Thanks to Zenoss Master David Nalley for providing his VMware ESXi ZenPack.  Currently this ZenPack provides monitoring for host hardware of  VMware ESXi. This works on supported host platforms, and monitors fans,  temperature, RAID arrays, controllers, individual drives, raid card  batteries, power supplies, and storage.

The WBEM Classes that it checks are:

CIM_ComputerSystem
CIM_NumericSensor
CIM_Memory
CIM_Processor
CIM_RecordLog
OMC_DiscreteSensor
OMC_Fan
OMC_PowerSupply
VMware_StorageExtent
VMware_Controller
VMware_StorageVolume
VMware_Battery
VMware_SASSATAPort

Currently  it checks - and if ok, reports OK, if there is a problem, it creates an  event listing the specific component and problem.(ie which DIMM Slot a  problem is occurring with and what the problem is)

Thanks David!