Jason Gustafson created KAFKA-3556:
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Summary: Improve group coordinator metrics
Key: KAFKA-3556
URL: https://issues.apache.org/jira/browse/KAFKA-3556
Project: Kafka
Issue Type: Improvement
Reporter: Jason Gustafson
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.
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