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

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

    [ https://issues.apache.org/jira/browse/FLINK-15438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17006743#comment-17006743 ] 

Chesnay Schepler commented on FLINK-15438:
------------------------------------------

[~joern] I've assigned the issue to you. Your proposed solution sounds good to me.

> 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
>            Assignee: Jörn Kottmann
>            Priority: Minor
>
> 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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