Elastic Compute Service - ECS - Instance Health Status Supported on ECS Instance Details Page
The ECS instance details page now supports displaying the health status of instances to help you quickly learn potential risks that may impact the operation of your instances and allows you to manage exceptions. Instances running in their lifecycle have three types of health status: OK means that no exceptions have been detected on the instances. Warning means that exceptions have been detected on instances, which may affect the operation of the instances. Maintenance means that the system is performing maintenance operations such as online upgrade and migration. The instances may be affected for a short period of time. The health status is not available for instances that are not in the Running status.