Which design principle is included in the operational excellence pillar of the AWS Well-Architected Framework?

Explanations:

Creating annotated documentation is important for operational excellence but is not a specific principle of the AWS Well-Architected Framework. It is more of a best practice for knowledge management and not directly tied to the operational excellence pillar.

Anticipating failure is a key principle of the operational excellence pillar. It involves preparing for potential issues before they arise, ensuring that systems are resilient and can recover quickly from failures, thus maintaining service continuity.

Ensuring performance efficiency is a principle under the performance efficiency pillar of the AWS Well-Architected Framework, not under operational excellence. This focuses on using resources efficiently to meet system requirements.

Optimizing costs is associated with the cost optimization pillar of the AWS Well-Architected Framework. This principle focuses on managing costs effectively while delivering value, but it is not part of the operational excellence pillar.