KIP-471 — Expose RocksDB Metrics in Kafka Streams

Accepted Kafka 2.4 StreamsMetrics

Exposes RocksDB internal statistics (block cache hits, compaction stats, memtable metrics, etc.) as Kafka Streams JMX metrics via the existing metrics reporter infrastructure. RocksDB is the storage backend for stateful Streams operators, but its performance bottlenecks (cache pressure, write stalls) were invisible without attaching a separate JVM profiler or reading dump files.

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