KIP-1237 — Deprecate group.coordinator.rebalance.protocols config

Accepted Kafka 4.3 Consumer

Deprecates the group.coordinator.rebalance.protocols server configuration, which is now superseded by feature version flags (group.version, streams.version, share.version) managed via kafka-features. The config was a coarse gate for enabling new group protocols; the feature version system introduced by KIP-1022 provides the same capability with proper cluster-wide upgrade/downgrade semantics.

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