[jira] [Created] (KAFKA-4838) Export buffer cache metrics in JMX

[Eno Thereska (JIRA)]

Eno Thereska created KAFKA-4838:
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             Summary: Export buffer cache metrics in JMX
                 Key: KAFKA-4838
                 URL: https://issues.apache.org/jira/browse/KAFKA-4838
             Project: Kafka
          Issue Type: Improvement
          Components: streams
    Affects Versions: 0.10.2.0
            Reporter: Eno Thereska
            Priority: Minor
             Fix For: 0.10.2.1


Currently we log certain cache metrics, but don't export those via JMX, e.g., 
in ThreadCache.flush() we have:
log.debug("Thread {} cache stats on flush: #puts={}, #gets={}, #evicts={}, 
#flushes={}",name, puts(), gets(), evicts(), flushes());

We should export the hits, misses etc as metrics (with a DEBUG recording 
level). 



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