[jira] [Created] (SAMZA-1907) Add metrics to monitor Watermarks

[Xinyu Liu (JIRA)]

Xinyu Liu created SAMZA-1907:
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             Summary: Add metrics to monitor Watermarks
                 Key: SAMZA-1907
                 URL: https://issues.apache.org/jira/browse/SAMZA-1907
             Project: Samza
          Issue Type: Improvement
            Reporter: Xinyu Liu
            Assignee: Xinyu Liu


Add initial metric to monitor the aggregated watermark time. Will add more if 
needed in the future.



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