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  • Classic Protocol: REMAIN_IN_GROUP behaves as expected, the member stays in the consumer group, enabling a faster rebalance upon restart.
  • Streams Protocol (KIP-1071), dynamic member: The member unconditionally leaves the group regardless of this setting, since remaining in the group provides no benefit for non-static members under the new protocol.
  • Streams Protocol (KIP-1071), static member: The member should remain in the group by defaulㄎtdefault. Static membership is explicitly configured to reduce rebalance disruption on restart, and leaving the group on close would significantly reduce the benefit of static membership.. Notably, the underlying consumer already differentiates close semantics based on membership type, making this behavior both natural and consistent.

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