Github user zentol commented on the issue:
https://github.com/apache/flink/pull/2886
The reporter isn't closed and restarted; instead all metrics are being
de-registered and then re-registered. This is necessary since the ID of the TM
changes upon re-association with the JM.
It would make sense to only un-register the metrics after we associate with
a new JM; this should reduce the downtime of taskmanager metrics.
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