How would you answer an interview scenario involving Decorator pattern?

For an interview scenario involving Decorator pattern, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Decorator adds behavior around an existing abstraction without modifying the wrapped implementation. In this scenario, add caching and metrics around a service without changing its core implementation. For production, keep each decorator focused, define ordering explicitly, preserve the wrapped contract, and add tracing around the chain. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.