jolshan commented on code in PR #14417:
URL: https://github.com/apache/kafka/pull/14417#discussion_r1348006202


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/metrics/CoordinatorRuntimeMetrics.java:
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@@ -0,0 +1,68 @@
+/*
+ * 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.kafka.coordinator.group.metrics;
+
+import 
org.apache.kafka.coordinator.group.runtime.CoordinatorRuntime.CoordinatorState;
+
+import java.util.function.Supplier;
+
+/**
+ * Used by the group and transaction coordinator runtimes, the metrics suite 
holds partition state gauges and sensors.
+ */
+public interface CoordinatorRuntimeMetrics extends AutoCloseable {
+
+    /**
+     * Called when the partition state changes.
+     * @param oldState The old state.
+     * @param newState The new state to transition to.
+     */
+    void recordPartitionStateChange(CoordinatorState oldState, 
CoordinatorState newState);
+
+    /**
+     * Record the partition load metric.
+     * @param startTimeMs The partition load start time.
+     * @param endTimeMs   The partition load end time.
+     */
+    void recordPartitionLoadSensor(long startTimeMs, long endTimeMs);
+
+    /**
+     * Update the event queue time.
+     *
+     * @param durationMs The queue time.
+     */
+    void recordEventQueueTime(long durationMs);
+
+    /**
+     * Update the event queue processing time.
+     *
+     * @param durationMs The event processing time.
+     */
+    void recordEventQueueProcessingTime(long durationMs);
+
+    /**
+     * Record the thread idle ratio.
+     * @param ratio The idle ratio.
+     */
+    void recordThreadIdleRatio(double ratio);
+
+    /**
+     * Register the event queue size gauge.
+     *
+     * @param sizeSupplier The size supplier.
+     */
+    void registerEventQueueSizeGauge(Supplier<Integer> sizeSupplier);

Review Comment:
   What is the event queue size gauge? And do we expect to see this called 
often or just once? 



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