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Head-of-Line Blocking on JoinGroup causes cascading rebalances

Head-of-Line Blocking on JoinGroup causes cascading rebalances: a task in LegoFlow-SWE (Harbor dataset). The core observable problem is that a consumer configured with a high max.poll.interval.ms becomes unstable: metadata requests time out, the broker connection is dropped, and the consumer keeps…

The task

The core observable problem is that a consumer configured with a high `max.poll.interval.ms` becomes unstable: metadata requests time out, the broker connection is dropped, and the consumer keeps rebalancing even though the original JoinGroup would have succeeded if given more time.

Part of Lego-X/LegoFlow-SWE.