How monitor AWS managed service

Hi, You can use AWS Health Dashboard to monitor AWS services and you can also setup notifications.

More information on AWS Health Dashboard you can find here

The AWS Health Dashboard is the single place to learn about the availability and operations of AWS services. You can view the overall status of AWS services, and you can sign in to view personalized communications about your particular AWS account or organization. Your account view provides deeper visibility into resource issues, upcoming changes, and important notifications.