In Auto Scaling, the cool-down time of a scaling group refers to the lockout period...

During the cool-down time, only the scaling activities in the same scaling group are locked.

You can’t skip a scaling group’s cool-down time period right after a scaling activity is just finished.

When multiple ECS instances are added or removed from a scaling group, the cool-down time begins only when the last instance has been added or removed from the scaling group.

During the cool-down time of a scaling group, only the alarms from CloudMonitor can bypass the cool-down time and trigger scaling activities, whereas other scaling activities, such as manually triggered ones, will still be subject to the cool-down time.