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https://issues.apache.org/jira/browse/FLINK-4812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16271100#comment-16271100
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ASF GitHub Bot commented on FLINK-4812:
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Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/5100
I think the fact the the operator needs this in `setup()` is already
problematic, the latency metrics implementation shouldn't have been merged like
this. Wouldn't we need the output gauge only in `OperatorChain` because that
creates the `Output`s that operators use to emit watermarks?
> 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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