_;
+      onBuilt();
+      return result;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.setField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+
+    @java.lang.Override
+    public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest) {
+        return mergeFrom((com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest) other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest other) {
+      if (other
+          == com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest.getDefaultInstance())
+        return this;
+      if (!other.getParent().isEmpty()) {
+        parent_ = other.parent_;
+        onChanged();
+      }
+      if (!other.getFilter().isEmpty()) {
+        filter_ = other.filter_;
+        onChanged();
+      }
+      if (other.getPageSize() != 0) {
+        setPageSize(other.getPageSize());
+      }
+      if (!other.getPageToken().isEmpty()) {
+        pageToken_ = other.pageToken_;
+        onChanged();
+      }
+      this.mergeUnknownFields(other.unknownFields);
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest parsedMessage = null;
+      try {
+        parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        parsedMessage =
+            (com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest) e.getUnfinishedMessage();
+        throw e.unwrapIOException();
+      } finally {
+        if (parsedMessage != null) {
+          mergeFrom(parsedMessage);
+        }
+      }
+      return this;
+    }
+
+    private java.lang.Object parent_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * Required. The agent containing the changelogs.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return The parent.
+     */
+    public java.lang.String getParent() {
+      java.lang.Object ref = parent_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        parent_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The agent containing the changelogs.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return The bytes for parent.
+     */
+    public com.google.protobuf.ByteString getParentBytes() {
+      java.lang.Object ref = parent_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        parent_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The agent containing the changelogs.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @param value The parent to set.
+     * @return This builder for chaining.
+     */
+    public Builder setParent(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      parent_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The agent containing the changelogs.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearParent() {
+
+      parent_ = getDefaultInstance().getParent();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Required. The agent containing the changelogs.
+     * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+     * </pre>
+     *
+     * <code>
+     * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+     * </code>
+     *
+     * @param value The bytes for parent to set.
+     * @return This builder for chaining.
+     */
+    public Builder setParentBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      parent_ = value;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object filter_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The filter string. Supports filter by user_email, resource, type and
+     * create_time. Some examples:
+     *   1. By user email:
+     *        user_email = "someone&#64;google.com"
+     *   2. By resource name:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *   3. By resource display name:
+     *        display_name = "my agent"
+     *   4. By action:
+     *        action = "Create"
+     *   5. By type:
+     *        type = "flows"
+     *   6. By create time. Currently predicates on `create_time` and
+     *      `create_time_epoch_seconds` are supported:
+     *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+     *        2017-01-15T01:30:15.01Z
+     *   7. Combination of above filters:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *          AND user_email = "someone&#64;google.com"
+     *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+     * </pre>
+     *
+     * <code>string filter = 2;</code>
+     *
+     * @return The filter.
+     */
+    public java.lang.String getFilter() {
+      java.lang.Object ref = filter_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        filter_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The filter string. Supports filter by user_email, resource, type and
+     * create_time. Some examples:
+     *   1. By user email:
+     *        user_email = "someone&#64;google.com"
+     *   2. By resource name:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *   3. By resource display name:
+     *        display_name = "my agent"
+     *   4. By action:
+     *        action = "Create"
+     *   5. By type:
+     *        type = "flows"
+     *   6. By create time. Currently predicates on `create_time` and
+     *      `create_time_epoch_seconds` are supported:
+     *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+     *        2017-01-15T01:30:15.01Z
+     *   7. Combination of above filters:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *          AND user_email = "someone&#64;google.com"
+     *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+     * </pre>
+     *
+     * <code>string filter = 2;</code>
+     *
+     * @return The bytes for filter.
+     */
+    public com.google.protobuf.ByteString getFilterBytes() {
+      java.lang.Object ref = filter_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        filter_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The filter string. Supports filter by user_email, resource, type and
+     * create_time. Some examples:
+     *   1. By user email:
+     *        user_email = "someone&#64;google.com"
+     *   2. By resource name:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *   3. By resource display name:
+     *        display_name = "my agent"
+     *   4. By action:
+     *        action = "Create"
+     *   5. By type:
+     *        type = "flows"
+     *   6. By create time. Currently predicates on `create_time` and
+     *      `create_time_epoch_seconds` are supported:
+     *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+     *        2017-01-15T01:30:15.01Z
+     *   7. Combination of above filters:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *          AND user_email = "someone&#64;google.com"
+     *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+     * </pre>
+     *
+     * <code>string filter = 2;</code>
+     *
+     * @param value The filter to set.
+     * @return This builder for chaining.
+     */
+    public Builder setFilter(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      filter_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The filter string. Supports filter by user_email, resource, type and
+     * create_time. Some examples:
+     *   1. By user email:
+     *        user_email = "someone&#64;google.com"
+     *   2. By resource name:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *   3. By resource display name:
+     *        display_name = "my agent"
+     *   4. By action:
+     *        action = "Create"
+     *   5. By type:
+     *        type = "flows"
+     *   6. By create time. Currently predicates on `create_time` and
+     *      `create_time_epoch_seconds` are supported:
+     *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+     *        2017-01-15T01:30:15.01Z
+     *   7. Combination of above filters:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *          AND user_email = "someone&#64;google.com"
+     *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+     * </pre>
+     *
+     * <code>string filter = 2;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearFilter() {
+
+      filter_ = getDefaultInstance().getFilter();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The filter string. Supports filter by user_email, resource, type and
+     * create_time. Some examples:
+     *   1. By user email:
+     *        user_email = "someone&#64;google.com"
+     *   2. By resource name:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *   3. By resource display name:
+     *        display_name = "my agent"
+     *   4. By action:
+     *        action = "Create"
+     *   5. By type:
+     *        type = "flows"
+     *   6. By create time. Currently predicates on `create_time` and
+     *      `create_time_epoch_seconds` are supported:
+     *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+     *        2017-01-15T01:30:15.01Z
+     *   7. Combination of above filters:
+     *        resource = "projects/123/locations/global/agents/456/flows/789"
+     *          AND user_email = "someone&#64;google.com"
+     *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+     * </pre>
+     *
+     * <code>string filter = 2;</code>
+     *
+     * @param value The bytes for filter to set.
+     * @return This builder for chaining.
+     */
+    public Builder setFilterBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      filter_ = value;
+      onChanged();
+      return this;
+    }
+
+    private int pageSize_;
+    /**
+     *
+     *
+     * <pre>
+     * The maximum number of items to return in a single page. By default 100 and
+     * at most 1000.
+     * </pre>
+     *
+     * <code>int32 page_size = 3;</code>
+     *
+     * @return The pageSize.
+     */
+    @java.lang.Override
+    public int getPageSize() {
+      return pageSize_;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The maximum number of items to return in a single page. By default 100 and
+     * at most 1000.
+     * </pre>
+     *
+     * <code>int32 page_size = 3;</code>
+     *
+     * @param value The pageSize to set.
+     * @return This builder for chaining.
+     */
+    public Builder setPageSize(int value) {
+
+      pageSize_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The maximum number of items to return in a single page. By default 100 and
+     * at most 1000.
+     * </pre>
+     *
+     * <code>int32 page_size = 3;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearPageSize() {
+
+      pageSize_ = 0;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object pageToken_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * The next_page_token value returned from a previous list request.
+     * </pre>
+     *
+     * <code>string page_token = 4;</code>
+     *
+     * @return The pageToken.
+     */
+    public java.lang.String getPageToken() {
+      java.lang.Object ref = pageToken_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        pageToken_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The next_page_token value returned from a previous list request.
+     * </pre>
+     *
+     * <code>string page_token = 4;</code>
+     *
+     * @return The bytes for pageToken.
+     */
+    public com.google.protobuf.ByteString getPageTokenBytes() {
+      java.lang.Object ref = pageToken_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        pageToken_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The next_page_token value returned from a previous list request.
+     * </pre>
+     *
+     * <code>string page_token = 4;</code>
+     *
+     * @param value The pageToken to set.
+     * @return This builder for chaining.
+     */
+    public Builder setPageToken(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      pageToken_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The next_page_token value returned from a previous list request.
+     * </pre>
+     *
+     * <code>string page_token = 4;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearPageToken() {
+
+      pageToken_ = getDefaultInstance().getPageToken();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The next_page_token value returned from a previous list request.
+     * </pre>
+     *
+     * <code>string page_token = 4;</code>
+     *
+     * @param value The bytes for pageToken to set.
+     * @return This builder for chaining.
+     */
+    public Builder setPageTokenBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      pageToken_ = value;
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+    // @@protoc_insertion_point(builder_scope:google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest)
+  }
+
+  // @@protoc_insertion_point(class_scope:google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest)
+  private static final com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest
+      DEFAULT_INSTANCE;
+
+  static {
+    DEFAULT_INSTANCE = new com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest();
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser<ListChangelogsRequest> PARSER =
+      new com.google.protobuf.AbstractParser<ListChangelogsRequest>() {
+        @java.lang.Override
+        public ListChangelogsRequest parsePartialFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws com.google.protobuf.InvalidProtocolBufferException {
+          return new ListChangelogsRequest(input, extensionRegistry);
+        }
+      };
+
+  public static com.google.protobuf.Parser<ListChangelogsRequest> parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser<ListChangelogsRequest> getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsRequestOrBuilder.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsRequestOrBuilder.java
new file mode 100644
index 000000000..6f0b62cfe
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsRequestOrBuilder.java
@@ -0,0 +1,158 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3beta1/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+public interface ListChangelogsRequestOrBuilder
+    extends
+    // @@protoc_insertion_point(interface_extends:google.cloud.dialogflow.cx.v3beta1.ListChangelogsRequest)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   *
+   *
+   * <pre>
+   * Required. The agent containing the changelogs.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The parent.
+   */
+  java.lang.String getParent();
+  /**
+   *
+   *
+   * <pre>
+   * Required. The agent containing the changelogs.
+   * Format: `projects/&lt;Project ID&gt;/locations/&lt;Location ID&gt;/agents/&lt;Agent ID&gt;`.
+   * </pre>
+   *
+   * <code>
+   * string parent = 1 [(.google.api.field_behavior) = REQUIRED, (.google.api.resource_reference) = { ... }
+   * </code>
+   *
+   * @return The bytes for parent.
+   */
+  com.google.protobuf.ByteString getParentBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The filter string. Supports filter by user_email, resource, type and
+   * create_time. Some examples:
+   *   1. By user email:
+   *        user_email = "someone&#64;google.com"
+   *   2. By resource name:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *   3. By resource display name:
+   *        display_name = "my agent"
+   *   4. By action:
+   *        action = "Create"
+   *   5. By type:
+   *        type = "flows"
+   *   6. By create time. Currently predicates on `create_time` and
+   *      `create_time_epoch_seconds` are supported:
+   *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+   *        2017-01-15T01:30:15.01Z
+   *   7. Combination of above filters:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *          AND user_email = "someone&#64;google.com"
+   *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+   * </pre>
+   *
+   * <code>string filter = 2;</code>
+   *
+   * @return The filter.
