anuragrai16 opened a new pull request, #19529:
URL: https://github.com/apache/pinot/pull/19529
Expose the concrete `StreamMessageDecoder` class of a consuming realtime
segment for debugging decode issues:
- New `CONSUMING_SEGMENT_DECODER` server gauge, tagged by table/topic/
partition/decoder class, emitted alongside `LLC_PARTITION_CONSUMING` and
removed on segment offload.
- Persist the decoder class in segment metadata (custom.decoder.class) and
surface decoderClassName via the consuming-segment debug APIs.
- Add a JMX->Prometheus scrape rule for the new gauge.
**Backward compatible:** SPI addition is a nullable default method, the DTO
field is nullable with ignore-unknown, segment metadata is additive, and the
scrape rule is anchored to avoid shadowing existing rules.
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