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https://issues.apache.org/jira/browse/FLINK-4812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16270597#comment-16270597
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ASF GitHub Bot commented on FLINK-4812:
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Github user zentol commented on the issue:
https://github.com/apache/flink/pull/5092
If we separate the watermark metric into in- and output metrics we can
simplify the the whole thing for sources. We can just intercept emitted
watermarks in the `Output` like we do for `numRecordsOut`, and re-use the same
gauge as the input for sources/assigners.
> 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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