Your question is Client vs Server Logging. 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).
What do you log on the client versus the server?
Asked in the onsite stage. Treat this as a practical ML system design discussion. Explain which events belong on each side, how you correlate and validate them, and how the logs support model training, product analytics, debugging, and monitoring. Discuss privacy, unreliable clients, duplicate events, delayed delivery, schema evolution, and training-serving consistency.