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https://issues.apache.org/jira/browse/FLINK-40549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18112277#comment-18112277
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Piotr Nowojski commented on FLINK-40549:
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merged commit 7fcc6b8 and 7fcc6b8^ into apache:master
> Split level metrics leak the closed metricGroup on split finish
> ---------------------------------------------------------------
>
> Key: FLINK-40549
> URL: https://issues.apache.org/jira/browse/FLINK-40549
> Project: Flink
> Issue Type: Bug
> Reporter: Efrat Levitan
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.4.0
>
>
> Today there's no API to deregister child metric groups added via
> {{{}MetricGroup#addGroup{}}}. This is not a problem as long as child metric
> groups are permanent through parent lifecycle.
> For split level metric group this is a problem because they might not live as
> long as the source (aka splitFinished). As a result we are left with a closed
> child metric group reference on the parent, preventing the object GC.
>
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