The blog post series details the journey of migrating the TicketMonster application from a monolithic structure to a microservices architecture, focusing on removing the legacy user interface (UI) and introducing a new decoupled UI component, tm-ui-v1. The process involves assessing the performance of the new UI, which, despite slightly higher response times due to an additional service layer, is deemed acceptable. As the legacy UI becomes obsolete, the code is streamlined by removing the old UI, creating a more compact backend version, backend-v1, deployed using canary release strategies. This involves an informal dark launch to internal users and gradually increasing the traffic load to the new backend and UI components. The article emphasizes the use of Apigee Edge API Proxy to manage traffic routing and deployment, ensuring a smooth transition with full end-to-end visibility, ultimately enabling the next step of extracting specific domain-based microservices within the backend.