Final answer:
Migrating a monolithic application to a microservices architecture aligns with the Operational Excellence pillar of the AWS Well-Architected Framework, enhancing deployment, resilience, and manageability.
Step-by-step explanation:
The plan of migrating a monolithic application into a microservices architecture relates to the Operational Excellence pillar of the AWS Well-Architected Framework. This is because microservices contribute to the overall operational efficiency by enabling frequent and reliable deployment of updates, better system resilience, and more scalable and manageable application structures. The migration from monolithic to microservices often requires careful planning and execution, including refactoring the application and deciding on how to break it down into individual services that can be developed, deployed, and operated independently.