A company has an application that runs only on Amazon EC2 Spot Instances.

Comprehensive and Detailed Explanation From Exact Extract of Amazon Web Services (AWS) Architect documents:

Spot Instances can be interrupted when AWS needs the capacity back. To reduce interruptions and improve availability, AWS provides the capacity-optimized allocation strategy.

Capacity-optimized strategy launches Spot Instances from the most available Spot capacity pools instead of the lowest-priced ones, reducing interruption rates.

By adding multiple instance types (e.g., using Instance Type Flexibility), the Auto Scaling group can launch instances in a broader set of pools, improving the chance that capacity is available.

Scheduled scaling actions combined with a diverse set of instances under the capacity-optimized strategy ensure higher resilience and better timing for instance launches.

This approach directly supports the Resiliency design principle in the AWS Well-Architected Framework.

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Best Practices for EC2 Spot Instances

Capacity-Optimized Allocation Strategy