debug: add join/rejoin diagnostic logging#2855
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Add temporary debug logging to investigate consumer rejoin flakiness
where _handle_join_success runs (logging "Enabling heartbeat thread")
but _on_join_complete never runs (missing "Setting newly assigned
partitions"), causing the consumer to spin without an assignment.
- _initiate_join_group: log create vs reuse path + future state
- join_group: log future.is_done/exception/identity after the poll,
succeeded() branch, and entry/exit of _on_join_complete
- ConsumerCoordinator.need_rejoin: log which branch is taken with
the relevant snapshot/subscription state
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Add temporary debug logging to investigate consumer rejoin flakiness
where _handle_join_success runs (logging "Enabling heartbeat thread")
but _on_join_complete never runs (missing "Setting newly assigned
partitions"), causing the consumer to spin without an assignment.
succeeded() branch, and entry/exit of _on_join_complete
the relevant snapshot/subscription state
Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com