KIP-414 — Expose Embedded ClientIds in Kafka Streams

Accepted Kafka 2.2 StreamsMetrics

Exposes the client IDs of Kafka Streams' embedded producer, consumer, restore-consumer, and admin client instances via ThreadMetadata. Without this, operators cannot correlate Streams thread metrics with the corresponding low-level client metrics (e.g., producer byte rates) because the embedded client IDs were opaque internal strings.

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