Read an X-Ray service map

Use the X-Ray service map explorer to read node health and trace the critical path. Switch between the Healthy, Payment API degraded, and DynamoDB throttling scenarios and watch the node colors change. Select any node to inspect its error rate and latency, and note which nodes are flagged on the critical path.

Question: In the Payment API degraded scenario the Payment API node turns red. What does that color tell you, and where should you focus first?