VSAX supports VMware ESXi and vCenter. To enable the server module just type in your server IP, username and password.
How to enable the notifications for the VMware© vSphere© Server monitoring
You can monitor VMware vSphere alarms only if you connect to VMware vCenter. Use the check boxes to filter out notifications that get sent by their state: Warning or Alert.
Note: The check for triggered alarms is performed every 5 minutes.