Welcome to your interview.
The question is on your right: Metrics for Phased Rollout Monitoring. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
You're rolling out a new change in stages and need a metric view that helps you decide whether to expand, pause, or reverse the rollout. You want to track early operational signals without losing sight of downstream customer and business impact.
What metrics would you use to monitor a phased rollout of a new operational process or product?