Your question is Monitoring Strategy for System Performance. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are discussing how you keep a production system healthy after launch. The interviewer wants to understand not just which monitoring tools you know, but how you choose them, what you monitor, and how you make the data actionable for engineering and operations.
What tools do you use for monitoring system performance, and how do you decide what each tool should measure and who should act on it?