How would you test Kafka Exactly-Once Semantics?

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Use the parent topic “Kafka Exactly-Once Semantics” as context. Cover testing approach, production metrics, or scale impact as asked — then refine with AI Mentor below.

Parent context — Kafka Exactly-Once Semantics

Common mistakes: Assuming EOS covers DB update without idempotency key. Best practices: Outbox table + relay; idempotency keys on consumers.

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