[jira] [Created] (KAFKA-9327) GroupMetadata metrics are not documented

[Gwen Shapira (Jira)]

Gwen Shapira created KAFKA-9327:
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             Summary: GroupMetadata metrics are not documented
                 Key: KAFKA-9327
                 URL: https://issues.apache.org/jira/browse/KAFKA-9327
             Project: Kafka
          Issue Type: Improvement
            Reporter: Gwen Shapira


GroupMetadataManager includes quite a few gauges that look very useful! 
NumGroups, NumGroupsPreparingRebalance, NumGroupsStable, NumGroupsDead, 
NumGroupsEmpty.

I couldn't find them in our site-docs, but they seem quite useful and will be 
nice to include. 

LastStableOffsetLag is also missing, but I'm not sure if it is useful enough to 
include.



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