Correct answers - "CloudWatch Metrics" : Amazon CloudWatch monitors your Amazon Web Services
(AWS) resources and the applications you run on AWS in real time. You can use CloudWatch to
collect and track metrics, which are variables you can measure for your resources and
applications. CloudWatch alarms send notifications or automatically make changes to the
resources you are monitoring based on rules that you define.
"CloudWatch Alarms" - Alarms work together with CloudWatch Metrics. CloudWatch alarms check
metrics based on the current time in UTC.
Incorrect answers
"X-Ray" - While X-Ray would work to visualize error rates between services, it won't be possible
to create a CloudWatch Alarm on top of it.
"CloudTrail" - CloudWatch is a monitoring service whereas CloudTrail is more of an audit service
where you can find API calls made on services and by whom
"SSM" - SSM cannot be used to monitor error rates of your applications.