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https://issues.apache.org/jira/browse/KAFKA-14868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17707796#comment-17707796
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hudeqi commented on KAFKA-14868:
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The problem of not closing the metric in the replicaManager has been solved in
the patch. As for how to improve the KafkaMetricsGroup to make the inspection
of such issues more general, there is no conclusive solution.
> Remove some forgotten metrics when the replicaManager is closed
> ---------------------------------------------------------------
>
> Key: KAFKA-14868
> URL: https://issues.apache.org/jira/browse/KAFKA-14868
> Project: Kafka
> Issue Type: Improvement
> Reporter: hudeqi
> Assignee: hudeqi
> Priority: Major
>
> In some current classes, some metrics are always registered when loading, but
> it often occurs that some or all metrics are forgotten to be removed when
> closing. For example, in the ReplicaManager class, IsrExpandsPerSec,
> IsrShrinksPerSec, and FailedIsrUpdatesPerSec are all removed by omission.
> Therefore, increase the counting capability in KafkaMetricsGroup. When using
> the method of KafkaMetricsGroup to add or remove a metric, it will add 1 to
> the corresponding counter, so that you can check whether there is a forgotten
> metric to be removed by counting and comparing in the unit test of the
> corresponding class.
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