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Four years later, it's time to sunset message formats v0 and v1 to establish a new baseline in terms of supported client/broker behavior and to improve maintainability & supportability of Kafka. This also aligns with KIP-679, which will enable the idempotent producer by default in Apache Kafka 3.0 (and requires message format v2). We propose the deprecation of message formats v0 and v1 in Apache Kafka 3.0 and to disallow writes with v0 or v1 in Apache Kafka 4.0.

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