Amazon AppStream 2.0 now allows you to use Amazon CloudWatch to monitor your fleets

You can now use Amazon CloudWatch to monitor your Amazon AppStream 2.0 fleets. With CloudWatch metrics for AppStream 2.0, you can easily view the size and utilization of your fleet resources, and you can set alarms so that you can be notified when there is insufficient capacity to support your users, and react to changes in your fleet.
Quelle: aws.amazon.com