kafka.request.produce_failed_rate

When network processor average idle percentage drops significantly, it indicates the broker is overwhelmed processing network I/O, leading to client-side request timeouts before requests reach handler threads.

When CockroachDB changefeeds emit to Kafka and the high_water_timestamp lag increases significantly, it indicates the Kafka sink cannot keep up with database changes. This creates backpressure where database CDC events queue up, potentially causing CockroachDB performance degradation.

When ISR count drops below min.insync.replicas, producers configured with acks=all will fail with NotEnoughReplicasException, blocking writes to maintain durability guarantees.