KIP-1231 — Deprecate '--max-partition-memory-bytes' option in ConsoleProducer

Accepted Kafka 4.2 Producer

Deprecates the --max-partition-memory-bytes CLI argument in kafka-console-producer.sh with a warning message, directing users to --batch-size which maps to the same underlying batch.size producer config. Having two options that configure the same property with different names created confusion, and --max-partition-memory-bytes is a misleading name that implies a per-partition memory limit rather than a batch size.

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