[jira] [Created] (FLINK-39790) State latency/size tracking metrics not exported without sampling

["Efrat Levitan (Jira)" <ji...@apache.org>]

Efrat Levitan created FLINK-39790:
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             Summary: State latency/size tracking metrics not exported without sampling 
                 Key: FLINK-39790
                 URL: https://issues.apache.org/jira/browse/FLINK-39790
             Project: Flink
          Issue Type: Bug
          Components: Runtime / State Backends
    Affects Versions: 2.1.0
            Reporter: Efrat Levitan


h4. How to reproduce
{code:java}
state.*-track.keyed-state-enabled: true
state.*-track.sample-interval: 1
{code}
I think the latency/size tracking histogram metrics give a useful insight on the state operations. I noticed nothing is exported when setting sample-interval to 1, because for {{sampleInterval}} of 1, {{StateMetricBase#loopUpdateCounter}} will always return 0.
Enabling the metrics without sampling is probably not a great idea, and yet it looks like an edge case that could be handled (or documented).
[~hejufang001] what do you think? (I drafted a possible fix in https://github.com/apache/flink/pull/28257)



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