Your question is Diagnose Pipeline Performance Drop. 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).
A customer reports a sudden drop in performance in a production data pipeline. You need to diagnose whether the slowdown is coming from ingestion, stream processing, storage, orchestration, or downstream transformations, and determine the fastest path to isolate the issue.