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

    https://github.com/apache/spark/pull/19775#discussion_r167359048
  
    --- Diff: 
core/src/main/java/org/apache/spark/metrics/prometheus/client/exporter/TextFormatWithTimestamp.java
 ---
    @@ -0,0 +1,178 @@
    +/*
    + * Licensed 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.spark.metrics.prometheus.client.exporter;
    +
    +import java.io.IOException;
    +import java.io.Writer;
    +import java.util.Enumeration;
    +
    +import io.prometheus.client.Collector;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +public class TextFormatWithTimestamp {
    +    private static final Logger logger = 
LoggerFactory.getLogger(TextFormatWithTimestamp.class);
    +
    +    /**
    +     * Content-type for text version 0.0.4.
    +     */
    +    public static final String CONTENT_TYPE_004 = "text/plain; 
version=0.0.4; charset=utf-8";
    +
    +    private static StringBuilder jsonMessageLogBuilder = new 
StringBuilder();
    --- End diff --
    
    This class has been refactored.


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