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https://issues.apache.org/jira/browse/FLINK-4812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16270520#comment-16270520
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ASF GitHub Bot commented on FLINK-4812:
---------------------------------------
Github user tzulitai commented on a diff in the pull request:
https://github.com/apache/flink/pull/5092#discussion_r153737439
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/metrics/WatermarkGauge.java
---
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.flink.streaming.runtime.metrics;
+
+import org.apache.flink.metrics.Gauge;
+
+/**
+ * A {@link Gauge} for exposing the current low watermark.
+ */
+public class WatermarkGauge implements Gauge<Long> {
+
+ private long currentLowWatermark = Long.MIN_VALUE;
+
+ public void setCurrentLowWatermark(long watermark) {
+ this.currentLowWatermark = watermark;
--- End diff --
Looking solely at this class alone, I wonder if we should add verification
logic here that the set low watermark is ascending.
> Report Watermark metrics in all operators
> -----------------------------------------
>
> Key: FLINK-4812
> URL: https://issues.apache.org/jira/browse/FLINK-4812
> Project: Flink
> Issue Type: Improvement
> Components: Metrics
> Reporter: Robert Metzger
> Assignee: Chesnay Schepler
> Priority: Critical
> Fix For: 1.5.0
>
>
> As reported by a user, Flink does currently not export the current low
> watermark for sources
> (http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/currentLowWatermark-metric-not-reported-for-all-tasks-td13770.html).
> This JIRA is for adding such a metric for the sources as well.
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