AWS Resilience Hub provides a central place to define, validate, and track the resiliency of your AWS applications using AWS Well-Architected best practices. Customers can get a comprehensive view of their overall application portfolio resilience status, their associated resilience scores, and actionable recommendations.

This resilience score is designed to assess the readiness of your environment for resilience, not only from a technical perspective with resiliency policies and alarms, but also by validating the successful completion of your recommended Standard Operating Procedures (SOPs) and fault injection experiments with AWS Fault Injection Simulator (FIS).

Read on AWS’s blog: https://aws.amazon.com/blogs/mt/how-to-use-the-aws-resilience-hub-score/