How would you test Kafka Exactly-Once Semantics?

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→What metrics prove Kafka Exactly-Once Semantics is healthy in prod?Open
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→What are common failure modes of Kafka Exactly-Once Semantics?Open

Parent context — Kafka Exactly-Once Semantics

Baseline: Idempotent producer + transactional writes (read-process-write in one transaction) give EOS within Kafka. End-to-end EOS needs idempotent sinks or outbox pattern.

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