In Auto Scaling, a scaling group refers to the collection of ECS instances deployed with...

In Auto Scaling, a scaling group refers to the collection of ECS instances deployed with the same applications, where these ECS instances can be charged by monthly subscription or Pay-As-You-Go. For scenarios with abrupt service traffic change, Pay-As-You-Go ECS instances can meet service requirements while minimizing cost. For monthly subscription ECS instances, you can manually add the idle instances to the scaling group to take full advantage of idle resources.