[PR] KAFKA-15894: Fix messageConversionsTimeNanos and temporaryMemoryBytes not accumulated across partitions [kafka]

["majialoong (via GitHub)" <gi...@apache.org>]

majialoong opened a new pull request, #21420:
URL: https://github.com/apache/kafka/pull/21420

   In `KafkaApis.updateRecordConversionStats`, `request.messageConversionsTimeNanos` and `request.temporaryMemoryBytes` were assigned with `=` instead of `+=`. When a produce request spans multiple partitions, `processingStatsCallback` calls this method once per partition, causing earlier values to be overwritten. Only the last partition's stats were recorded.
   
   This PR changes `=` to `+=` so that the metrics are correctly accumulated, and adds a unit test covering the multi-partition scenario.


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Re: [PR] KAFKA-15894: Fix messageConversionsTimeNanos and temporaryMemoryBytes not accumulated across partitions [kafka]

["chia7712 (via GitHub)" <gi...@apache.org>]

chia7712 merged PR #21420:
URL: https://github.com/apache/kafka/pull/21420


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