KIP-1076 — Metrics for client applications KIP-714 extension

Accepted Kafka 4.0 MetricsClient

Extends KIP-714's client metrics telemetry framework to include application-level metrics from Kafka Streams instances, not just the embedded producer/consumer clients. Cluster operators can observe client-side metrics via the broker pull mechanism, but Kafka Streams applications emit additional metrics (task-level lag, state store sizes, etc.) that remain invisible without this extension.

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