IPMI management
Most of modern servers are now equipped with IPMI Interface (https://en.wikipedia.org/wiki/Intelligent_Platform_Management_Interface) or some other other management card (eg ILO from HP). It could be very useful to add a tab in the "server" page to enter management IP address, type... and then we could be able to poweroff and poweron the server with one click. And for the management card which dispose of additional fonctionalities , one button to launch Web interface and/or remote console will be great.