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Mason Chen commented on FLINK-30409: ------------------------------------ Another way to think about this is to "clear" underlying metric groups and metrics without "closing" the parent group so that metrics and underlying metric groups could be recreated. > Support reopening closed metric groups > -------------------------------------- > > Key: FLINK-30409 > URL: https://issues.apache.org/jira/browse/FLINK-30409 > Project: Flink > Issue Type: Improvement > Components: Runtime / Metrics > Affects Versions: 1.17.0 > Reporter: Mason Chen > Priority: Major > > Currently, metricGroup.close() will unregister metrics and the underlying > metric groups. If the metricGroup is created again via addGroup(), it will > silently fail to create metrics since the metric group is in a closed state. > We need to close metric groups and reopen them because some of the metrics > may reference old objects that are no longer relevant/stale and we need to > re-create the metric/metric group to point to the new references. For > example, we may close `KafkaSourceReader` to remove a topic partition from > assignment and then recreate `KafkaSourceReader` with a different set of > topic partitions. The metrics should also reflect that. -- This message was sent by Atlassian Jira (v8.20.10#820010)