Github user zjureel commented on the issue:
https://github.com/apache/flink/pull/4307
@zentol Thank you for your review, I have fix the problems you metioned as
follows:
1. rename `TaskExecutorMetricsInitializer` to `MetricUtils`
2. move `taskManagerMetricGroup.close()` from `disassociateFromJobManager`
to `postStop`, I think the it's neccessary to close `taskManagerMetricGroup`
manually
Please have another look when you are free, thanks
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