+   */
+  java.lang.String getFilter();
+  /**
+   *
+   *
+   * <pre>
+   * The filter string. Supports filter by user_email, resource, type and
+   * create_time. Some examples:
+   *   1. By user email:
+   *        user_email = "someone&#64;google.com"
+   *   2. By resource name:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *   3. By resource display name:
+   *        display_name = "my agent"
+   *   4. By action:
+   *        action = "Create"
+   *   5. By type:
+   *        type = "flows"
+   *   6. By create time. Currently predicates on `create_time` and
+   *      `create_time_epoch_seconds` are supported:
+   *        create_time_epoch_seconds &gt; 1551790877 AND create_time &lt;=
+   *        2017-01-15T01:30:15.01Z
+   *   7. Combination of above filters:
+   *        resource = "projects/123/locations/global/agents/456/flows/789"
+   *          AND user_email = "someone&#64;google.com"
+   *          AND create_time &lt;= 2017-01-15T01:30:15.01Z
+   * </pre>
+   *
+   * <code>string filter = 2;</code>
+   *
+   * @return The bytes for filter.
+   */
+  com.google.protobuf.ByteString getFilterBytes();
+
+  /**
+   *
+   *
+   * <pre>
+   * The maximum number of items to return in a single page. By default 100 and
+   * at most 1000.
+   * </pre>
+   *
+   * <code>int32 page_size = 3;</code>
+   *
+   * @return The pageSize.
+   */
+  int getPageSize();
+
+  /**
+   *
+   *
+   * <pre>
+   * The next_page_token value returned from a previous list request.
+   * </pre>
+   *
+   * <code>string page_token = 4;</code>
+   *
+   * @return The pageToken.
+   */
+  java.lang.String getPageToken();
+  /**
+   *
+   *
+   * <pre>
+   * The next_page_token value returned from a previous list request.
+   * </pre>
+   *
+   * <code>string page_token = 4;</code>
+   *
+   * @return The bytes for pageToken.
+   */
+  com.google.protobuf.ByteString getPageTokenBytes();
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsResponse.java
new file mode 100644
index 000000000..46e3e57e6
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsResponse.java
@@ -0,0 +1,1196 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3beta1/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+/**
+ *
+ *
+ * <pre>
+ * The response message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3beta1.Changelogs.ListChangelogs].
+ * </pre>
+ *
+ * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse}
+ */
+public final class ListChangelogsResponse extends com.google.protobuf.GeneratedMessageV3
+    implements
+    // @@protoc_insertion_point(message_implements:google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse)
+    ListChangelogsResponseOrBuilder {
+  private static final long serialVersionUID = 0L;
+  // Use ListChangelogsResponse.newBuilder() to construct.
+  private ListChangelogsResponse(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+    super(builder);
+  }
+
+  private ListChangelogsResponse() {
+    changelogs_ = java.util.Collections.emptyList();
+    nextPageToken_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
+    return new ListChangelogsResponse();
+  }
+
+  @java.lang.Override
+  public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
+    return this.unknownFields;
+  }
+
+  private ListChangelogsResponse(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    this();
+    if (extensionRegistry == null) {
+      throw new java.lang.NullPointerException();
+    }
+    int mutable_bitField0_ = 0;
+    com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+        com.google.protobuf.UnknownFieldSet.newBuilder();
+    try {
+      boolean done = false;
+      while (!done) {
+        int tag = input.readTag();
+        switch (tag) {
+          case 0:
+            done = true;
+            break;
+          case 10:
+            {
+              if (!((mutable_bitField0_ & 0x00000001) != 0)) {
+                changelogs_ =
+                    new java.util.ArrayList<com.google.cloud.dialogflow.cx.v3beta1.Changelog>();
+                mutable_bitField0_ |= 0x00000001;
+              }
+              changelogs_.add(
+                  input.readMessage(
+                      com.google.cloud.dialogflow.cx.v3beta1.Changelog.parser(),
+                      extensionRegistry));
+              break;
+            }
+          case 18:
+            {
+              java.lang.String s = input.readStringRequireUtf8();
+
+              nextPageToken_ = s;
+              break;
+            }
+          default:
+            {
+              if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+        }
+      }
+    } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+      throw e.setUnfinishedMessage(this);
+    } catch (java.io.IOException e) {
+      throw new com.google.protobuf.InvalidProtocolBufferException(e).setUnfinishedMessage(this);
+    } finally {
+      if (((mutable_bitField0_ & 0x00000001) != 0)) {
+        changelogs_ = java.util.Collections.unmodifiableList(changelogs_);
+      }
+      this.unknownFields = unknownFields.build();
+      makeExtensionsImmutable();
+    }
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+    return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsResponse_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+        .internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsResponse_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse.class,
+            com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse.Builder.class);
+  }
+
+  public static final int CHANGELOGS_FIELD_NUMBER = 1;
+  private java.util.List<com.google.cloud.dialogflow.cx.v3beta1.Changelog> changelogs_;
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+   */
+  @java.lang.Override
+  public java.util.List<com.google.cloud.dialogflow.cx.v3beta1.Changelog> getChangelogsList() {
+    return changelogs_;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+   */
+  @java.lang.Override
+  public java.util.List<? extends com.google.cloud.dialogflow.cx.v3beta1.ChangelogOrBuilder>
+      getChangelogsOrBuilderList() {
+    return changelogs_;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+   */
+  @java.lang.Override
+  public int getChangelogsCount() {
+    return changelogs_.size();
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+   */
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3beta1.Changelog getChangelogs(int index) {
+    return changelogs_.get(index);
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+   */
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3beta1.ChangelogOrBuilder getChangelogsOrBuilder(
+      int index) {
+    return changelogs_.get(index);
+  }
+
+  public static final int NEXT_PAGE_TOKEN_FIELD_NUMBER = 2;
+  private volatile java.lang.Object nextPageToken_;
+  /**
+   *
+   *
+   * <pre>
+   * Token to retrieve the next page of results, or empty if there are no more
+   * results in the list.
+   * </pre>
+   *
+   * <code>string next_page_token = 2;</code>
+   *
+   * @return The nextPageToken.
+   */
+  @java.lang.Override
+  public java.lang.String getNextPageToken() {
+    java.lang.Object ref = nextPageToken_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      nextPageToken_ = s;
+      return s;
+    }
+  }
+  /**
+   *
+   *
+   * <pre>
+   * Token to retrieve the next page of results, or empty if there are no more
+   * results in the list.
+   * </pre>
+   *
+   * <code>string next_page_token = 2;</code>
+   *
+   * @return The bytes for nextPageToken.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString getNextPageTokenBytes() {
+    java.lang.Object ref = nextPageToken_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b =
+          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+      nextPageToken_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  private byte memoizedIsInitialized = -1;
+
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
+    for (int i = 0; i < changelogs_.size(); i++) {
+      output.writeMessage(1, changelogs_.get(i));
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
+    }
+    unknownFields.writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    for (int i = 0; i < changelogs_.size(); i++) {
+      size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, changelogs_.get(i));
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
+    }
+    size += unknownFields.getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (!(obj instanceof com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse)) {
+      return super.equals(obj);
+    }
+    com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse other =
+        (com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse) obj;
+
+    if (!getChangelogsList().equals(other.getChangelogsList())) return false;
+    if (!getNextPageToken().equals(other.getNextPageToken())) return false;
+    if (!unknownFields.equals(other.unknownFields)) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    if (getChangelogsCount() > 0) {
+      hash = (37 * hash) + CHANGELOGS_FIELD_NUMBER;
+      hash = (53 * hash) + getChangelogsList().hashCode();
+    }
+    hash = (37 * hash) + NEXT_PAGE_TOKEN_FIELD_NUMBER;
+    hash = (53 * hash) + getNextPageToken().hashCode();
+    hash = (29 * hash) + unknownFields.hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseFrom(
+      java.nio.ByteBuffer data) throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseFrom(
+      java.nio.ByteBuffer data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseFrom(
+      byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseDelimitedFrom(
+      java.io.InputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseDelimitedFrom(
+      java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseFrom(
+      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+        PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() {
+    return newBuilder();
+  }
+
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+
+  public static Builder newBuilder(
+      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The response message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3beta1.Changelogs.ListChangelogs].
