Github user smurakozi commented on a diff in the pull request:
https://github.com/apache/spark/pull/19775#discussion_r166886839
--- 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();
+
+ logger.debug("Metrics data");
+ logger.debug(metricFamilySamples.toString());
+ logger.debug("Logging metrics as a json format:");
+
+
+ writer.write("# HELP ");
+ appendToJsonMessageLogBuilder("# HELP ");
+ writer.write(metricFamilySamples.name);
+ appendToJsonMessageLogBuilder(metricFamilySamples.name);
+ writer.write(' ');
+ appendToJsonMessageLogBuilder(' ');
+ writeEscapedHelp(writer, metricFamilySamples.help);
+ writer.write('\n');
+ appendToJsonMessageLogBuilder('\n');
+
+ writer.write("# TYPE ");
+ appendToJsonMessageLogBuilder("# TYPE ");
+ writer.write(metricFamilySamples.name);
+ appendToJsonMessageLogBuilder(metricFamilySamples.name);
+ writer.write(' ');
+ appendToJsonMessageLogBuilder(' ');
+ writer.write(typeString(metricFamilySamples.type));
+
appendToJsonMessageLogBuilder(typeString(metricFamilySamples.type));
+ writer.write('\n');
+ appendToJsonMessageLogBuilder('\n');
+
+ for (Collector.MetricFamilySamples.Sample sample:
metricFamilySamples.samples) {
+ writer.write(sample.name);
+ appendToJsonMessageLogBuilder(sample.name);
+ if (sample.labelNames.size() > 0) {
+ writer.write('{');
+ appendToJsonMessageLogBuilder('{');
+ for (int i = 0; i < sample.labelNames.size(); ++i) {
+ writer.write(sample.labelNames.get(i));
+
appendToJsonMessageLogBuilder(sample.labelNames.get(i));
+ writer.write("=\"");
+ appendToJsonMessageLogBuilder("=\"");
+ writeEscapedLabelValue(writer,
sample.labelValues.get(i));
+ writer.write("\",");
+ appendToJsonMessageLogBuilder("\",");
+ }
+ writer.write('}');
+ appendToJsonMessageLogBuilder('}');
+ }
+ writer.write(' ');
+ appendToJsonMessageLogBuilder(' ');
+ writer.write(Collector.doubleToGoString(sample.value));
+
appendToJsonMessageLogBuilder(Collector.doubleToGoString(sample.value));
+ if(timestamp != null && !timestamp.isEmpty()) {
+ writer.write(" " + timestamp);
+ appendToJsonMessageLogBuilder(" " + timestamp);
+ }
+ writer.write('\n');
+ appendToJsonMessageLogBuilder('\n');
+ }
+ logger.debug("JSON: "+ jsonMessageLogBuilder);
+ }
+ }
+
+ private static void writeEscapedHelp(Writer writer, String s) throws
IOException {
+ for (int i = 0; i < s.length(); i++) {
+ char c = s.charAt(i);
+ switch (c) {
+ case '\\':
+
--- End diff --
Nit: empty line
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