[KAFKA-8696] Clean up Sum/Count/Total metrics - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Minor
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 2.4.0
Component/s: None
Labels:
None

Description

Kafka has a family of metrics consisting of:

org.apache.kafka.common.metrics.stats.Count
org.apache.kafka.common.metrics.stats.Sum
org.apache.kafka.common.metrics.stats.Total
org.apache.kafka.common.metrics.stats.Rate.SampledTotal
org.apache.kafka.streams.processor.internals.metrics.CumulativeCount
These metrics are all related to each other, but their relationship is obscure (and one is redundant) (and another is internal).

I've recently been involved in a third recapitulation of trying to work out which metric does what. It seems like it's time to clean up the mess and save everyone from having to work out the mystery for themselves.

I've proposed https://cwiki.apache.org/confluence/x/kkAyBw to fix it.