Github user stoader commented on a diff in the pull request: https://github.com/apache/spark/pull/19775#discussion_r167359043 --- 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(); + + public static void write004(Writer writer, --- End diff -- Added doc.
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