Welcome to your interview.
The question is on your right: Define Metrics for New Features. 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 working on a new feature for a mobile-first banking product, and the team needs to decide how success should be measured. Early usage may look promising, but leadership wants confidence that the metric reflects real customer value rather than superficial activity.
How would you define the right product metric for a new feature, and how would you ensure it reflects user value rather than vanity usage?