Amazon EC2 Auto Scaling

Amazon EC2 Auto Scaling now supports batch instance termination

in a single API call. You can now pass up to 100 instance IDs to the TerminateInstanceInAutoScalingGroup API to terminate them as a batch, reducing the number of API calls needed to scale down your Auto Scaling groups.

Amazon EC2 Auto Scaling now supports Instance Refresh in CloudFormation

Amazon EC2 Auto Scaling now supports Instance Refresh as a new AWS CloudFormation update policy. When you configure the new AutoScalingInstanceRefresh update policy and update properties that require instance replacement, CloudFormation automatically triggers an Instance Refresh.

Amazon EC2 Auto Scaling now supports reservations then balanced Availability Zone distribution

Amazon EC2 Auto Scaling now offers reservations-then-balanced, a new Availability Zone (AZ) distribution strategy that prioritizes launching instances into your capacity reservations before distributing remaining capacity evenly across Availability Zones.