Your question is Design a New Engagement Metric. 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).
How would you design a new engagement metric for a retail analytics mobile application?
Explain which user behavior the metric should capture, how you would calculate it, and why it would be more useful than basic measures such as daily active users or session duration. Describe how you would validate that the metric reflects meaningful product value rather than superficial activity.