Your question is Separate Retention From Short Term Engagement. 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).
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?