+   * </pre>
+   *
+   * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse}
+   */
+  public static final class Builder extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+      implements
+      // @@protoc_insertion_point(builder_implements:google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse)
+      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponseOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsResponse_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsResponse_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse.class,
+              com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse.Builder.class);
+    }
+
+    // Construct using com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse.newBuilder()
+    private Builder() {
+      maybeForceBuilderInitialization();
+    }
+
+    private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+      maybeForceBuilderInitialization();
+    }
+
+    private void maybeForceBuilderInitialization() {
+      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
+        getChangelogsFieldBuilder();
+      }
+    }
+
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      if (changelogsBuilder_ == null) {
+        changelogs_ = java.util.Collections.emptyList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+      } else {
+        changelogsBuilder_.clear();
+      }
+      nextPageToken_ = "";
+
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ChangelogProto
+          .internal_static_google_cloud_dialogflow_cx_v3beta1_ListChangelogsResponse_descriptor;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse
+        getDefaultInstanceForType() {
+      return com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse build() {
+      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse buildPartial() {
+      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse result =
+          new com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse(this);
+      int from_bitField0_ = bitField0_;
+      if (changelogsBuilder_ == null) {
+        if (((bitField0_ & 0x00000001) != 0)) {
+          changelogs_ = java.util.Collections.unmodifiableList(changelogs_);
+          bitField0_ = (bitField0_ & ~0x00000001);
+        }
+        result.changelogs_ = changelogs_;
+      } else {
+        result.changelogs_ = changelogsBuilder_.build();
+      }
+      result.nextPageToken_ = nextPageToken_;
+      onBuilt();
+      return result;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.setField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+
+    @java.lang.Override
+    public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse) {
+        return mergeFrom((com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse) other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse other) {
+      if (other
+          == com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse.getDefaultInstance())
+        return this;
+      if (changelogsBuilder_ == null) {
+        if (!other.changelogs_.isEmpty()) {
+          if (changelogs_.isEmpty()) {
+            changelogs_ = other.changelogs_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+          } else {
+            ensureChangelogsIsMutable();
+            changelogs_.addAll(other.changelogs_);
+          }
+          onChanged();
+        }
+      } else {
+        if (!other.changelogs_.isEmpty()) {
+          if (changelogsBuilder_.isEmpty()) {
+            changelogsBuilder_.dispose();
+            changelogsBuilder_ = null;
+            changelogs_ = other.changelogs_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+            changelogsBuilder_ =
+                com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders
+                    ? getChangelogsFieldBuilder()
+                    : null;
+          } else {
+            changelogsBuilder_.addAllMessages(other.changelogs_);
+          }
+        }
+      }
+      if (!other.getNextPageToken().isEmpty()) {
+        nextPageToken_ = other.nextPageToken_;
+        onChanged();
+      }
+      this.mergeUnknownFields(other.unknownFields);
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse parsedMessage = null;
+      try {
+        parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        parsedMessage =
+            (com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse)
+                e.getUnfinishedMessage();
+        throw e.unwrapIOException();
+      } finally {
+        if (parsedMessage != null) {
+          mergeFrom(parsedMessage);
+        }
+      }
+      return this;
+    }
+
+    private int bitField0_;
+
+    private java.util.List<com.google.cloud.dialogflow.cx.v3beta1.Changelog> changelogs_ =
+        java.util.Collections.emptyList();
+
+    private void ensureChangelogsIsMutable() {
+      if (!((bitField0_ & 0x00000001) != 0)) {
+        changelogs_ =
+            new java.util.ArrayList<com.google.cloud.dialogflow.cx.v3beta1.Changelog>(changelogs_);
+        bitField0_ |= 0x00000001;
+      }
+    }
+
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+            com.google.cloud.dialogflow.cx.v3beta1.Changelog,
+            com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder,
+            com.google.cloud.dialogflow.cx.v3beta1.ChangelogOrBuilder>
+        changelogsBuilder_;
+
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public java.util.List<com.google.cloud.dialogflow.cx.v3beta1.Changelog> getChangelogsList() {
+      if (changelogsBuilder_ == null) {
+        return java.util.Collections.unmodifiableList(changelogs_);
+      } else {
+        return changelogsBuilder_.getMessageList();
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public int getChangelogsCount() {
+      if (changelogsBuilder_ == null) {
+        return changelogs_.size();
+      } else {
+        return changelogsBuilder_.getCount();
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public com.google.cloud.dialogflow.cx.v3beta1.Changelog getChangelogs(int index) {
+      if (changelogsBuilder_ == null) {
+        return changelogs_.get(index);
+      } else {
+        return changelogsBuilder_.getMessage(index);
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public Builder setChangelogs(
+        int index, com.google.cloud.dialogflow.cx.v3beta1.Changelog value) {
+      if (changelogsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureChangelogsIsMutable();
+        changelogs_.set(index, value);
+        onChanged();
+      } else {
+        changelogsBuilder_.setMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public Builder setChangelogs(
+        int index, com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder builderForValue) {
+      if (changelogsBuilder_ == null) {
+        ensureChangelogsIsMutable();
+        changelogs_.set(index, builderForValue.build());
+        onChanged();
+      } else {
+        changelogsBuilder_.setMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public Builder addChangelogs(com.google.cloud.dialogflow.cx.v3beta1.Changelog value) {
+      if (changelogsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureChangelogsIsMutable();
+        changelogs_.add(value);
+        onChanged();
+      } else {
+        changelogsBuilder_.addMessage(value);
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public Builder addChangelogs(
+        int index, com.google.cloud.dialogflow.cx.v3beta1.Changelog value) {
+      if (changelogsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureChangelogsIsMutable();
+        changelogs_.add(index, value);
+        onChanged();
+      } else {
+        changelogsBuilder_.addMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public Builder addChangelogs(
+        com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder builderForValue) {
+      if (changelogsBuilder_ == null) {
+        ensureChangelogsIsMutable();
+        changelogs_.add(builderForValue.build());
+        onChanged();
+      } else {
+        changelogsBuilder_.addMessage(builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public Builder addChangelogs(
+        int index, com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder builderForValue) {
+      if (changelogsBuilder_ == null) {
+        ensureChangelogsIsMutable();
+        changelogs_.add(index, builderForValue.build());
+        onChanged();
+      } else {
+        changelogsBuilder_.addMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public Builder addAllChangelogs(
+        java.lang.Iterable<? extends com.google.cloud.dialogflow.cx.v3beta1.Changelog> values) {
+      if (changelogsBuilder_ == null) {
+        ensureChangelogsIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(values, changelogs_);
+        onChanged();
+      } else {
+        changelogsBuilder_.addAllMessages(values);
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public Builder clearChangelogs() {
+      if (changelogsBuilder_ == null) {
+        changelogs_ = java.util.Collections.emptyList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+      } else {
+        changelogsBuilder_.clear();
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public Builder removeChangelogs(int index) {
+      if (changelogsBuilder_ == null) {
+        ensureChangelogsIsMutable();
+        changelogs_.remove(index);
+        onChanged();
+      } else {
+        changelogsBuilder_.remove(index);
+      }
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder getChangelogsBuilder(
+        int index) {
+      return getChangelogsFieldBuilder().getBuilder(index);
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public com.google.cloud.dialogflow.cx.v3beta1.ChangelogOrBuilder getChangelogsOrBuilder(
+        int index) {
+      if (changelogsBuilder_ == null) {
+        return changelogs_.get(index);
+      } else {
+        return changelogsBuilder_.getMessageOrBuilder(index);
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public java.util.List<? extends com.google.cloud.dialogflow.cx.v3beta1.ChangelogOrBuilder>
+        getChangelogsOrBuilderList() {
+      if (changelogsBuilder_ != null) {
+        return changelogsBuilder_.getMessageOrBuilderList();
+      } else {
+        return java.util.Collections.unmodifiableList(changelogs_);
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder addChangelogsBuilder() {
+      return getChangelogsFieldBuilder()
+          .addBuilder(com.google.cloud.dialogflow.cx.v3beta1.Changelog.getDefaultInstance());
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder addChangelogsBuilder(
+        int index) {
+      return getChangelogsFieldBuilder()
+          .addBuilder(index, com.google.cloud.dialogflow.cx.v3beta1.Changelog.getDefaultInstance());
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The list of changelogs. There will be a maximum number of items returned
+     * based on the page_size field in the request. The changelogs will be ordered
+     * by timestamp.
+     * </pre>
+     *
+     * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+     */
+    public java.util.List<com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder>
+        getChangelogsBuilderList() {
+      return getChangelogsFieldBuilder().getBuilderList();
+    }
+
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+            com.google.cloud.dialogflow.cx.v3beta1.Changelog,
+            com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder,
+            com.google.cloud.dialogflow.cx.v3beta1.ChangelogOrBuilder>
+        getChangelogsFieldBuilder() {
+      if (changelogsBuilder_ == null) {
+        changelogsBuilder_ =
+            new com.google.protobuf.RepeatedFieldBuilderV3<
+                com.google.cloud.dialogflow.cx.v3beta1.Changelog,
+                com.google.cloud.dialogflow.cx.v3beta1.Changelog.Builder,
+                com.google.cloud.dialogflow.cx.v3beta1.ChangelogOrBuilder>(
+                changelogs_, ((bitField0_ & 0x00000001) != 0), getParentForChildren(), isClean());
+        changelogs_ = null;
+      }
+      return changelogsBuilder_;
+    }
+
+    private java.lang.Object nextPageToken_ = "";
+    /**
+     *
+     *
+     * <pre>
+     * Token to retrieve the next page of results, or empty if there are no more
+     * results in the list.
+     * </pre>
+     *
+     * <code>string next_page_token = 2;</code>
+     *
+     * @return The nextPageToken.
+     */
+    public java.lang.String getNextPageToken() {
+      java.lang.Object ref = nextPageToken_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        nextPageToken_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Token to retrieve the next page of results, or empty if there are no more
+     * results in the list.
+     * </pre>
+     *
+     * <code>string next_page_token = 2;</code>
+     *
+     * @return The bytes for nextPageToken.
+     */
+    public com.google.protobuf.ByteString getNextPageTokenBytes() {
+      java.lang.Object ref = nextPageToken_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b =
+            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
+        nextPageToken_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Token to retrieve the next page of results, or empty if there are no more
+     * results in the list.
+     * </pre>
+     *
+     * <code>string next_page_token = 2;</code>
+     *
+     * @param value The nextPageToken to set.
+     * @return This builder for chaining.
+     */
+    public Builder setNextPageToken(java.lang.String value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+
+      nextPageToken_ = value;
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Token to retrieve the next page of results, or empty if there are no more
+     * results in the list.
+     * </pre>
+     *
+     * <code>string next_page_token = 2;</code>
+     *
+     * @return This builder for chaining.
+     */
+    public Builder clearNextPageToken() {
+
+      nextPageToken_ = getDefaultInstance().getNextPageToken();
+      onChanged();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * Token to retrieve the next page of results, or empty if there are no more
+     * results in the list.
+     * </pre>
+     *
+     * <code>string next_page_token = 2;</code>
+     *
+     * @param value The bytes for nextPageToken to set.
+     * @return This builder for chaining.
+     */
+    public Builder setNextPageTokenBytes(com.google.protobuf.ByteString value) {
+      if (value == null) {
+        throw new NullPointerException();
+      }
+      checkByteStringIsUtf8(value);
+
+      nextPageToken_ = value;
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+    // @@protoc_insertion_point(builder_scope:google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse)
+  }
+
+  // @@protoc_insertion_point(class_scope:google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse)
+  private static final com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse
+      DEFAULT_INSTANCE;
+
+  static {
+    DEFAULT_INSTANCE = new com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse();
+  }
+
+  public static com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser<ListChangelogsResponse> PARSER =
+      new com.google.protobuf.AbstractParser<ListChangelogsResponse>() {
+        @java.lang.Override
+        public ListChangelogsResponse parsePartialFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws com.google.protobuf.InvalidProtocolBufferException {
+          return new ListChangelogsResponse(input, extensionRegistry);
+        }
+      };
+
+  public static com.google.protobuf.Parser<ListChangelogsResponse> parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser<ListChangelogsResponse> getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsResponseOrBuilder.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsResponseOrBuilder.java
new file mode 100644
index 000000000..1791792f9
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListChangelogsResponseOrBuilder.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: google/cloud/dialogflow/cx/v3beta1/changelog.proto
+
+package com.google.cloud.dialogflow.cx.v3beta1;
+
+public interface ListChangelogsResponseOrBuilder
+    extends
+    // @@protoc_insertion_point(interface_extends:google.cloud.dialogflow.cx.v3beta1.ListChangelogsResponse)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+   */
+  java.util.List<com.google.cloud.dialogflow.cx.v3beta1.Changelog> getChangelogsList();
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+   */
+  com.google.cloud.dialogflow.cx.v3beta1.Changelog getChangelogs(int index);
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+   */
+  int getChangelogsCount();
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+   */
+  java.util.List<? extends com.google.cloud.dialogflow.cx.v3beta1.ChangelogOrBuilder>
+      getChangelogsOrBuilderList();
+  /**
+   *
+   *
+   * <pre>
+   * The list of changelogs. There will be a maximum number of items returned
+   * based on the page_size field in the request. The changelogs will be ordered
+   * by timestamp.
