A scaling action adds instances to or removes instances from an AS group. It ensures that the number of instances in the application system is the same as the number of expected instances.
A scaling action is triggered when the number of instances in an AS group is not the same as the expected number. This occurs when the condition specified by an AS policy is met or after you manually change the expected number of instances.
The following describes the expected number of instances (Expected Instances) and its related concepts.
The expected number of instances must fall between the minimum and maximum.
For details, see section Scaling Actions.