Welcome to your interview.
The question is on your right: Diagnose Production Latency Incident. 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.
A production system has started showing elevated latency, and users are reporting slower page loads and API responses. You need to quickly determine whether the issue is caused by a recent change, an infrastructure bottleneck, or an external dependency so the team can stabilize the service without creating more risk.
Given a scenario where a system is experiencing latency, how would you approach diagnosing the issue?