+   * </pre>
+   *
+   * <code>repeated .google.cloud.dialogflow.cx.v3beta1.Changelog changelogs = 1;</code>
+   */
+  com.google.cloud.dialogflow.cx.v3beta1.ChangelogOrBuilder getChangelogsOrBuilder(int index);
+
+  /**
+   *
+   *
+   * <pre>
+   * Token to retrieve the next page of results, or empty if there are no more
+   * results in the list.
+   * </pre>
+   *
+   * <code>string next_page_token = 2;</code>
+   *
+   * @return The nextPageToken.
+   */
+  java.lang.String getNextPageToken();
+  /**
+   *
+   *
+   * <pre>
+   * Token to retrieve the next page of results, or empty if there are no more
+   * results in the list.
+   * </pre>
+   *
+   * <code>string next_page_token = 2;</code>
+   *
+   * @return The bytes for nextPageToken.
+   */
+  com.google.protobuf.ByteString getNextPageTokenBytes();
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListContinuousTestResultsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListContinuousTestResultsRequest.java
index ce6f01411..804d605bd 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListContinuousTestResultsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListContinuousTestResultsRequest.java
@@ -264,13 +264,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -282,13 +282,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListContinuousTestResultsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListContinuousTestResultsResponse.java
index 41dd10909..db43845e2 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListContinuousTestResultsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListContinuousTestResultsResponse.java
@@ -283,7 +283,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < continuousTestResults_.size(); i++) {
       output.writeMessage(1, continuousTestResults_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -300,7 +300,7 @@ public int getSerializedSize() {
           com.google.protobuf.CodedOutputStream.computeMessageSize(
               1, continuousTestResults_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListDeploymentsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListDeploymentsRequest.java
index 1e7464156..d39066a7e 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListDeploymentsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListDeploymentsRequest.java
@@ -263,13 +263,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -281,13 +281,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListDeploymentsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListDeploymentsResponse.java
index e59469b39..805623df1 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListDeploymentsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListDeploymentsResponse.java
@@ -282,7 +282,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < deployments_.size(); i++) {
       output.writeMessage(1, deployments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -297,7 +297,7 @@ public int getSerializedSize() {
     for (int i = 0; i < deployments_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, deployments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEntityTypesRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEntityTypesRequest.java
index 80db3103f..de5cecf85 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEntityTypesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEntityTypesRequest.java
@@ -336,16 +336,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -357,16 +357,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEntityTypesResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEntityTypesResponse.java
index d2145c7e0..09225d8c7 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEntityTypesResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEntityTypesResponse.java
@@ -272,7 +272,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < entityTypes_.size(); i++) {
       output.writeMessage(1, entityTypes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -287,7 +287,7 @@ public int getSerializedSize() {
     for (int i = 0; i < entityTypes_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, entityTypes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEnvironmentsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEnvironmentsRequest.java
index 8c5425478..cb519f33a 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEnvironmentsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEnvironmentsRequest.java
@@ -261,13 +261,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -279,13 +279,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEnvironmentsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEnvironmentsResponse.java
index 258d49882..9adcae76c 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEnvironmentsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListEnvironmentsResponse.java
@@ -282,7 +282,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < environments_.size(); i++) {
       output.writeMessage(1, environments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -297,7 +297,7 @@ public int getSerializedSize() {
     for (int i = 0; i < environments_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, environments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListExperimentsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListExperimentsRequest.java
index 6f9ccd7dd..c0c5a2cb3 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListExperimentsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListExperimentsRequest.java
@@ -263,13 +263,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -281,13 +281,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListExperimentsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListExperimentsResponse.java
index 7b8008b6e..fbd35fa6a 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListExperimentsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListExperimentsResponse.java
@@ -282,7 +282,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < experiments_.size(); i++) {
       output.writeMessage(1, experiments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -297,7 +297,7 @@ public int getSerializedSize() {
     for (int i = 0; i < experiments_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, experiments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListFlowsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListFlowsRequest.java
index 476aaf4be..fee1a2a75 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListFlowsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListFlowsRequest.java
@@ -338,16 +338,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -359,16 +359,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListFlowsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListFlowsResponse.java
index e9c3879e1..49615d7b1 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListFlowsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListFlowsResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < flows_.size(); i++) {
       output.writeMessage(1, flows_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < flows_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, flows_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListIntentsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListIntentsRequest.java
index b58d15421..fed049b77 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListIntentsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListIntentsRequest.java
@@ -376,16 +376,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, pageToken_);
     }
     if (intentView_
@@ -401,16 +401,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, pageToken_);
     }
     if (intentView_
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListIntentsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListIntentsResponse.java
index 67ee47f24..90dfdacb9 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListIntentsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListIntentsResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < intents_.size(); i++) {
       output.writeMessage(1, intents_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < intents_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, intents_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListPagesRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListPagesRequest.java
index 60ce2166c..7a99f65fd 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListPagesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListPagesRequest.java
@@ -356,16 +356,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -377,16 +377,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(3, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListPagesResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListPagesResponse.java
index 3f7469217..f5d877cd9 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListPagesResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListPagesResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < pages_.size(); i++) {
       output.writeMessage(1, pages_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < pages_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, pages_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSecuritySettingsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSecuritySettingsRequest.java
index 85d7d1cbb..4b48b0af6 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSecuritySettingsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSecuritySettingsRequest.java
@@ -261,13 +261,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -279,13 +279,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSecuritySettingsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSecuritySettingsResponse.java
index d8236deb2..0d62a7e4c 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSecuritySettingsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSecuritySettingsResponse.java
@@ -274,7 +274,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < securitySettings_.size(); i++) {
       output.writeMessage(1, securitySettings_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -289,7 +289,7 @@ public int getSerializedSize() {
     for (int i = 0; i < securitySettings_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, securitySettings_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSessionEntityTypesRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSessionEntityTypesRequest.java
index 242c4e85e..1dcc732a2 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSessionEntityTypesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSessionEntityTypesRequest.java
@@ -269,13 +269,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -287,13 +287,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSessionEntityTypesResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSessionEntityTypesResponse.java
index 8ca058dab..1e8e3c2f9 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSessionEntityTypesResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListSessionEntityTypesResponse.java
@@ -281,7 +281,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < sessionEntityTypes_.size(); i++) {
       output.writeMessage(1, sessionEntityTypes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -297,7 +297,7 @@ public int getSerializedSize() {
       size +=
           com.google.protobuf.CodedOutputStream.computeMessageSize(1, sessionEntityTypes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCaseResultsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCaseResultsRequest.java
index 18a0a291e..362a5ed23 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCaseResultsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCaseResultsRequest.java
@@ -358,16 +358,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, filter_);
     }
     unknownFields.writeTo(output);
@@ -379,16 +379,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, filter_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCaseResultsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCaseResultsResponse.java
index 5c78717a4..89a804a02 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCaseResultsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCaseResultsResponse.java
@@ -269,7 +269,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < testCaseResults_.size(); i++) {
       output.writeMessage(1, testCaseResults_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -284,7 +284,7 @@ public int getSerializedSize() {
     for (int i = 0; i < testCaseResults_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, testCaseResults_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCasesRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCasesRequest.java
index a32d49887..04f43f4ad 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCasesRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCasesRequest.java
@@ -471,13 +471,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     if (view_
@@ -495,13 +495,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     if (view_
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCasesResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCasesResponse.java
index 1b2ad224b..9be65b0e5 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCasesResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTestCasesResponse.java
@@ -270,7 +270,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < testCases_.size(); i++) {
       output.writeMessage(1, testCases_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -285,7 +285,7 @@ public int getSerializedSize() {
     for (int i = 0; i < testCases_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, testCases_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTransitionRouteGroupsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTransitionRouteGroupsRequest.java
index 14f8a48ca..3dfbf40e1 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTransitionRouteGroupsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTransitionRouteGroupsRequest.java
@@ -339,16 +339,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -360,16 +360,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTransitionRouteGroupsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTransitionRouteGroupsResponse.java
index bc31e0a46..d5f2a3cd8 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTransitionRouteGroupsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListTransitionRouteGroupsResponse.java
@@ -298,7 +298,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < transitionRouteGroups_.size(); i++) {
       output.writeMessage(1, transitionRouteGroups_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -315,7 +315,7 @@ public int getSerializedSize() {
           com.google.protobuf.CodedOutputStream.computeMessageSize(
               1, transitionRouteGroups_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListVersionsRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListVersionsRequest.java
index 7261b0a8a..cceeba857 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListVersionsRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListVersionsRequest.java
@@ -263,13 +263,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -281,13 +281,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListVersionsResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListVersionsResponse.java
index 786f5eead..7caf25f17 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListVersionsResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListVersionsResponse.java
@@ -275,7 +275,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < versions_.size(); i++) {
       output.writeMessage(1, versions_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -290,7 +290,7 @@ public int getSerializedSize() {
     for (int i = 0; i < versions_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, versions_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListWebhooksRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListWebhooksRequest.java
index 1433052f8..7e63f9a7d 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListWebhooksRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListWebhooksRequest.java
@@ -261,13 +261,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -279,13 +279,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListWebhooksResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListWebhooksResponse.java
index cc964672d..ca9ec585b 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListWebhooksResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ListWebhooksResponse.java
@@ -270,7 +270,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < webhooks_.size(); i++) {
       output.writeMessage(1, webhooks_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -285,7 +285,7 @@ public int getSerializedSize() {
     for (int i = 0; i < webhooks_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, webhooks_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LoadVersionRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LoadVersionRequest.java
index 26b28f11d..4d10070ae 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LoadVersionRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LoadVersionRequest.java
@@ -208,7 +208,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (allowOverrideAgentResources_ != false) {
@@ -223,7 +223,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (allowOverrideAgentResources_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LookupEnvironmentHistoryRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LookupEnvironmentHistoryRequest.java
index 5f81395b5..c34484ae6 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LookupEnvironmentHistoryRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LookupEnvironmentHistoryRequest.java
@@ -264,13 +264,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     unknownFields.writeTo(output);
@@ -282,13 +282,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LookupEnvironmentHistoryResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LookupEnvironmentHistoryResponse.java
index 6e7d2f58a..28481ff57 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LookupEnvironmentHistoryResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/LookupEnvironmentHistoryResponse.java
@@ -273,7 +273,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < environments_.size(); i++) {
       output.writeMessage(1, environments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -288,7 +288,7 @@ public int getSerializedSize() {
     for (int i = 0; i < environments_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, environments_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Match.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Match.java
index 6b0f8f511..3765a0028 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Match.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Match.java
