[7.x] Add action to decommission legacy monitoring cluster alerts (#64373)

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/monitoring/action/MonitoringMigrateAlertsAction.java

@@ -0,0 +1,18 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.xpack.core.monitoring.action;
+
+import org.elasticsearch.action.ActionType;
+
+public class MonitoringMigrateAlertsAction extends ActionType<MonitoringMigrateAlertsResponse> {
+
+    public static final MonitoringMigrateAlertsAction INSTANCE = new MonitoringMigrateAlertsAction();
+    public static final String NAME = "cluster:admin/xpack/monitoring/migrate/alerts";
+
+    public MonitoringMigrateAlertsAction() {
+        super(NAME, MonitoringMigrateAlertsResponse::new);
+    }
+}

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/monitoring/action/MonitoringMigrateAlertsRequest.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+package org.elasticsearch.xpack.core.monitoring.action;
+
+import org.elasticsearch.action.ActionRequestValidationException;
+import org.elasticsearch.action.support.master.MasterNodeRequest;
+import org.elasticsearch.common.io.stream.StreamInput;
+
+import java.io.IOException;
+
+public class MonitoringMigrateAlertsRequest extends MasterNodeRequest<MonitoringMigrateAlertsRequest> {
+
+    public MonitoringMigrateAlertsRequest() {}
+
+    public MonitoringMigrateAlertsRequest(StreamInput in) throws IOException {
+        super(in);
+    }
+
+    @Override
+    public ActionRequestValidationException validate() {
+        return null;
+    }
+}

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/monitoring/action/MonitoringMigrateAlertsResponse.java

@@ -0,0 +1,159 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+package org.elasticsearch.xpack.core.monitoring.action;
+
+import org.elasticsearch.ElasticsearchException;
+import org.elasticsearch.action.ActionResponse;
+import org.elasticsearch.common.Nullable;
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.StreamOutput;
+import org.elasticsearch.common.io.stream.Writeable;
+import org.elasticsearch.common.xcontent.ToXContent;
+import org.elasticsearch.common.xcontent.ToXContentObject;
+import org.elasticsearch.common.xcontent.XContentBuilder;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Objects;
+
+public class MonitoringMigrateAlertsResponse extends ActionResponse implements ToXContentObject {
+
+    private final List<ExporterMigrationResult> exporters;
+
+    public MonitoringMigrateAlertsResponse(List<ExporterMigrationResult> exporters) {
+        this.exporters = exporters;
+    }
+
+    public MonitoringMigrateAlertsResponse(StreamInput in) throws IOException {
+        super(in);
+        this.exporters = in.readList(ExporterMigrationResult::new);
+    }
+
+    @Override
+    public void writeTo(StreamOutput out) throws IOException {
+        out.writeList(exporters);
+    }
+
+    @Override
+    public XContentBuilder toXContent(XContentBuilder builder, ToXContent.Params params) throws IOException {
+        return builder.startObject()
+            .array("exporters", exporters)
+            .endObject();
+    }
+
+    public List<ExporterMigrationResult> getExporters() {
+        return exporters;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        MonitoringMigrateAlertsResponse response = (MonitoringMigrateAlertsResponse) o;
+        return Objects.equals(exporters, response.exporters);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(exporters);
+    }
+
+    @Override
+    public String toString() {
+        return "MonitoringMigrateAlertsResponse{" +
+            "exporters=" + exporters +
+            '}';
+    }
+
+    public static class ExporterMigrationResult implements Writeable, ToXContentObject {
+
+        private final String name;
+        private final String type;
+        private final boolean migrationComplete;
+        private final Exception reason;
+
+        public ExporterMigrationResult(String name, String type, boolean migrationComplete, Exception reason) {
+            this.name = name;
+            this.type = type;
+            this.migrationComplete = migrationComplete;
+            this.reason = reason;
+        }
+
+        public ExporterMigrationResult(StreamInput in) throws IOException {
+            this.name = in.readString();
+            this.type = in.readString();
+            this.migrationComplete = in.readBoolean();
+            this.reason = in.readException();
+        }
+
+        @Override
+        public void writeTo(StreamOutput out) throws IOException {
+            out.writeString(name);
+            out.writeString(type);
+            out.writeBoolean(migrationComplete);
+            out.writeException(reason);
+        }
+
+        @Override
+        public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
+            builder.startObject();
+            {
+                builder.field("name", name);
+                builder.field("type", type);
+                builder.field("migration_complete", migrationComplete);
+                if (reason != null) {
+                    builder.startObject("reason");
+                    ElasticsearchException.generateThrowableXContent(builder, params, reason);
+                    builder.endObject();
+                }
+            }
+            return builder.endObject();
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public String getType() {
+            return type;
+        }
+
+        public boolean isMigrationComplete() {
+            return migrationComplete;
+        }
+
+        @Nullable
+        public Exception getReason() {
+            return reason;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            ExporterMigrationResult that = (ExporterMigrationResult) o;
+            return migrationComplete == that.migrationComplete &&
+                Objects.equals(name, that.name) &&
+                Objects.equals(type, that.type);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(name, type, migrationComplete);
+        }
+
+        @Override
+        public String toString() {
+            return "ExporterMigrationResult{" +
+                "name='" + name + '\'' +
+                ", type='" + type + '\'' +
+                ", migrationComplete=" + migrationComplete +
+                ", reason=" + reason +
+                '}';
+        }
+    }
+}

