Optimal instance type configuration to receive automatic instance family updates

AWS Batch supported a single option in instanceTypes for optimal to match the demand of your job queues. We've introduced two new instance type options: default_x86_64 and default_arm64. We will use default_x86_64 if you make no instance type selection. These new options will automatically select cost-effective instance types across different families and generations based on your job queue requirements, allowing you to get your workloads running quickly.

The optimal option now selects instance types from modern m, c, and r instance families based on regional availability. AWS Batch periodically updates the pool with newer generations within these families. If you are using optimal, no action is needed on your part.

However, please be aware that only ENABLED and VALID Compute Environments (CEs) will be updated with new instance types. If you have any DISABLED or INVALID CEs, they will receive updates once they are re-enabled and set to a VALID state.