Github user aljoscha commented on a diff in the pull request: https://github.com/apache/flink/pull/6292#discussion_r201352126 --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/metrics/util/InterceptingTaskMetricGroup.java --- @@ -0,0 +1,53 @@ +/* + * 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.flink.runtime.metrics.util; + +import org.apache.flink.metrics.Metric; +import org.apache.flink.runtime.metrics.groups.TaskMetricGroup; +import org.apache.flink.runtime.metrics.groups.UnregisteredMetricGroups; + +import java.util.HashMap; +import java.util.Map; + +/** + * A {@link TaskMetricGroup} that exposes all registered metrics. + */ +public class InterceptingTaskMetricGroup extends UnregisteredMetricGroups.UnregisteredTaskMetricGroup { + + private Map<String, Metric> intercepted; + + /** + * Returns the registered metric for the given name, or null if it was never registered. + * + * @param name metric name + * @return registered metric for the given name, or null if it was never registered + */ + public Metric get(String name) { + return intercepted.get(name); --- End diff -- this is also only for testing, right?
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