Welcome to your interview.
The question is on your right: Post-Implementation Success 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 do you measure the success of a project post-implementation, and how do you gather feedback for continuous improvement?