An organization utilizes a software suite that consists of a multitude of underlying microservices hosted on the cloud. The application is frequently giving runtime errors. Which service will help in the troubleshooting process?

Answer options:

A.AWS CloudTrail
B.AWS CloudWatch
C.AWS X-Ray
D.Amazon OpenSearch Service

Correct Answer – C
AWS X-Ray is a service that collects data about requests that your application serves and provides tools that you can use to view, filter, and gain insights into that data to identify issues and opportunities for optimization. AWS X-Ray helps developers analyze and debug production, distributed applications, such as those built using a microservices architecture.
https://aws.amazon.com/xray/
Option A is INCORRECT because AWS CloudTrail primarily records user or API activity, ‘who has done what.’ It logs, continuously monitors, and retains account activity related to actions across AWS infrastructure. CloudTrail provides event history in the AWS account activity but NOT that of the interaction of software microservices within a suite.
https://aws.amazon.com/cloudtrail/
Option B is INCORRECT because AWS CloudWatch does the primary function of monitoring and NOT debugging. It collates data and actionable insights to monitor applications. It also responds to system-wide performance changes, optimizes resource utilization, and gets a unified view of operational health. However, the service does neither debug nor logs errors that occur amongst software microservices within a suite.
https://aws.amazon.com/cloudwatch/
Option D is INCORRECT because Amazon OpenSearch Service is a managed service that makes it easy to deploy, operate, and scale OpenSearch clusters in the AWS Cloud. It automatically detects and replaces failed OpenSearch Service nodes, reducing the overhead associated with self-managed infrastructures. 
https://docs.aws.amazon.com/opensearch-service/latest/developerguide/what-is.html