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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:
---------------------------------------

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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