You can view the details of a scaling activity to check its outcome and identify the trigger, which can be a scheduled task, an event-triggered task, or a manually executed scaling rule.
Background
A scaling activity can be in one of the following states: Reject, In Progress, Success, Warning, and Failed. For more information, see Scaling activity status.
Auto Scaling performs an ECS instance rollback if it fails to add all specified ECS instances to a scaling group during a scaling activity. After the activity completes, its status is set to Warning. For more information, see ECS instance rollback.
Procedure
Log on to the Auto Scaling console.
In the navigation pane on the left, click Scaling Groups.
In the top navigation bar, select a region.
Find the scaling group that you want to manage and open its details page in one of the following ways:
In the Scaling Group Name/ID column, click the ID of the scaling group.
In the Actions column, click Details.
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At the top of the page, click the Scaling Activities tab.
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Find the scaling activity and click its ID in the Scaling Activity ID column.
The scaling activity details page shows information such as the activity status, its cause, and the total number of instances after the activity.
The scaling activity details page also includes fields such as Start Time, End Time, Details (which shows the IDs of newly created ECS instances), Status Information, and Description. At the bottom of the page, the Lifecycle Hook Execution Details section lists lifecycle hook IDs, their statuses, and default actions.