Your question is Troubleshooting Performance Issues. 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).
Explain how you would approach troubleshooting an application performance issue using Datadog. Describe how you would determine whether the bottleneck is in the application, infrastructure, database, or downstream dependency, and how you would validate the root cause. Keep the answer focused on Datadog APM, Infrastructure Monitoring, Logs, monitors, and related diagnostic workflows.