Welcome to your interview.
The question is on your right: Schema for Real-Time Metrics. 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.
How would you design a data schema to track real-time performance metrics from a consumer hardware device?