I also would like more information on this. VSphere 5 doesnt seem to have rpm installation capabilites. I also couldnt find yum or apt. I'm pretty new to VMSphere, so any help, tutorials, walkthru's would be much appreciated!
vSphere 5 is no longer based on RedHat, and not longer has any semblance of an RPM system.
You wont be able to install RPMs (easily) in it - and honestly, and agent based method of monitoring these hosts is the wrong way to go. A check based on WBEM/CIM is the future and direction vSphere is going: http://exchange.nagios.org/directory/Plugins/Operating-Systems/*-Virtual-Environments/VMWare/Check-hardware-running-VMware-ESXi/details
What are the news on this issue ?
It's great that you found and revived a post from 2012...
The news is in the post above yours. VMware uses CIM to monitor the health of an ESXi host and monitoring tools can also retrieve this information.