Github user smurakozi commented on a diff in the pull request:
https://github.com/apache/spark/pull/19775#discussion_r166886232
--- 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,
+ Enumeration<Collector.MetricFamilySamples>
mfs)throws IOException {
+ write004(writer, mfs, null);
+ }
+
+ /**
+ * Write out the text version 0.0.4 of the given MetricFamilySamples.
+ */
+ public static void write004(Writer
writer,Enumeration<Collector.MetricFamilySamples> mfs,
+ String timestamp) throws IOException {
+ /* See http://prometheus.io/docs/instrumenting/exposition_formats/
+ * for the output format specification. */
+ while(mfs.hasMoreElements()) {
+ Collector.MetricFamilySamples metricFamilySamples =
mfs.nextElement();
--- End diff --
I think `for(Collector.MetricFamilySamples s: Collections.list(mfs)) {`
would be nicer.
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