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https://issues.apache.org/jira/browse/KAFKA-6514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16356321#comment-16356321
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Ismael Juma commented on KAFKA-6514:
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[~allenxwang], the tags are part of the name in JMX and hence it would be a
breaking change for anyone using the JmxReporter (which is enabled by default).
If there are good arguments to break such uses, it can be considered as part of
the KIP discussion.
If search for "metric", you can find a few KIPs that were posted for adding or
updating existing metrics:
[https://cwiki.apache.org/confluence/display/KAFKA/Kafka+Improvement+Proposals]
> Add API version as a tag for the RequestsPerSec metric
> ------------------------------------------------------
>
> Key: KAFKA-6514
> URL: https://issues.apache.org/jira/browse/KAFKA-6514
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.0.0
> Reporter: Allen Wang
> Priority: Major
>
> After we upgrade broker to a new version, one important insight is to see how
> many clients have been upgraded so that we can switch the message format when
> most of the clients have also been updated to the new version to minimize the
> performance penalty.
> RequestsPerSec with the version tag will give us that insight.
>
>
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