@@ -732,7 +732,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (parameters_ != null) {
       output.writeMessage(2, getParameters());
     }
-    if (!getResolvedInputBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(resolvedInput_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, resolvedInput_);
     }
     if (matchType_
@@ -743,7 +743,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (confidence_ != 0F) {
       output.writeFloat(5, confidence_);
     }
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, event_);
     }
     unknownFields.writeTo(output);
@@ -761,7 +761,7 @@ public int getSerializedSize() {
     if (parameters_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getParameters());
     }
-    if (!getResolvedInputBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(resolvedInput_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, resolvedInput_);
     }
     if (matchType_
@@ -772,7 +772,7 @@ public int getSerializedSize() {
     if (confidence_ != 0F) {
       size += com.google.protobuf.CodedOutputStream.computeFloatSize(5, confidence_);
     }
-    if (!getEventBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(event_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, event_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/MatchIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/MatchIntentRequest.java
index e1bee4170..8f6a5ae86 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/MatchIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/MatchIntentRequest.java
@@ -334,7 +334,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, session_);
     }
     if (queryParams_ != null) {
@@ -352,7 +352,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, session_);
     }
     if (queryParams_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Page.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Page.java
index 79669e8a6..959ad6d70 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Page.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Page.java
@@ -761,10 +761,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     if (form_ != null) {
@@ -792,10 +792,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     if (form_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/PageInfo.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/PageInfo.java
index 6283429c9..2f3fc3e92 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/PageInfo.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/PageInfo.java
@@ -995,7 +995,7 @@ public final boolean isInitialized() {
 
       @java.lang.Override
       public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-        if (!getDisplayNameBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 1, displayName_);
         }
         if (required_ != false) {
@@ -1022,7 +1022,7 @@ public int getSerializedSize() {
         if (size != -1) return size;
 
         size = 0;
-        if (!getDisplayNameBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, displayName_);
         }
         if (required_ != false) {
@@ -3109,7 +3109,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getCurrentPageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(currentPage_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, currentPage_);
     }
     if (formInfo_ != null) {
@@ -3124,7 +3124,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getCurrentPageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(currentPage_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, currentPage_);
     }
     if (formInfo_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryInput.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryInput.java
index e6f1cfe44..e8ecae2e3 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryInput.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryInput.java
@@ -589,7 +589,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (inputCase_ == 3) {
       output.writeMessage(3, (com.google.cloud.dialogflow.cx.v3beta1.IntentInput) input_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, languageCode_);
     }
     if (inputCase_ == 5) {
@@ -620,7 +620,7 @@ public int getSerializedSize() {
           com.google.protobuf.CodedOutputStream.computeMessageSize(
               3, (com.google.cloud.dialogflow.cx.v3beta1.IntentInput) input_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, languageCode_);
     }
     if (inputCase_ == 5) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryParameters.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryParameters.java
index 37c28a19d..b635cdf48 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryParameters.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryParameters.java
@@ -937,7 +937,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getTimeZoneBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(timeZone_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, timeZone_);
     }
     if (geoLocation_ != null) {
@@ -952,7 +952,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (parameters_ != null) {
       output.writeMessage(5, getParameters());
     }
-    if (!getCurrentPageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(currentPage_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, currentPage_);
     }
     if (disableWebhook_ != false) {
@@ -975,7 +975,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getTimeZoneBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(timeZone_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, timeZone_);
     }
     if (geoLocation_ != null) {
@@ -991,7 +991,7 @@ public int getSerializedSize() {
     if (parameters_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(5, getParameters());
     }
-    if (!getCurrentPageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(currentPage_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, currentPage_);
     }
     if (disableWebhook_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryResult.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryResult.java
index 285cd932e..86060bace 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/QueryResult.java
@@ -1403,7 +1403,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (queryCase_ == 1) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, query_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (parameters_ != null) {
@@ -1460,7 +1460,7 @@ public int getSerializedSize() {
     if (queryCase_ == 1) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, query_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (parameters_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ResourceName.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ResourceName.java
index 377ee9be3..e7ca362cd 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ResourceName.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ResourceName.java
@@ -231,10 +231,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     unknownFields.writeTo(output);
@@ -246,10 +246,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ResponseMessage.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ResponseMessage.java
index 0c26ead74..a1b88940c 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ResponseMessage.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ResponseMessage.java
@@ -4709,7 +4709,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getAudioUriBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(audioUri_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, audioUri_);
       }
       if (allowPlaybackInterruption_ != false) {
@@ -4724,7 +4724,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getAudioUriBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(audioUri_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, audioUri_);
       }
       if (allowPlaybackInterruption_ != false) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RestoreAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RestoreAgentRequest.java
index 7ee3624bf..1090f51d2 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RestoreAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RestoreAgentRequest.java
@@ -566,7 +566,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (agentCase_ == 2) {
@@ -590,7 +590,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (agentCase_ == 2) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RolloutConfig.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RolloutConfig.java
index 4201709a5..49cb7ff4d 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RolloutConfig.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RolloutConfig.java
@@ -472,7 +472,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, displayName_);
       }
       if (trafficPercent_ != 0) {
@@ -490,7 +490,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, displayName_);
       }
       if (trafficPercent_ != 0) {
@@ -1464,10 +1464,10 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < rolloutSteps_.size(); i++) {
       output.writeMessage(1, rolloutSteps_.get(i));
     }
-    if (!getRolloutConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(rolloutCondition_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, rolloutCondition_);
     }
-    if (!getFailureConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(failureCondition_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, failureCondition_);
     }
     unknownFields.writeTo(output);
@@ -1482,10 +1482,10 @@ public int getSerializedSize() {
     for (int i = 0; i < rolloutSteps_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, rolloutSteps_.get(i));
     }
-    if (!getRolloutConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(rolloutCondition_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, rolloutCondition_);
     }
-    if (!getFailureConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(failureCondition_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, failureCondition_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RolloutState.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RolloutState.java
index 0f496e619..87863cf91 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RolloutState.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RolloutState.java
@@ -258,7 +258,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getStepBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(step_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, step_);
     }
     if (startTime_ != null) {
@@ -276,7 +276,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getStepBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(step_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, step_);
     }
     if (startTime_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RunContinuousTestRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RunContinuousTestRequest.java
index 24a9083e9..e54610819 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RunContinuousTestRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RunContinuousTestRequest.java
@@ -180,7 +180,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, environment_);
     }
     unknownFields.writeTo(output);
@@ -192,7 +192,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, environment_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RunTestCaseRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RunTestCaseRequest.java
index 554243e5b..6c2c1c744 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RunTestCaseRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/RunTestCaseRequest.java
@@ -245,10 +245,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, environment_);
     }
     unknownFields.writeTo(output);
@@ -260,10 +260,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, environment_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SecuritySettings.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SecuritySettings.java
index 0b6ef102f..20d179844 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SecuritySettings.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SecuritySettings.java
@@ -1840,10 +1840,10 @@ public final boolean isInitialized() {
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
     getSerializedSize();
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     if (redactionStrategy_
@@ -1868,13 +1868,13 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < purgeDataTypes_.size(); i++) {
       output.writeEnumNoTag(purgeDataTypes_.get(i));
     }
-    if (!getInspectTemplateBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(inspectTemplate_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 9, inspectTemplate_);
     }
     if (insightsExportSettings_ != null) {
       output.writeMessage(13, getInsightsExportSettings());
     }
-    if (!getDeidentifyTemplateBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(deidentifyTemplate_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 17, deidentifyTemplate_);
     }
     unknownFields.writeTo(output);
@@ -1886,10 +1886,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     if (redactionStrategy_
@@ -1922,14 +1922,14 @@ public int getSerializedSize() {
       }
       purgeDataTypesMemoizedSerializedSize = dataSize;
     }
-    if (!getInspectTemplateBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(inspectTemplate_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(9, inspectTemplate_);
     }
     if (insightsExportSettings_ != null) {
       size +=
           com.google.protobuf.CodedOutputStream.computeMessageSize(13, getInsightsExportSettings());
     }
-    if (!getDeidentifyTemplateBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(deidentifyTemplate_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(17, deidentifyTemplate_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SessionEntityType.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SessionEntityType.java
index 464dcdcfe..8e95e6212 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SessionEntityType.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SessionEntityType.java
@@ -532,7 +532,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (entityOverrideMode_
@@ -553,7 +553,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (entityOverrideMode_
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SessionInfo.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SessionInfo.java
index 32368d157..c82a98b31 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SessionInfo.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SessionInfo.java
@@ -338,7 +338,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, session_);
     }
     com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
@@ -352,7 +352,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, session_);
     }
     for (java.util.Map.Entry<java.lang.String, com.google.protobuf.Value> entry :
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SpeechWordInfo.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SpeechWordInfo.java
index 16c8bca28..d33080f41 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SpeechWordInfo.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/SpeechWordInfo.java
@@ -342,7 +342,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (endOffset_ != null) {
       output.writeMessage(2, getEndOffset());
     }
-    if (!getWordBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(word_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, word_);
     }
     if (confidence_ != 0F) {
@@ -363,7 +363,7 @@ public int getSerializedSize() {
     if (endOffset_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getEndOffset());
     }
-    if (!getWordBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(word_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, word_);
     }
     if (confidence_ != 0F) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StartExperimentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StartExperimentRequest.java
index 0f926fe27..8b4db6668 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StartExperimentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StartExperimentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StopExperimentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StopExperimentRequest.java
index 8036a1c27..3362af478 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StopExperimentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StopExperimentRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingDetectIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingDetectIntentRequest.java
index 715452505..092ad8c7b 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingDetectIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingDetectIntentRequest.java
@@ -26,7 +26,7 @@
  * [Sessions.StreamingDetectIntent][google.cloud.dialogflow.cx.v3beta1.Sessions.StreamingDetectIntent] method.
  * Multiple request messages should be sent in order:
  * 1.  The first message must contain
- * [session][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.session],
+ *     [session][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.session],
  *     [query_input][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.query_input] plus optionally
  *     [query_params][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.query_params]. If the client
  *     wants to receive an audio response, it should also contain
@@ -451,7 +451,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, session_);
     }
     if (queryParams_ != null) {
@@ -475,7 +475,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getSessionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(session_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, session_);
     }
     if (queryParams_ != null) {
@@ -657,7 +657,7 @@ protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.Build
    * [Sessions.StreamingDetectIntent][google.cloud.dialogflow.cx.v3beta1.Sessions.StreamingDetectIntent] method.
    * Multiple request messages should be sent in order:
    * 1.  The first message must contain
-   * [session][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.session],
+   *     [session][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.session],
    *     [query_input][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.query_input] plus optionally
    *     [query_params][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.query_params]. If the client
    *     wants to receive an audio response, it should also contain
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingDetectIntentResponse.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingDetectIntentResponse.java
index 478e3cc39..97de6f248 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingDetectIntentResponse.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingDetectIntentResponse.java
@@ -22,18 +22,24 @@
  *
  *
  * <pre>
- * The top-level message returned from the `StreamingDetectIntent` method.
