Welcome to your interview.
The question is on your right: Design Feature Success Metrics. 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've shipped a new product feature and want a clean way to judge whether it is actually creating value. The team wants one primary success metric, plus guardrails that catch harm to the broader user experience and business.
How would you design the primary metric and guardrails for a new product feature?