Abstract: Example apparatus and methods manage membership in a collection of servers participating in providing a service. An example device may provide a user interface that provides a single coherent view of the in-service state (e.g., in-service, out-of-service) of members of the collection of servers. The example device may also provide a request monitor that selectively blocks a membership request to a target device when the membership request will cause the set of functionalities to be suspended. If a service manager tries to take the only in-service server out-of-service, the action may be selectively blocked and the service manager may receive a notification of the potential result of the action. Taking a server out-of-service may include stopping messages from flowing to the server.