FrankYang0529 opened a new pull request, #15502:
URL: https://github.com/apache/kafka/pull/15502

   The `MessageConversionsTimeMs` is calculated by `Math.round` before updating 
metrics, so it could be zero if it run too fast.
   
   Modify updating logic as only updating metrics if `messageConversionsTimeMs` 
is greater than 0.
   
   Modify unit test to check whether the metric is updated.
   
   I run the test 100 times and there is no flaky result.
   
   ```
   I=1; while [ $I -le 100 ] && ./gradlew cleanTest core:test --tests 
MetricsTest.testMetrics; do echo "Completed run: $I"; (( I=$I+1 )); sleep 1; 
done
   ```
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   


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