Which AWS service should the developer use to troubleshoot the application?

Explanations:

Amazon Inspector is a security assessment service that helps improve the security and compliance of applications deployed on AWS. It does not specifically provide debugging or troubleshooting capabilities for runtime errors in applications.

AWS CloudShell is a browser-based shell that enables developers to interact with AWS resources using command-line tools. While useful for accessing AWS services, it does not provide direct capabilities for troubleshooting runtime errors in applications.

AWS CodeStar is a service that provides a unified user interface for managing software development activities, including project management and CI/CD. It is not designed for debugging or troubleshooting runtime issues in microservices applications.

AWS X-Ray is a distributed tracing service that helps developers analyze and debug applications, especially those built on microservices. It provides insights into the performance of services, traces requests as they travel through the application, and helps identify bottlenecks and errors in runtime.