x-pack/plugin/monitoring/src/internalClusterTest/java/org/elasticsearch/xpack/monitoring/exporter/http/HttpExporterIT.java

@@ -52,6 +52,7 @@
 import org.elasticsearch.xpack.monitoring.exporter.ClusterAlertsUtil;
 import org.elasticsearch.xpack.monitoring.exporter.ExportBulk;
 import org.elasticsearch.xpack.monitoring.exporter.Exporter;
+import org.elasticsearch.xpack.monitoring.exporter.MonitoringMigrationCoordinator;
 import org.elasticsearch.xpack.monitoring.test.MonitoringIntegTestCase;
 import org.junit.After;
 import org.junit.Before;
@@ -99,6 +100,7 @@ public class HttpExporterIT extends MonitoringIntegTestCase {
     private final boolean watcherAlreadyExists = randomBoolean();
     private final Environment environment = TestEnvironment.newEnvironment(Settings.builder().put("path.home", createTempDir()).build());
     private final String userName = "elasticuser";
+    private final MonitoringMigrationCoordinator coordinator = new MonitoringMigrationCoordinator();
 
     private MockWebServer webServer;
 
@@ -651,7 +653,7 @@ private HttpExporter createHttpExporter(final Settings settings) {
         final Exporter.Config config =
                 new Exporter.Config("_http", "http", settings, clusterService(), TestUtils.newTestLicenseState());
 
-        return new HttpExporter(config, new SSLService(settings, environment), new ThreadContext(settings));
+        return new HttpExporter(config, new SSLService(settings, environment), new ThreadContext(settings), coordinator);
     }
 
     private void export(final Settings settings, final Collection<MonitoringDoc> docs) throws Exception {

x-pack/plugin/monitoring/src/main/java/org/elasticsearch/xpack/monitoring/Monitoring.java

@@ -36,8 +36,10 @@
 import org.elasticsearch.xpack.core.XPackPlugin;
 import org.elasticsearch.xpack.core.monitoring.MonitoringField;
 import org.elasticsearch.xpack.core.monitoring.action.MonitoringBulkAction;
+import org.elasticsearch.xpack.core.monitoring.action.MonitoringMigrateAlertsAction;
 import org.elasticsearch.xpack.core.ssl.SSLService;
 import org.elasticsearch.xpack.monitoring.action.TransportMonitoringBulkAction;
+import org.elasticsearch.xpack.monitoring.action.TransportMonitoringMigrateAlertsAction;
 import org.elasticsearch.xpack.monitoring.cleaner.CleanerService;
 import org.elasticsearch.xpack.monitoring.collector.Collector;
 import org.elasticsearch.xpack.monitoring.collector.ccr.StatsCollector;
@@ -50,9 +52,11 @@
 import org.elasticsearch.xpack.monitoring.collector.shards.ShardsCollector;
 import org.elasticsearch.xpack.monitoring.exporter.Exporter;
 import org.elasticsearch.xpack.monitoring.exporter.Exporters;
+import org.elasticsearch.xpack.monitoring.exporter.MonitoringMigrationCoordinator;
 import org.elasticsearch.xpack.monitoring.exporter.http.HttpExporter;
 import org.elasticsearch.xpack.monitoring.exporter.local.LocalExporter;
 import org.elasticsearch.xpack.monitoring.rest.action.RestMonitoringBulkAction;
+import org.elasticsearch.xpack.monitoring.rest.action.RestMonitoringMigrateAlertsAction;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -65,7 +69,6 @@
 import java.util.Set;
 import java.util.function.Supplier;
 
