Starting today, you can request EC2 capacity based on your workload’s instance requirements. Attribute-based instance type selection, a new feature for Amazon EC2 Auto Scaling, EC2 Fleet, and Spot Fleet, makes it easy to create and maintain instance fleets without researching and selecting EC2 instance types. This is useful for running instance type flexible workloads and frameworks such as containers, big data, and CI/CD, or for simple cases where you want your instance fleets to automatically use the latest generation instance types. Instead of creating and maintaining a list of acceptable instance types, you can now simply define your instance requirements once, and let attribute-based instance type selection handle the rest.
Source:: Amazon AWS