- * Multiple response messages can be returned in order:
- * 1.  If the input was set to streaming audio, the first one or more messages
- *     contain `recognition_result`. Each `recognition_result` represents a more
- *     complete transcript of what the user said. The last `recognition_result`
- *     has `is_final` set to `true`.
- * 2.  If `enable_partial_response` is true, the following N messages
- *     (currently 1 &lt;= N &lt;= 4) contain `detect_intent_response`. The first (N-1)
- *     `detect_intent_response`s will have `response_type` set to `PARTIAL`.
- *     The last `detect_intent_response` has `response_type` set to `FINAL`.
- *     If `response_type` is false, response stream only contains
- *     the final `detect_intent_response`.
+ * The top-level message returned from the
+ * [StreamingDetectIntent][google.cloud.dialogflow.cx.v3beta1.Sessions.StreamingDetectIntent] method.
+ * Multiple response messages (N) can be returned in order.
+ * The first (N-1) responses set either the `recognition_result` or
+ * `detect_intent_response` field, depending on the request:
+ * *   If the `StreamingDetectIntentRequest.query_input.audio` field was
+ *     set, and the `StreamingDetectIntentRequest.enable_partial_response`
+ *     field was false, the `recognition_result` field is populated for each
+ *     of the (N-1) responses.
+ *     See the [StreamingRecognitionResult][google.cloud.dialogflow.cx.v3beta1.StreamingRecognitionResult] message for details
+ *     about the result message sequence.
+ * *   If the `StreamingDetectIntentRequest.enable_partial_response` field was
+ *     true, the `detect_intent_response` field is populated for each
+ *     of the (N-1) responses, where 1 &lt;= N &lt;= 4.
+ *     These responses set the [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3beta1.DetectIntentResponse.response_type] field
+ *     to `PARTIAL`.
+ * For the final Nth response message, the `detect_intent_response` is fully
+ * populated, and [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3beta1.DetectIntentResponse.response_type] is set to `FINAL`.
  * </pre>
  *
  * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentResponse}
@@ -508,18 +514,24 @@ protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.Build
    *
    *
    * <pre>
-   * The top-level message returned from the `StreamingDetectIntent` method.
-   * Multiple response messages can be returned in order:
-   * 1.  If the input was set to streaming audio, the first one or more messages
-   *     contain `recognition_result`. Each `recognition_result` represents a more
-   *     complete transcript of what the user said. The last `recognition_result`
-   *     has `is_final` set to `true`.
-   * 2.  If `enable_partial_response` is true, the following N messages
-   *     (currently 1 &lt;= N &lt;= 4) contain `detect_intent_response`. The first (N-1)
-   *     `detect_intent_response`s will have `response_type` set to `PARTIAL`.
-   *     The last `detect_intent_response` has `response_type` set to `FINAL`.
-   *     If `response_type` is false, response stream only contains
-   *     the final `detect_intent_response`.
+   * The top-level message returned from the
+   * [StreamingDetectIntent][google.cloud.dialogflow.cx.v3beta1.Sessions.StreamingDetectIntent] method.
+   * Multiple response messages (N) can be returned in order.
+   * The first (N-1) responses set either the `recognition_result` or
+   * `detect_intent_response` field, depending on the request:
+   * *   If the `StreamingDetectIntentRequest.query_input.audio` field was
+   *     set, and the `StreamingDetectIntentRequest.enable_partial_response`
+   *     field was false, the `recognition_result` field is populated for each
+   *     of the (N-1) responses.
+   *     See the [StreamingRecognitionResult][google.cloud.dialogflow.cx.v3beta1.StreamingRecognitionResult] message for details
+   *     about the result message sequence.
+   * *   If the `StreamingDetectIntentRequest.enable_partial_response` field was
+   *     true, the `detect_intent_response` field is populated for each
+   *     of the (N-1) responses, where 1 &lt;= N &lt;= 4.
+   *     These responses set the [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3beta1.DetectIntentResponse.response_type] field
+   *     to `PARTIAL`.
+   * For the final Nth response message, the `detect_intent_response` is fully
+   * populated, and [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3beta1.DetectIntentResponse.response_type] is set to `FINAL`.
    * </pre>
    *
    * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentResponse}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingRecognitionResult.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingRecognitionResult.java
index b1fb9c647..3f94e9984 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingRecognitionResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/StreamingRecognitionResult.java
@@ -25,23 +25,34 @@
  * Contains a speech recognition result corresponding to a portion of the audio
  * that is currently being processed or an indication that this is the end
  * of the single requested utterance.
- * Example:
- * 1.  transcript: "tube"
- * 2.  transcript: "to be a"
- * 3.  transcript: "to be"
- * 4.  transcript: "to be or not to be"
- *     is_final: true
- * 5.  transcript: " that's"
- * 6.  transcript: " that is"
- * 7.  message_type: `END_OF_SINGLE_UTTERANCE`
- * 8.  transcript: " that is the question"
- *     is_final: true
- * Only two of the responses contain final results (#4 and #8 indicated by
- * `is_final: true`). Concatenating these generates the full transcript: "to be
- * or not to be that is the question".
- * In each response we populate:
- * *  for `TRANSCRIPT`: `transcript` and possibly `is_final`.
- * *  for `END_OF_SINGLE_UTTERANCE`: only `message_type`.
+ * While end-user audio is being processed, Dialogflow sends a series of
+ * results. Each result may contain a `transcript` value. A transcript
+ * represents a portion of the utterance. While the recognizer is processing
+ * audio, transcript values may be interim values or finalized values.
+ * Once a transcript is finalized, the `is_final` value is set to true and
+ * processing continues for the next transcript.
+ * If `StreamingDetectIntentRequest.query_input.audio.config.single_utterance`
+ * was true, and the recognizer has completed processing audio,
+ * the `message_type` value is set to `END_OF_SINGLE_UTTERANCE and the
+ * following (last) result contains the last finalized transcript.
+ * The complete end-user utterance is determined by concatenating the
+ * finalized transcript values received for the series of results.
+ * In the following example, single utterance is enabled. In the case where
+ * single utterance is not enabled, result 7 would not occur.
+ * ```
+ * Num | transcript              | message_type            | is_final
+ * --- | ----------------------- | ----------------------- | --------
+ * 1   | "tube"                  | TRANSCRIPT              | false
+ * 2   | "to be a"               | TRANSCRIPT              | false
+ * 3   | "to be"                 | TRANSCRIPT              | false
+ * 4   | "to be or not to be"    | TRANSCRIPT              | true
+ * 5   | "that's"                | TRANSCRIPT              | false
+ * 6   | "that is                | TRANSCRIPT              | false
+ * 7   | unset                   | END_OF_SINGLE_UTTERANCE | unset
+ * 8   | " that is the question" | TRANSCRIPT              | true
+ * ```
+ * Concatenating the finalized transcripts with `is_final` set to true,
+ * the complete utterance becomes "to be or not to be that is the question".
  * </pre>
  *
  * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.StreamingRecognitionResult}
@@ -735,7 +746,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(1, messageType_);
     }
-    if (!getTranscriptBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(transcript_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, transcript_);
     }
     if (isFinal_ != false) {
@@ -753,7 +764,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (speechEndOffset_ != null) {
       output.writeMessage(8, getSpeechEndOffset());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 10, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -771,7 +782,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(1, messageType_);
     }
-    if (!getTranscriptBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(transcript_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, transcript_);
     }
     if (isFinal_ != false) {
@@ -789,7 +800,7 @@ public int getSerializedSize() {
     if (speechEndOffset_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(8, getSpeechEndOffset());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(10, languageCode_);
     }
     size += unknownFields.getSerializedSize();
@@ -961,23 +972,34 @@ protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.Build
    * Contains a speech recognition result corresponding to a portion of the audio
    * that is currently being processed or an indication that this is the end
    * of the single requested utterance.
-   * Example:
-   * 1.  transcript: "tube"
-   * 2.  transcript: "to be a"
-   * 3.  transcript: "to be"
-   * 4.  transcript: "to be or not to be"
-   *     is_final: true
-   * 5.  transcript: " that's"
-   * 6.  transcript: " that is"
-   * 7.  message_type: `END_OF_SINGLE_UTTERANCE`
-   * 8.  transcript: " that is the question"
-   *     is_final: true
-   * Only two of the responses contain final results (#4 and #8 indicated by
-   * `is_final: true`). Concatenating these generates the full transcript: "to be
-   * or not to be that is the question".
-   * In each response we populate:
-   * *  for `TRANSCRIPT`: `transcript` and possibly `is_final`.
-   * *  for `END_OF_SINGLE_UTTERANCE`: only `message_type`.
+   * While end-user audio is being processed, Dialogflow sends a series of
+   * results. Each result may contain a `transcript` value. A transcript
+   * represents a portion of the utterance. While the recognizer is processing
+   * audio, transcript values may be interim values or finalized values.
+   * Once a transcript is finalized, the `is_final` value is set to true and
+   * processing continues for the next transcript.
+   * If `StreamingDetectIntentRequest.query_input.audio.config.single_utterance`
+   * was true, and the recognizer has completed processing audio,
+   * the `message_type` value is set to `END_OF_SINGLE_UTTERANCE and the
+   * following (last) result contains the last finalized transcript.
+   * The complete end-user utterance is determined by concatenating the
+   * finalized transcript values received for the series of results.
+   * In the following example, single utterance is enabled. In the case where
+   * single utterance is not enabled, result 7 would not occur.
+   * ```
+   * Num | transcript              | message_type            | is_final
+   * --- | ----------------------- | ----------------------- | --------
+   * 1   | "tube"                  | TRANSCRIPT              | false
+   * 2   | "to be a"               | TRANSCRIPT              | false
+   * 3   | "to be"                 | TRANSCRIPT              | false
+   * 4   | "to be or not to be"    | TRANSCRIPT              | true
+   * 5   | "that's"                | TRANSCRIPT              | false
+   * 6   | "that is                | TRANSCRIPT              | false
+   * 7   | unset                   | END_OF_SINGLE_UTTERANCE | unset
+   * 8   | " that is the question" | TRANSCRIPT              | true
+   * ```
+   * Concatenating the finalized transcripts with `is_final` set to true,
+   * the complete utterance becomes "to be or not to be that is the question".