-import static java.util.Collections.singletonList;
 import static org.elasticsearch.common.settings.Setting.boolSetting;
 
 /**
@@ -127,10 +130,12 @@ public Collection<Object> createComponents(Client client, ClusterService cluster
         final ClusterSettings clusterSettings = clusterService.getClusterSettings();
         final CleanerService cleanerService = new CleanerService(settings, clusterSettings, threadPool, getLicenseState());
         final SSLService dynamicSSLService = getSslService().createDynamicSSLService();
+        final MonitoringMigrationCoordinator migrationCoordinator = new MonitoringMigrationCoordinator();
 
         Map<String, Exporter.Factory> exporterFactories = new HashMap<>();
-        exporterFactories.put(HttpExporter.TYPE, config -> new HttpExporter(config, dynamicSSLService, threadPool.getThreadContext()));
-        exporterFactories.put(LocalExporter.TYPE, config -> new LocalExporter(config, client, cleanerService));
+        exporterFactories.put(HttpExporter.TYPE, config -> new HttpExporter(config, dynamicSSLService, threadPool.getThreadContext(),
+            migrationCoordinator));
+        exporterFactories.put(LocalExporter.TYPE, config -> new LocalExporter(config, client, migrationCoordinator, cleanerService));
         exporters = new Exporters(settings, exporterFactories, clusterService, getLicenseState(), threadPool.getThreadContext(),
             dynamicSSLService);
 
@@ -147,27 +152,29 @@ public Collection<Object> createComponents(Client client, ClusterService cluster
 
         final MonitoringService monitoringService = new MonitoringService(settings, clusterService, threadPool, collectors, exporters);
 
-        return Arrays.asList(monitoringService, exporters, cleanerService);
+        return Arrays.asList(monitoringService, exporters, migrationCoordinator, cleanerService);
     }
 
     @Override
     public List<ActionHandler<? extends ActionRequest, ? extends ActionResponse>> getActions() {
-        return singletonList(new ActionHandler<>(MonitoringBulkAction.INSTANCE, TransportMonitoringBulkAction.class));
+        return Arrays.asList(
+            new ActionHandler<>(MonitoringBulkAction.INSTANCE, TransportMonitoringBulkAction.class),
+            new ActionHandler<>(MonitoringMigrateAlertsAction.INSTANCE, TransportMonitoringMigrateAlertsAction.class)
+        );
     }
 
     @Override
     public List<RestHandler> getRestHandlers(Settings settings, RestController restController, ClusterSettings clusterSettings,
             IndexScopedSettings indexScopedSettings, SettingsFilter settingsFilter, IndexNameExpressionResolver indexNameExpressionResolver,
             Supplier<DiscoveryNodes> nodesInCluster) {
-        return singletonList(new RestMonitoringBulkAction());
+        return Arrays.asList(new RestMonitoringBulkAction(), new RestMonitoringMigrateAlertsAction());
     }
 
     @Override
     public List<Setting<?>> getSettings() {
         List<Setting<?>> settings = new ArrayList<>();
         settings.add(MonitoringField.HISTORY_DURATION);
         settings.add(CLEAN_WATCHER_HISTORY);
-        settings.add(MIGRATION_DECOMMISSION_ALERTS);
         settings.add(MonitoringService.ENABLED);
         settings.add(MonitoringService.ELASTICSEARCH_COLLECTION_ENABLED);
         settings.add(MonitoringService.INTERVAL);
@@ -181,6 +188,7 @@ public List<Setting<?>> getSettings() {
         settings.add(NodeStatsCollector.NODE_STATS_TIMEOUT);
         settings.add(EnrichStatsCollector.STATS_TIMEOUT);
         settings.addAll(Exporters.getSettings());
+        settings.add(Monitoring.MIGRATION_DECOMMISSION_ALERTS);
         return Collections.unmodifiableList(settings);
     }