Github user yew1eb commented on a diff in the pull request: https://github.com/apache/flink/pull/4826#discussion_r145370731 --- Diff: flink-streaming-java/src/main/java/org/apache/flink/streaming/util/latency/LatencyHistogram.java --- @@ -0,0 +1,51 @@ +/* + * 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.streaming.util.latency; + +import org.apache.flink.metrics.Histogram; +import org.apache.flink.metrics.HistogramStatistics; + +import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics; + +/** + * The {@link LatencyHistogram} use a DescriptiveStatistics {@link DescriptiveStatistics} as a Flink {@link Histogram}. + */ +public class LatencyHistogram implements org.apache.flink.metrics.Histogram { --- End diff -- make sense. But, the `org.apache.flink.streaming.runtime.streamrecord.LatencyMarker` in flink-streaming-java module, if `DescriptiveStatisticsHistogram` moved to flink-runtime, need add dependency flink-streaming-java for flink-runtime pom.xml.
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