Correct answer - "X-Ray" : AWS X-Ray helps developers analyze and debug production, distributed
applications, such as those built using a microservices architecture. With X-Ray, you can
understand how your application and its underlying services are performing to identify and
troubleshoot the root cause of performance issues and errors.
"API Gateway" - Amazon API Gateway allows you to process hundreds of thousands of concurrent API
calls
"CloudWatch" - You can view error rates for each of your Lambda functions by using the AWS the
CloudWatch console but X-Ray will help you with troubleshooting
"CloudTrail" - With CloudTrail you can see the API calls being made by X-Ray but X-Ray is the
service helping you determining performance issues