You can monitor the hardware health status of the vCenter Server Appliance by using the API commands in the appliance shell. You can also monitor the health status of the update component for information about available patches.
A particular health status can be green, yellow, orange, red, or gray. For more information, see View the vCenter Server Appliance Health Status.
For a complete list of the API commands that you can use for monitoring statistics and health of the vCenter Server Appliance system, see API Commands in the vCenter Server Appliance Shell.