Partition 11 added by autoscaler. Consumer group begins rebalance.
Lag alert fires at 500K threshold. Page delivered to on-call.
On-call acknowledges. Initial hypothesis: upstream producer spike. Incorrect.
Member 7f2a identified as unresponsive; rebalance never completed.
Member evicted. Rebalance completes in 9s. Lag drains over 14m.
Lag below threshold. Monitoring for 45m before closing.