Apollo Federation 2.7 introduces progressive @override, a feature that allows developers to migrate any part of their graph to a new service and customize how traffic is gradually rolled over to the new service. This feature enables the rollout of changes such as field migration with a gradual percentage of traffic, allowing for easier rollback in case everything breaks. Progressive @override can be used to break down monolithic architectures or to migrate fields between subgraphs, making it an ideal tool for platform engineering efforts and self-service migrations for APIs to production. The feature is available on the Apollo Router Enterprise plan and offers a powerful new tool for better flexibility and control in service migration.