Github user stoader commented on a diff in the pull request:
https://github.com/apache/spark/pull/19775#discussion_r167359056
--- 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 {
--- End diff --
Added doc.
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