A Rebalance happens when:
1. A consumer JOINS the group
2. A consumer SHUTS DOWN cleanly
3. A consumer is considered DEAD by the group coordinator. This may happen after a crash or when the consumer is busy with
a long-running processing, which means that no heartbeats has been sent in the meanwhile by the consumer to the group
coordinator within the configured session interval.
4. New partitions are added
1. A consumer JOINS the group
2. A consumer SHUTS DOWN cleanly
3. A consumer is considered DEAD by the group coordinator. This may happen after a crash or when the consumer is busy with
a long-running processing, which means that no heartbeats has been sent in the meanwhile by the consumer to the group
coordinator within the configured session interval.
4. New partitions are added
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