Welcome to your interview.
The question is on your right: Separate Retention From Short Term Engagement. 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 to understand its full impact. The team cares about both immediate usage signals and whether the feature creates behavior that lasts beyond the first burst of activity.
How would you analyze whether a new feature is improving long-term retention or just creating short-term engagement?