Github user zentol commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3736#discussion_r112390678
  
    --- Diff: 
flink-metrics/flink-metrics-datadog/src/main/java/org/apache/flink/metrics/datadog/DatadogHttpReporter.java
 ---
    @@ -0,0 +1,214 @@
    +/*
    + * 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.metrics.datadog;
    +
    +import org.apache.flink.metrics.CharacterFilter;
    +import org.apache.flink.metrics.Counter;
    +import org.apache.flink.metrics.Gauge;
    +import org.apache.flink.metrics.Meter;
    +import org.apache.flink.metrics.Histogram;
    +import org.apache.flink.metrics.Metric;
    +import org.apache.flink.metrics.MetricConfig;
    +import org.apache.flink.metrics.MetricGroup;
    +import org.apache.flink.metrics.datadog.utils.SerializationUtils;
    +import org.apache.flink.metrics.reporter.MetricReporter;
    +import org.apache.flink.metrics.reporter.Scheduled;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.io.IOException;
    +import java.util.ArrayList;
    +import java.util.Arrays;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.concurrent.ConcurrentHashMap;
    +
    +
    +/**
    + * Metric Reporter for Datadog
    + *
    + * Variables in metrics scope will be sent to Datadog as tags
    + * */
    +public class DatadogHttpReporter implements MetricReporter, 
CharacterFilter, Scheduled {
    +   private static final Logger LOGGER = 
LoggerFactory.getLogger(DatadogHttpReporter.class);
    +
    +   // Both Flink's Gauge and Meter values are taken as gauge in Datadog
    +   private final Map<Gauge, DGauge> gauges = new ConcurrentHashMap<>();
    +   private final Map<Counter, DCounter> counters = new 
ConcurrentHashMap<>();
    +   private final Map<Meter, DMeter> meters = new ConcurrentHashMap<>();
    +
    +   private DatadogHttpClient client;
    +   private List<String> configTags;
    +
    +   public static final String API_KEY = "apikey";
    +   public static final String TAGS = "tags";
    +
    +   @Override
    +   public void notifyOfAddedMetric(Metric metric, String metricName, 
MetricGroup group) {
    +           final String name = group.getMetricIdentifier(metricName, this);
    +
    +           List<String> tags = new ArrayList<>(configTags);
    +           tags.addAll(getTagsFromMetricGroup(group));
    +
    +           synchronized (this) {
    +                   if (metric instanceof Counter) {
    +                           Counter c = (Counter) metric;
    +                           counters.put(c, new DCounter(c, name, tags));
    +                   } else if (metric instanceof Gauge) {
    +                           Gauge g = (Gauge) metric;
    +                           gauges.put(g, new DGauge(g, name, tags));
    --- End diff --
    
    In this case you should remove the gauge from the maps.


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