[KAFKA-3556] Improve group coordinator metrics - ASF JIRA

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Details

Type: Improvement
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: None
Labels:
None

Description

We currently don't have many metrics to track the behavior of the group coordinator (especially with respect to the new consumer). On a quick pass, I only saw a couple gauges in GroupMetadataManager for the number of groups and the number of cached offsets. Here are some interesting metrics that may be worth tracking:

1. Session timeout rate
2. Rebalance latency/rate
3. Commit latency/rate
4. Average group size
5. Size of metadata cache

Some of these may also be interesting to track per group.