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https://issues.apache.org/jira/browse/FLINK-3427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953644#comment-15953644
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Chesnay Schepler commented on FLINK-3427:
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[~vpernin] The backpressure monitoring should still be done through the REST
API or the backpressure tab in the web-frontend. The "status" of the REST
response is "deprecated" if this query caused the backpressure sampling to be
started. Since this takes a bit the last, and as such outdated, backpressure
information, will be returned.
> Add watermark monitoring to JobManager web frontend
> ---------------------------------------------------
>
> Key: FLINK-3427
> URL: https://issues.apache.org/jira/browse/FLINK-3427
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API, Webfrontend
> Reporter: Robert Metzger
> Fix For: 1.3.0
>
>
> Currently, its quite hard to figure out issues with the watermarks.
> I think we can improve the situation by reporting the following information
> through the metrics system:
> - Report the current low watermark for each operator (this way, you can see
> if one operator is preventing the watermarks to rise)
> - Report the number of events arrived after the low watermark (users can see
> how accurate the watermarks are)
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