[jira] [Closed] (FLINK-30409) Support reopening closed metric groups

["Xintong Song (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-30409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xintong Song closed FLINK-30409.
--------------------------------
    Fix Version/s: 1.17.0
       Resolution: Done

master (1.17): 535f02c72f3dfdedd4f40a30cc27364a5f5c2cdf

> 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
>            Assignee: Mason Chen
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.17.0
>
>
> 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.



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