[jira] [Created] (FLINK-28516) UI is misleading when source doesn't emit watermark due to misconfigured idleness

["Chesnay Schepler (Jira)" <ji...@apache.org>]

Chesnay Schepler created FLINK-28516:
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             Summary: UI is misleading when source doesn't emit watermark due to misconfigured idleness
                 Key: FLINK-28516
                 URL: https://issues.apache.org/jira/browse/FLINK-28516
             Project: Flink
          Issue Type: Bug
          Components: Connectors / Common, Runtime / Web Frontend
            Reporter: Chesnay Schepler
             Fix For: 1.16.0


When a source is not emitting watermarks because one of the readers is idle, without idleness being set up, then the UI display this in the watermarks tab:
{code:java}
No Watermark (Watermarks are only available if EventTime is used) {code}
My immediate interpretation was that event time was not used by my job. I understand the intention behind the event time remark, but it reads to much as a reason as to why there is no watermark in the current job.

This could be improved by either storing a flag in the job graph for whether event time is properly set up, or enhancing the watermarks tab to also show output watermarks for sources.



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