    * </pre>
    *
    * Protobuf type {@code google.cloud.dialogflow.cx.v3beta1.StreamingRecognitionResult}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestCase.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestCase.java
index 24d6e05fb..9ca726c33 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestCase.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestCase.java
@@ -692,16 +692,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     for (int i = 0; i < tags_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, tags_.getRaw(i));
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, displayName_);
     }
-    if (!getNotesBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(notes_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, notes_);
     }
     for (int i = 0; i < testCaseConversationTurns_.size(); i++) {
@@ -725,7 +725,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     {
@@ -736,10 +736,10 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getTagsList().size();
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, displayName_);
     }
-    if (!getNotesBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(notes_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, notes_);
     }
     for (int i = 0; i < testCaseConversationTurns_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestCaseResult.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestCaseResult.java
index ceddde35f..7bef8c655 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestCaseResult.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestCaseResult.java
@@ -443,10 +443,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, environment_);
     }
     for (int i = 0; i < conversationTurns_.size(); i++) {
@@ -468,10 +468,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getEnvironmentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(environment_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, environment_);
     }
     for (int i = 0; i < conversationTurns_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestConfig.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestConfig.java
index c2439ae4e..31a366f8c 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestConfig.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestConfig.java
@@ -257,7 +257,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < trackingParameters_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, trackingParameters_.getRaw(i));
     }
-    if (!getFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flow_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, flow_);
     }
     unknownFields.writeTo(output);
@@ -277,7 +277,7 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getTrackingParametersList().size();
     }
-    if (!getFlowBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(flow_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, flow_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestError.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestError.java
index 06f2209ce..77d7c9ca8 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestError.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestError.java
@@ -295,7 +295,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getTestCaseBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(testCase_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, testCase_);
     }
     if (status_ != null) {
@@ -313,7 +313,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getTestCaseBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(testCase_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, testCase_);
     }
     if (status_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestRunDifference.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestRunDifference.java
index e8e74d57b..6fe527a24 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestRunDifference.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TestRunDifference.java
@@ -428,7 +428,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(1, type_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, description_);
     }
     unknownFields.writeTo(output);
@@ -445,7 +445,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(1, type_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, description_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TextInput.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TextInput.java
index b009a8614..50c337f43 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TextInput.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TextInput.java
@@ -176,7 +176,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getTextBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(text_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, text_);
     }
     unknownFields.writeTo(output);
@@ -188,7 +188,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getTextBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(text_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, text_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TrainFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TrainFlowRequest.java
index e66662a01..0c6a6b7ff 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TrainFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TrainFlowRequest.java
@@ -182,7 +182,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -194,7 +194,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TransitionRoute.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TransitionRoute.java
index f01c543c7..cbd4607ea 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TransitionRoute.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TransitionRoute.java
@@ -608,10 +608,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getIntentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, intent_);
     }
-    if (!getConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, condition_);
     }
     if (triggerFulfillment_ != null) {
@@ -623,7 +623,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (targetCase_ == 5) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, target_);
     }
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, name_);
     }
     unknownFields.writeTo(output);
@@ -635,10 +635,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getIntentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(intent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, intent_);
     }
-    if (!getConditionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(condition_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, condition_);
     }
     if (triggerFulfillment_ != null) {
@@ -650,7 +650,7 @@ public int getSerializedSize() {
     if (targetCase_ == 5) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, target_);
     }
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TransitionRouteGroup.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TransitionRouteGroup.java
index 7da4ff878..f6613e46b 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TransitionRouteGroup.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/TransitionRouteGroup.java
@@ -337,10 +337,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     for (int i = 0; i < transitionRoutes_.size(); i++) {
@@ -355,10 +355,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     for (int i = 0; i < transitionRoutes_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateEntityTypeRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateEntityTypeRequest.java
index ae2d6105a..ce1739e98 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateEntityTypeRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateEntityTypeRequest.java
@@ -325,7 +325,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (entityType_ != null) {
       output.writeMessage(1, getEntityType());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (updateMask_ != null) {
@@ -343,7 +343,7 @@ public int getSerializedSize() {
     if (entityType_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, getEntityType());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (updateMask_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateFlowRequest.java
index 96a56059d..31d1de8b3 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateFlowRequest.java
@@ -330,7 +330,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (updateMask_ != null) {
       output.writeMessage(2, getUpdateMask());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -348,7 +348,7 @@ public int getSerializedSize() {
     if (updateMask_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getUpdateMask());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateIntentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateIntentRequest.java
index 882c54da6..00c8de493 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateIntentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateIntentRequest.java
@@ -323,7 +323,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (intent_ != null) {
       output.writeMessage(1, getIntent());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (updateMask_ != null) {
@@ -341,7 +341,7 @@ public int getSerializedSize() {
     if (intent_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, getIntent());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (updateMask_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdatePageRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdatePageRequest.java
index 67119bf26..691786d2a 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdatePageRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdatePageRequest.java
@@ -343,7 +343,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (page_ != null) {
       output.writeMessage(1, getPage());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     if (updateMask_ != null) {
@@ -361,7 +361,7 @@ public int getSerializedSize() {
     if (page_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, getPage());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     if (updateMask_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateTransitionRouteGroupRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateTransitionRouteGroupRequest.java
index 36bad2851..52ab688af 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateTransitionRouteGroupRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/UpdateTransitionRouteGroupRequest.java
@@ -330,7 +330,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (updateMask_ != null) {
       output.writeMessage(2, getUpdateMask());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -349,7 +349,7 @@ public int getSerializedSize() {
     if (updateMask_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getUpdateMask());
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidateAgentRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidateAgentRequest.java
index d00ac2e96..251a80584 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidateAgentRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidateAgentRequest.java
@@ -237,10 +237,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -252,10 +252,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidateFlowRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidateFlowRequest.java
index 79362d65f..cd2bdccdc 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidateFlowRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidateFlowRequest.java
@@ -239,10 +239,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -254,10 +254,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidationMessage.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidationMessage.java
index 1251d3987..135de9d0d 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidationMessage.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/ValidationMessage.java
@@ -1033,7 +1033,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(3, severity_);
     }
-    if (!getDetailBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(detail_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, detail_);
     }
     for (int i = 0; i < resourceNames_.size(); i++) {
@@ -1067,7 +1067,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(3, severity_);
     }
-    if (!getDetailBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(detail_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, detail_);
     }
     for (int i = 0; i < resourceNames_.size(); i++) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Version.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Version.java
index f36e7f86d..229728533 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Version.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Version.java
@@ -660,13 +660,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, description_);
     }
     if (nluSettings_ != null) {
@@ -688,13 +688,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, description_);
     }
     if (nluSettings_ != null) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/VersionVariants.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/VersionVariants.java
index 2cf87f7bd..29f315ac9 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/VersionVariants.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/VersionVariants.java
@@ -390,7 +390,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getVersionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, version_);
       }
       if (trafficAllocation_ != 0F) {
@@ -408,7 +408,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getVersionBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(version_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, version_);
       }
       if (trafficAllocation_ != 0F) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/VoiceSelectionParams.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/VoiceSelectionParams.java
index 58d0eae52..6cb8d0396 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/VoiceSelectionParams.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/VoiceSelectionParams.java
@@ -236,7 +236,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (ssmlGender_
@@ -253,7 +253,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (ssmlGender_
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Webhook.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Webhook.java
index badb7c01d..9ee774c49 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Webhook.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/Webhook.java
@@ -739,13 +739,13 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getUriBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uri_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, uri_);
       }
-      if (!getUsernameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(username_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 2, username_);
       }
-      if (!getPasswordBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(password_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 3, password_);
       }
       com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
@@ -759,13 +759,13 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getUriBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uri_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, uri_);
       }
-      if (!getUsernameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(username_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, username_);
       }
-      if (!getPasswordBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(password_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, password_);
       }
       for (java.util.Map.Entry<java.lang.String, java.lang.String> entry :
@@ -2010,7 +2010,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getServiceBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(service_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, service_);
       }
       if (genericWebService_ != null) {
@@ -2025,7 +2025,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getServiceBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(service_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, service_);
       }
       if (genericWebService_ != null) {
@@ -3122,10 +3122,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
     if (webhookCase_ == 4) {
@@ -3151,10 +3151,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
     if (webhookCase_ == 4) {
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/WebhookRequest.java b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/WebhookRequest.java
index 50639052a..eb6120fb4 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/WebhookRequest.java
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/java/com/google/cloud/dialogflow/cx/v3beta1/WebhookRequest.java
@@ -460,7 +460,7 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getTagBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(tag_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, tag_);
       }
       unknownFields.writeTo(output);
@@ -472,7 +472,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getTagBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(tag_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, tag_);
       }
       size += unknownFields.getSerializedSize();
@@ -1543,7 +1543,7 @@ public final boolean isInitialized() {
 
       @java.lang.Override
       public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-        if (!getOriginalValueBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(originalValue_)) {
           com.google.protobuf.GeneratedMessageV3.writeString(output, 1, originalValue_);
         }
         if (resolvedValue_ != null) {
@@ -1558,7 +1558,7 @@ public int getSerializedSize() {
         if (size != -1) return size;
 
         size = 0;
-        if (!getOriginalValueBytes().isEmpty()) {
+        if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(originalValue_)) {
           size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, originalValue_);
         }
         if (resolvedValue_ != null) {
@@ -2577,12 +2577,12 @@ public final boolean isInitialized() {
 
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-      if (!getLastMatchedIntentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(lastMatchedIntent_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, lastMatchedIntent_);
       }
       com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
           output, internalGetParameters(), ParametersDefaultEntryHolder.defaultEntry, 2);
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 3, displayName_);
       }
       if (confidence_ != 0F) {
@@ -2597,7 +2597,7 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (!getLastMatchedIntentBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(lastMatchedIntent_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, lastMatchedIntent_);
       }
       for (java.util.Map.Entry<
@@ -2616,7 +2616,7 @@ public int getSerializedSize() {
                     .build();
         size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, parameters__);
       }
-      if (!getDisplayNameBytes().isEmpty()) {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, displayName_);
       }
       if (confidence_ != 0F) {
@@ -5099,7 +5099,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getDetectIntentResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(detectIntentResponseId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, detectIntentResponseId_);
     }
     if (intentInfo_ != null) {
@@ -5135,7 +5135,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (queryCase_ == 14) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 14, query_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 15, languageCode_);
     }
     unknownFields.writeTo(output);
@@ -5147,7 +5147,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getDetectIntentResponseIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(detectIntentResponseId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, detectIntentResponseId_);
     }
     if (intentInfo_ != null) {
@@ -5184,7 +5184,7 @@ public int getSerializedSize() {
     if (queryCase_ == 14) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(14, query_);
     }
-    if (!getLanguageCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(languageCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(15, languageCode_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/proto/google/cloud/dialogflow/cx/v3beta1/changelog.proto b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/proto/google/cloud/dialogflow/cx/v3beta1/changelog.proto
new file mode 100644
index 000000000..55a75a861
--- /dev/null
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/proto/google/cloud/dialogflow/cx/v3beta1/changelog.proto
@@ -0,0 +1,154 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.cloud.dialogflow.cx.v3beta1;
+
+import "google/api/annotations.proto";
+import "google/api/client.proto";
+import "google/api/field_behavior.proto";
+import "google/api/resource.proto";
+import "google/protobuf/struct.proto";
+import "google/protobuf/timestamp.proto";
+
+option cc_enable_arenas = true;
+option csharp_namespace = "Google.Cloud.Dialogflow.Cx.V3Beta1";
+option go_package = "google.golang.org/genproto/googleapis/cloud/dialogflow/cx/v3beta1;cx";
+option java_multiple_files = true;
+option java_outer_classname = "ChangelogProto";
+option java_package = "com.google.cloud.dialogflow.cx.v3beta1";
+option objc_class_prefix = "DF";
+option ruby_package = "Google::Cloud::Dialogflow::CX::V3beta1";
+
+// Service for managing [Changelogs][google.cloud.dialogflow.cx.v3beta1.Changelog].
