If you install the normal Linux agent (rpm) on a vCenter appliance, you will get the usual Linux agent checks i.e. mostly information related to the operating system itself.
If you are curious about the internal function of the appliance, you can do this, sure. But IMO this information is not really relevant on an appliance. I’m not going to modify the swap size or tune some kernel parameters on that system, anyway. Rather treat it as a blackbox and check it using only the supplier’s tools.