Which of the following is not a key feature of Cisco UCS Manager?

Service Profile Templates are indeed a feature of Cisco UCS Manager, so the choice indicating that they are not a key feature is not accurate. In fact, Service Profile Templates allow for the creation of standardized configurations that can be applied consistently across multiple servers. This streamlines the process of deploying new servers within the UCS environment, ensuring consistency and reducing configuration errors.

Looking at the other features, Service Profiles are essential components of Cisco UCS, providing a means to encapsulate the server's identity, including its configuration and policies. Management Interface Options enable users to control and manage the UCS infrastructure effectively, offering flexibility in how administrators interact with the system. Policy Domain Service Templates help manage resource policies efficiently by grouping similar templates together, fostering better organization and easier management across the network.

Each of these features significantly contributes to the manageability and automation capabilities of the Cisco UCS environment. Therefore, indicating that Service Profile Templates is not a key feature overlooks their importance in UCS infrastructure management.