KIP-71 — Enable log compaction and deletion to co-exist

Accepted Broker

KIP-71 extends the `cleanup.policy` topic config to accept a comma-separated list of policies (`compact,delete`), allowing both log compaction and time/size-based segment deletion to run concurrently on the same topic. Previously the policies were mutually exclusive, making it impossible to retain only the latest value per key while still expiring segments older than a configurable window (a key requirement for Kafka Streams join windows).

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