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Target customers: Users that require automated ECS auditing and maintenance. Features released: 1. When the status of an ECS instance changes, an ECS instance status change event is triggered. The status change may be caused by a console, API, or SDK operation, auto scaling, or overdue payment. The status change can also be caused by a system exception. An ECS instance may be in one of these status: Pending, Starting, Running, Stopping, Stopped, or Deleted. 2. Preemptable instances may be automatically released due to insufficient resources. A preemptable instance release notification is sent 5 minutes before the instance is released. 3. You can use Message Service (MNS) to subscribe to all the events, and use the MNS SDK to automatically receive and handle notifications. 4. All events can trigger Function Compute.