gianm commented on code in PR #18121:
URL: https://github.com/apache/druid/pull/18121#discussion_r2176852696


##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/MSQMetricUtils.java:
##########
@@ -0,0 +1,147 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+package org.apache.druid.msq.exec;
+
+import org.apache.druid.indexing.common.task.IndexTaskUtils;
+import org.apache.druid.indexing.common.task.Task;
+import org.apache.druid.java.util.emitter.service.ServiceMetricEvent;
+import org.apache.druid.msq.dart.controller.sql.DartSqlEngine;
+import org.apache.druid.msq.input.InputSpec;
+import org.apache.druid.msq.input.table.TableInputSpec;
+import org.apache.druid.msq.kernel.StageDefinition;
+import org.apache.druid.msq.sql.MSQTaskSqlEngine;
+import org.apache.druid.query.BaseQuery;
+import org.apache.druid.query.DefaultQueryMetrics;
+import org.apache.druid.query.DruidMetrics;
+import org.apache.druid.query.QueryContext;
+import org.joda.time.Interval;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Utility methods for setting up dimensions on metrics.
+ */
+public class MSQMetricUtils
+{
+  /**
+   * Sets dimensions for Dart queries, as well as some common dimensions. Sets 
the following dimensions:
+   * <ul>
+   * <li>queryId</li>
+   * <li>sqlQueryId</li>
+   * <li>type</li>
+   * <li>engine</li>
+   * </ul>
+   */
+  public static void setDartQueryIdDimensions(
+      final ServiceMetricEvent.Builder metricBuilder,
+      final QueryContext queryContext
+  )
+  {
+    setQueryIdDimensions(metricBuilder, queryContext);
+    metricBuilder.setDimension(DruidMetrics.ENGINE, DartSqlEngine.NAME);
+  }
+
+  /**
+   * Sets dimensions for MSQ task queries, as well as some common dimensions. 
Sets the following dimensions:
+   * <ul>
+   * <li>queryId</li>
+   * <li>sqlQueryId</li>
+   * <li>type</li>
+   * <li>engine</li>
+   * </ul>
+   */
+  public static void setTaskQueryIdDimensions(

Review Comment:
   Similar to the other one, how about calling this `setTaskDimensions`? Also, 
the javadoc isn't quite accurate, it's missing a few dimensions.



##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/MSQMetricUtils.java:
##########
@@ -0,0 +1,147 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+package org.apache.druid.msq.exec;
+
+import org.apache.druid.indexing.common.task.IndexTaskUtils;
+import org.apache.druid.indexing.common.task.Task;
+import org.apache.druid.java.util.emitter.service.ServiceMetricEvent;
+import org.apache.druid.msq.dart.controller.sql.DartSqlEngine;
+import org.apache.druid.msq.input.InputSpec;
+import org.apache.druid.msq.input.table.TableInputSpec;
+import org.apache.druid.msq.kernel.StageDefinition;
+import org.apache.druid.msq.sql.MSQTaskSqlEngine;
+import org.apache.druid.query.BaseQuery;
+import org.apache.druid.query.DefaultQueryMetrics;
+import org.apache.druid.query.DruidMetrics;
+import org.apache.druid.query.QueryContext;
+import org.joda.time.Interval;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Utility methods for setting up dimensions on metrics.
+ */
+public class MSQMetricUtils
+{
+  /**
+   * Sets dimensions for Dart queries, as well as some common dimensions. Sets 
the following dimensions:
+   * <ul>
+   * <li>queryId</li>
+   * <li>sqlQueryId</li>
+   * <li>type</li>
+   * <li>engine</li>
+   * </ul>
+   */
+  public static void setDartQueryIdDimensions(

Review Comment:
   The name of this method is a bit odd. It definitely sets more than the 
"query id dimensions". How about calling it `setDartDimensions`.



##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java:
##########
@@ -553,11 +554,31 @@ private MSQTaskReportPayload runInternal(final 
QueryListener queryListener, fina
         countersSnapshot,
         null
     );
-    // Emit summary metrics
+    // Emit metrics
+    emitQueryMetrics(queryDef, taskStateForReport.isSuccess());
     emitSummaryMetrics(msqTaskReportPayload, querySpec);
     return msqTaskReportPayload;
   }
 
+  private void emitQueryMetrics(@Nullable final QueryDefinition queryDef, 
final boolean success)
+  {
+    final Set<String> datasources = new HashSet<>();
+    final Set<Interval> intervals = new HashSet<>();
+    if (queryDef != null) {
+      for (StageDefinition stageDefinition : queryDef.getStageDefinitions()) {
+        datasources.addAll(MSQMetricUtils.getDatasources(stageDefinition));
+        intervals.addAll(MSQMetricUtils.getIntervals(stageDefinition));
+      }
+    }
+
+    long startTime = 
DateTimeUtils.getInstantMillis(MultiStageQueryContext.getStartTime(querySpec.getContext()));
+    context.emitMetric(
+        "query/time",
+        MSQMetricUtils.createQueryMetricDimensions(datasources, intervals, 
success),
+        startTime - System.currentTimeMillis()

Review Comment:
   This looks backwards.



##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/WorkerContext.java:
##########
@@ -56,6 +58,12 @@ public interface WorkerContext extends Closeable
   // Using an Injector directly because tasks do not have a way to provide 
their own Guice modules.
   Injector injector();
 
+  /**
+   * Emit a metric using a {@link ServiceEmitter}. The dimensions passed as an 
argument are also emitted with the
+   * metrics. These are can override any already existing context specific 
dimensions.
+   */
+  void emitMetric(String metric, Map<String, Object> overrideDimension, Number 
value);

Review Comment:
   `overrideDimensions` (spelling)



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