[GitHub] flink pull request #5857: [FLINK-9187][METRICS] add prometheus pushgateway r...

[zentol <gi...@git.apache.org>]

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

    https://github.com/apache/flink/pull/5857#discussion_r191174704
  
    --- Diff: flink-metrics/flink-metrics-prometheus/src/main/java/org/apache/flink/metrics/prometheus/AbstractPrometheusReporter.java ---
    @@ -0,0 +1,283 @@
    +/*
    + * 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.prometheus;
    +
    +import org.apache.flink.annotation.PublicEvolving;
    +import org.apache.flink.annotation.VisibleForTesting;
    +import org.apache.flink.metrics.CharacterFilter;
    +import org.apache.flink.metrics.Counter;
    +import org.apache.flink.metrics.Gauge;
    +import org.apache.flink.metrics.Histogram;
    +import org.apache.flink.metrics.Meter;
    +import org.apache.flink.metrics.Metric;
    +import org.apache.flink.metrics.MetricConfig;
    +import org.apache.flink.metrics.MetricGroup;
    +import org.apache.flink.metrics.reporter.MetricReporter;
    +import org.apache.flink.runtime.metrics.groups.AbstractMetricGroup;
    +import org.apache.flink.runtime.metrics.groups.FrontMetricGroup;
    +
    +import io.prometheus.client.Collector;
    +import io.prometheus.client.CollectorRegistry;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.util.AbstractMap;
    +import java.util.ArrayList;
    +import java.util.Arrays;
    +import java.util.Collections;
    +import java.util.HashMap;
    +import java.util.LinkedList;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.regex.Pattern;
    +
    +
    +/**
    + * base prometheus reporter for prometheus metrics.
    + */
    +@PublicEvolving
    +public abstract class AbstractPrometheusReporter implements MetricReporter {
    +
    +	private static final Logger LOG = LoggerFactory.getLogger(AbstractPrometheusReporter.class);
    --- End diff --
    
    it is a bit icky to have a separate loggers in the base and sub classes. Define the logger as below instead and update all logger usages.
    ```
    protected final Logger log = LoggerFactory.getLogger(getClass());
    ```


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