A rolling update stalls halfway: new replicas crash-loop and old ones are already scaled down. What are your first moves?

The reflex is rollback and it is usually right. Shared state, changed credentials and unavailable old artifacts can make an undo incomplete or unsafe. Verify those dependencies before choosing the recovery.

Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.