diff --git a/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/stub/GrpcTraceServiceStub.java b/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/stub/GrpcTraceServiceStub.java
index 3697f843edfb..f788a3948a67 100644
--- a/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/stub/GrpcTraceServiceStub.java
+++ b/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/stub/GrpcTraceServiceStub.java
@@ -23,7 +23,9 @@
 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.RequestParamsExtractor;
 import com.google.api.gax.rpc.UnaryCallable;
+import com.google.common.collect.ImmutableMap;
 import com.google.devtools.cloudtrace.v1.GetTraceRequest;
 import com.google.devtools.cloudtrace.v1.ListTracesRequest;
 import com.google.devtools.cloudtrace.v1.ListTracesResponse;
@@ -33,6 +35,7 @@
 import io.grpc.MethodDescriptor;
 import io.grpc.protobuf.ProtoUtils;
 import java.io.IOException;
+import java.util.Map;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Generated;
 
@@ -118,6 +121,15 @@ protected GrpcTraceServiceStub(
     GrpcCallSettings<PatchTracesRequest, Empty> patchTracesTransportSettings =
         GrpcCallSettings.<PatchTracesRequest, Empty>newBuilder()
             .setMethodDescriptor(patchTracesMethodDescriptor)
+            .setParamsExtractor(
+                new RequestParamsExtractor<PatchTracesRequest>() {
+                  @Override
+                  public Map<String, String> extract(PatchTracesRequest request) {
+                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                    params.put("project_id", String.valueOf(request.getProjectId()));
+                    return params.build();
+                  }
+                })
             .build();
     GrpcCallSettings<GetTraceRequest, Trace> getTraceTransportSettings =
         GrpcCallSettings.<GetTraceRequest, Trace>newBuilder()
@@ -126,6 +138,15 @@ protected GrpcTraceServiceStub(
     GrpcCallSettings<ListTracesRequest, ListTracesResponse> listTracesTransportSettings =
         GrpcCallSettings.<ListTracesRequest, ListTracesResponse>newBuilder()
             .setMethodDescriptor(listTracesMethodDescriptor)
+            .setParamsExtractor(
+                new RequestParamsExtractor<ListTracesRequest>() {
+                  @Override
+                  public Map<String, String> extract(ListTracesRequest request) {
+                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                    params.put("project_id", String.valueOf(request.getProjectId()));
+                    return params.build();
+                  }
+                })
             .build();
 
     this.patchTracesCallable =
diff --git a/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v2/stub/GrpcTraceServiceStub.java b/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v2/stub/GrpcTraceServiceStub.java
index efc2187e243e..e7f5b5cd60fd 100644
--- a/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v2/stub/GrpcTraceServiceStub.java
+++ b/google-cloud-clients/google-cloud-trace/src/main/java/com/google/cloud/trace/v2/stub/GrpcTraceServiceStub.java
@@ -21,13 +21,16 @@
 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.RequestParamsExtractor;
 import com.google.api.gax.rpc.UnaryCallable;
+import com.google.common.collect.ImmutableMap;
 import com.google.devtools.cloudtrace.v2.BatchWriteSpansRequest;
 import com.google.devtools.cloudtrace.v2.Span;
 import com.google.protobuf.Empty;
 import io.grpc.MethodDescriptor;
 import io.grpc.protobuf.ProtoUtils;
 import java.io.IOException;
+import java.util.Map;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Generated;
 
@@ -105,10 +108,28 @@ protected GrpcTraceServiceStub(
     GrpcCallSettings<BatchWriteSpansRequest, Empty> batchWriteSpansTransportSettings =
         GrpcCallSettings.<BatchWriteSpansRequest, Empty>newBuilder()
             .setMethodDescriptor(batchWriteSpansMethodDescriptor)
+            .setParamsExtractor(
+                new RequestParamsExtractor<BatchWriteSpansRequest>() {
+                  @Override
+                  public Map<String, String> extract(BatchWriteSpansRequest request) {
+                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                    params.put("name", String.valueOf(request.getName()));
+                    return params.build();
+                  }
+                })
             .build();
     GrpcCallSettings<Span, Span> createSpanTransportSettings =
         GrpcCallSettings.<Span, Span>newBuilder()
             .setMethodDescriptor(createSpanMethodDescriptor)
+            .setParamsExtractor(
+                new RequestParamsExtractor<Span>() {
+                  @Override
+                  public Map<String, String> extract(Span request) {
+                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                    params.put("name", String.valueOf(request.getName()));
+                    return params.build();
+                  }
+                })
             .build();
 
     this.batchWriteSpansCallable =
diff --git a/google-cloud-clients/google-cloud-trace/synth.metadata b/google-cloud-clients/google-cloud-trace/synth.metadata
index eadc17f8146d..2a460ece0251 100644
--- a/google-cloud-clients/google-cloud-trace/synth.metadata
+++ b/google-cloud-clients/google-cloud-trace/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-03-06T08:55:06.586413Z",
+  "updateTime": "2019-03-28T07:59:19.919927Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.15",
-        "dockerImage": "googleapis/artman@sha256:9caadfa59d48224cba5f3217eb9d61a155b78ccf31e628abef385bc5b7ed3bd2"
+        "version": "0.16.20",
+        "dockerImage": "googleapis/artman@sha256:e3c054a2fb85a12481c722af616c7fb6f1d02d862248385eecbec3e4240ebd1e"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "856117505ff9075b3e9c0b5674113667b6cf9e00",
-        "internalRef": "236931378"
+        "sha": "6a84b3267b0a95e922608b9891219075047eee29",
+        "internalRef": "240640999"
       }
     }
   ],