Config
Why do configuration changes cause outages as often as code changes?
Whether the candidate treats configuration as a deployable with its own blast radius, testing and rollback story.
The situation behind the question
A rate-limit value lives in a central configuration service that all instances poll every 30 seconds. An engineer edits it in the web UI, adding a trailing space. The value parses to zero, every request is rejected within 30 seconds, and the UI shows no history of the previous value.