I have 3 products that I use to monitor my hosts. vCenter, vFoglight, and of course Dell OpenMange/DRAC card software on my Dell boxes.
Of all of these I find that using the Dell software is the best for alerting me to actual hardware problems. I prefer vFoglight for performance monitoring of the guests/hosts and letting me know about available resources. If I were you I would setup the Dell OpenManage and DRAC card.
1)Go to support.dell.com. Select your servers, or enter the service tag. Select your OS in the drop-down. Download Dell OpenManage System Administrator (stand alone).
2)Install via mounting the ISO from vCenter or make a physical disk and connect to the DVD drive in vCenter
3)Do the express install. You may have to restart the esx mgt services and/or the dell services. 4)Connect to OpenMange via a browser https://your server IP or DNS name:1311
5)Configure Openmange (setup alarms, setup SMTP server)
6)Setup the DRAC in OpenManage - give it an IP and change the default/root password
7)Connect to the DRAC side in a web browswer and check the configuration.
Alerts will now come off the box from your DRAC IP. After all the mail is setup do a test by pulling 1 power cable and reconnecting. You should see 4 mails come off the box (power redundancy degraded, power redundancy lost, then it coming back) - Just a simple test to make sure you are getting the mail through.