[KAFKA-3556] Improve group coordinator metrics

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Assignee: Liquan Pei
• Reporter: Jason Gustafson
• Created: 14/Apr/16 00:52
• Updated: 30/Jul/19 00:13

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.

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