You can use the vimtop utility plug-in to monitor vSphere services that run in the vCenter Server Appliance.

vimtop is a tool similar to esxtop, which runs in the environment of the vCenter Server Appliance. By using the text-based interface of vimtop in the appliance shell, you can view overall information about the vCenter Server Appliance, and a list of vSphere services and their resource usage.