Your question is Defining Success Without Requirements. 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).
Describe a situation where you had to define success metrics for a project that lacked clear requirements. Explain how you translated ambiguous goals into measurable outcomes, selected leading and lagging indicators, aligned stakeholders, and handled trade-offs or changing priorities. Reference the evidence you used, such as project objectives, stakeholder input, product or operational data, and baseline performance.