+service Changelogs {
+  option (google.api.default_host) = "dialogflow.googleapis.com";
+  option (google.api.oauth_scopes) =
+      "https://www.googleapis.com/auth/cloud-platform,"
+      "https://www.googleapis.com/auth/dialogflow";
+
+  // Returns the list of Changelogs.
+  rpc ListChangelogs(ListChangelogsRequest) returns (ListChangelogsResponse) {
+    option (google.api.http) = {
+      get: "/v3beta1/{parent=projects/*/locations/*/agents/*}/changelogs"
+    };
+    option (google.api.method_signature) = "parent";
+  }
+
+  // Retrieves the specified Changelog.
+  rpc GetChangelog(GetChangelogRequest) returns (Changelog) {
+    option (google.api.http) = {
+      get: "/v3beta1/{name=projects/*/locations/*/agents/*/changelogs/*}"
+    };
+    option (google.api.method_signature) = "name";
+  }
+}
+
+// The request message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3beta1.Changelogs.ListChangelogs].
+message ListChangelogsRequest {
+  // Required. The agent containing the changelogs.
+  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent ID>`.
+  string parent = 1 [
+    (google.api.field_behavior) = REQUIRED,
+    (google.api.resource_reference) = {
+      child_type: "dialogflow.googleapis.com/Changelog"
+    }
+  ];
+
+  // The filter string. Supports filter by user_email, resource, type and
+  // create_time. Some examples:
+  //   1. By user email:
+  //        user_email = "someone@google.com"
+  //   2. By resource name:
+  //        resource = "projects/123/locations/global/agents/456/flows/789"
+  //   3. By resource display name:
+  //        display_name = "my agent"
+  //   4. By action:
+  //        action = "Create"
+  //   5. By type:
+  //        type = "flows"
+  //   6. By create time. Currently predicates on `create_time` and
+  //      `create_time_epoch_seconds` are supported:
+  //        create_time_epoch_seconds > 1551790877 AND create_time <=
+  //        2017-01-15T01:30:15.01Z
+  //   7. Combination of above filters:
+  //        resource = "projects/123/locations/global/agents/456/flows/789"
+  //          AND user_email = "someone@google.com"
+  //          AND create_time <= 2017-01-15T01:30:15.01Z
+  string filter = 2;
+
+  // The maximum number of items to return in a single page. By default 100 and
+  // at most 1000.
+  int32 page_size = 3;
+
+  // The next_page_token value returned from a previous list request.
+  string page_token = 4;
+}
+
+// The response message for [Changelogs.ListChangelogs][google.cloud.dialogflow.cx.v3beta1.Changelogs.ListChangelogs].
+message ListChangelogsResponse {
+  // The list of changelogs. There will be a maximum number of items returned
+  // based on the page_size field in the request. The changelogs will be ordered
+  // by timestamp.
+  repeated Changelog changelogs = 1;
+
+  // Token to retrieve the next page of results, or empty if there are no more
+  // results in the list.
+  string next_page_token = 2;
+}
+
+// The request message for [Changelogs.GetChangelog][google.cloud.dialogflow.cx.v3beta1.Changelogs.GetChangelog].
+message GetChangelogRequest {
+  // Required. The name of the changelog to get.
+  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent
+  // ID>/changelogs/<Changelog ID>`.
+  string name = 1 [
+    (google.api.field_behavior) = REQUIRED,
+    (google.api.resource_reference) = {
+      type: "dialogflow.googleapis.com/Changelog"
+    }
+  ];
+}
+
+// Changelogs represents a change made to a given agent.
+message Changelog {
+  option (google.api.resource) = {
+    type: "dialogflow.googleapis.com/Changelog"
+    pattern: "projects/{project}/locations/{location}/agents/{agent}/changelogs/{changelog}"
+  };
+
+  // The unique identifier of the changelog.
+  // Format: `projects/<Project ID>/locations/<Location ID>/agents/<Agent
+  // ID>/changelogs/<Changelog ID>`.
+  string name = 1;
+
+  // Email address of the authenticated user.
+  string user_email = 2;
+
+  // The affected resource display name of the change.
+  string display_name = 7;
+
+  // The action of the change.
+  string action = 11;
+
+  // The affected resource type.
+  string type = 8;
+
+  // The affected resource name of the change.
+  string resource = 3;
+
+  // The timestamp of the change.
+  google.protobuf.Timestamp create_time = 4;
+}
diff --git a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/proto/google/cloud/dialogflow/cx/v3beta1/session.proto b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/proto/google/cloud/dialogflow/cx/v3beta1/session.proto
index a82ef3bd4..39ebb2a5d 100644
--- a/proto-google-cloud-dialogflow-cx-v3beta1/src/main/proto/google/cloud/dialogflow/cx/v3beta1/session.proto
+++ b/proto-google-cloud-dialogflow-cx-v3beta1/src/main/proto/google/cloud/dialogflow/cx/v3beta1/session.proto
@@ -201,7 +201,7 @@ message DetectIntentResponse {
 // Multiple request messages should be sent in order:
 //
 // 1.  The first message must contain
-// [session][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.session],
+//     [session][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.session],
 //     [query_input][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.query_input] plus optionally
 //     [query_params][google.cloud.dialogflow.cx.v3beta1.StreamingDetectIntentRequest.query_params]. If the client
 //     wants to receive an audio response, it should also contain
@@ -261,21 +261,29 @@ message StreamingDetectIntentRequest {
   bool enable_partial_response = 5;
 }
 
-// The top-level message returned from the `StreamingDetectIntent` method.
+// The top-level message returned from the
+// [StreamingDetectIntent][google.cloud.dialogflow.cx.v3beta1.Sessions.StreamingDetectIntent] method.
 //
-// Multiple response messages can be returned in order:
+// Multiple response messages (N) can be returned in order.
 //
-// 1.  If the input was set to streaming audio, the first one or more messages
-//     contain `recognition_result`. Each `recognition_result` represents a more
-//     complete transcript of what the user said. The last `recognition_result`
-//     has `is_final` set to `true`.
+// The first (N-1) responses set either the `recognition_result` or
+// `detect_intent_response` field, depending on the request:
 //
-// 2.  If `enable_partial_response` is true, the following N messages
-//     (currently 1 <= N <= 4) contain `detect_intent_response`. The first (N-1)
-//     `detect_intent_response`s will have `response_type` set to `PARTIAL`.
-//     The last `detect_intent_response` has `response_type` set to `FINAL`.
-//     If `response_type` is false, response stream only contains
-//     the final `detect_intent_response`.
+// *   If the `StreamingDetectIntentRequest.query_input.audio` field was
+//     set, and the `StreamingDetectIntentRequest.enable_partial_response`
+//     field was false, the `recognition_result` field is populated for each
+//     of the (N-1) responses.
+//     See the [StreamingRecognitionResult][google.cloud.dialogflow.cx.v3beta1.StreamingRecognitionResult] message for details
+//     about the result message sequence.
+//
+// *   If the `StreamingDetectIntentRequest.enable_partial_response` field was
+//     true, the `detect_intent_response` field is populated for each
+//     of the (N-1) responses, where 1 <= N <= 4.
+//     These responses set the [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3beta1.DetectIntentResponse.response_type] field
+//     to `PARTIAL`.
+//
+// For the final Nth response message, the `detect_intent_response` is fully
+// populated, and [DetectIntentResponse.response_type][google.cloud.dialogflow.cx.v3beta1.DetectIntentResponse.response_type] is set to `FINAL`.
 message StreamingDetectIntentResponse {
   // The output response.
   oneof response {
@@ -291,35 +299,39 @@ message StreamingDetectIntentResponse {
 // that is currently being processed or an indication that this is the end
 // of the single requested utterance.
 //
-// Example:
-//
-// 1.  transcript: "tube"
-//
-// 2.  transcript: "to be a"
-//
-// 3.  transcript: "to be"
-//
-// 4.  transcript: "to be or not to be"
-//     is_final: true
-//
-// 5.  transcript: " that's"
-//
-// 6.  transcript: " that is"
-//
-// 7.  message_type: `END_OF_SINGLE_UTTERANCE`
+// While end-user audio is being processed, Dialogflow sends a series of
+// results. Each result may contain a `transcript` value. A transcript
+// represents a portion of the utterance. While the recognizer is processing
+// audio, transcript values may be interim values or finalized values.
+// Once a transcript is finalized, the `is_final` value is set to true and
+// processing continues for the next transcript.
 //
-// 8.  transcript: " that is the question"
-//     is_final: true
+// If `StreamingDetectIntentRequest.query_input.audio.config.single_utterance`
+// was true, and the recognizer has completed processing audio,
+// the `message_type` value is set to `END_OF_SINGLE_UTTERANCE and the
+// following (last) result contains the last finalized transcript.
 //
-// Only two of the responses contain final results (#4 and #8 indicated by
-// `is_final: true`). Concatenating these generates the full transcript: "to be
-// or not to be that is the question".
+// The complete end-user utterance is determined by concatenating the
+// finalized transcript values received for the series of results.
 //
-// In each response we populate:
+// In the following example, single utterance is enabled. In the case where
+// single utterance is not enabled, result 7 would not occur.
 //
-// *  for `TRANSCRIPT`: `transcript` and possibly `is_final`.
+// ```
+// Num | transcript              | message_type            | is_final
+// --- | ----------------------- | ----------------------- | --------
+// 1   | "tube"                  | TRANSCRIPT              | false
+// 2   | "to be a"               | TRANSCRIPT              | false
+// 3   | "to be"                 | TRANSCRIPT              | false
+// 4   | "to be or not to be"    | TRANSCRIPT              | true
+// 5   | "that's"                | TRANSCRIPT              | false
+// 6   | "that is                | TRANSCRIPT              | false
+// 7   | unset                   | END_OF_SINGLE_UTTERANCE | unset
+// 8   | " that is the question" | TRANSCRIPT              | true
+// ```
 //
-// *  for `END_OF_SINGLE_UTTERANCE`: only `message_type`.
+// Concatenating the finalized transcripts with `is_final` set to true,
+// the complete utterance becomes "to be or not to be that is the question".
 message StreamingRecognitionResult {
   // Type of the response message.
   enum MessageType {