Final answer:
Server Manager is a feature in Windows Server 2016 that enables monitoring of specific server states and roles to ensure desired states are not inadvertently altered.
Step-by-step explanation:
The feature in Windows Server 2016 that enables monitoring of specific server states and roles to ensure that desired server states are not inadvertently altered is called Server Manager.
Server Manager provides a graphical interface that allows administrators to monitor and manage various aspects of the server, including roles, services, and performance.
By using Server Manager, administrators can view the current status of server roles, check for errors or warnings, and take actions to address any issues that may arise.