KIP-104 — Granular Sensors for Streams

Accepted Kafka 1.0 StreamsMetrics

KIP-104 adds per-processor-node latency and throughput metrics and per-task record count metrics to Kafka Streams at `DEBUG` recording level, togglable via `metrics.record.level`. Existing Streams metrics only provided aggregate global rates, making it impossible to identify which processor node in a topology was a performance bottleneck.

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