Debug a Non-Responsive Service

You're on call. The frontend application in namespace prod is failing with 502 errors. Your objective:

• Identify the cause (Service? Endpoint? Pod? NetworkPolicy?).
• Fix the issue so that curl backend-service:5000/health succeeds from the frontend pod.

Constraints:

• Do not delete the service.
• Only patch or replace resources.

Hint: use kubectl exec, describe and logs smartly.