[jira] [Created] (FLINK-15438) Counter metrics are incorrectly reported as total counts to DataDog

[Shang Yuanchun (Jira)]

Jörn Kottmann created FLINK-15438:
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             Summary: Counter metrics are incorrectly reported as total counts to DataDog
                 Key: FLINK-15438
                 URL: https://issues.apache.org/jira/browse/FLINK-15438
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Metrics
    Affects Versions: 1.9.1
            Reporter: Jörn Kottmann


The Flink semantics of a counter are not matching with the counters in DataDog.

In Flink a counter counts the total of increment and decrement calls.
In DataDog a counter is a rate over the reporting interval.

The Flink implementation of the DataDog reporter seems to send the Flink counter value each time the metrics are reported. Correct would be to send the delta of the counter since the last report.

There are some features in DataDog which are easier to use if this could be fixed, e.g. alerts based on counters.



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