The VIM Event is:
com.vmware.vc.cim.CIMGroupHealthStateChanged
This event occurs when the hardware' IPMI subsystem has reported some issue which is then
sent via SFCBD to VWS process in vCenter and sent out as an SNMP trap in you case.
Determine the ESX system in question then use your GUI to visit VC's Inventory to find
that ESX System and click on the hardware health tab.
Alternately use your Hardware vendor's GUI/element mgmt system to review your system's
hardware health state.
The SNMP Trap is defined in VMWARE-VC-EVENTS-MIB, that can be obtained
from: the zip file at :http://communities.vmware.com/community/developer/forums/managementapi
Here's a dump of the oids to name
# VMWARE-VC-EVENT-MIB list of identifiers (generated by smidump 0.4.8)
VMWARE-VC-EVENT-MIB vmwVCNotifications node 1.3.6.1.4.1.6876.4.3.0
VMWARE-VC-EVENT-MIB vpxdAlarm notification 1.3.6.1.4.1.6876.4.3.0.201
VMWARE-VC-EVENT-MIB vpxdDiagnostic notification 1.3.6.1.4.1.6876.4.3.0.202
VMWARE-VC-EVENT-MIB vpxdAlarmInfo notification 1.3.6.1.4.1.6876.4.3.0.203
VMWARE-VC-EVENT-MIB vmwVCMIB node 1.3.6.1.4.1.6876.4.3.1
VMWARE-VC-EVENT-MIB vmwVCMIBConformance node 1.3.6.1.4.1.6876.4.3.1.2
VMWARE-VC-EVENT-MIB vmwVCMIBCompliances node 1.3.6.1.4.1.6876.4.3.1.2.1
VMWARE-VC-EVENT-MIB vmwVCMIBBasicCompliance compliance 1.3.6.1.4.1.6876.4.3.1.2.1.2
VMWARE-VC-EVENT-MIB vmwVCMIBBasicComplianceRev2 compliance 1.3.6.1.4.1.6876.4.3.1.2.1.3
VMWARE-VC-EVENT-MIB vmwVCMIBGroups node 1.3.6.1.4.1.6876.4.3.1.2.2
VMWARE-VC-EVENT-MIB vmwVCAlarmInfoGroup group 1.3.6.1.4.1.6876.4.3.1.2.2.1
VMWARE-VC-EVENT-MIB vmwVCNotificationGroup group 1.3.6.1.4.1.6876.4.3.1.2.2.2
VMWARE-VC-EVENT-MIB vmwVCAlarmGroup group 1.3.6.1.4.1.6876.4.3.1.2.2.3
VMWARE-VC-EVENT-MIB vmwVCAlarmNotificationGroup group 1.3.6.1.4.1.6876.4.3.1.2.2.4
VMWARE-VC-EVENT-MIB vmwVpxdTrapType scalar 1.3.6.1.4.1.6876.4.3.301
VMWARE-VC-EVENT-MIB vmwVpxdHostName scalar 1.3.6.1.4.1.6876.4.3.302
VMWARE-VC-EVENT-MIB vmwVpxdVMName scalar 1.3.6.1.4.1.6876.4.3.303
VMWARE-VC-EVENT-MIB vmwVpxdOldStatus scalar 1.3.6.1.4.1.6876.4.3.304
VMWARE-VC-EVENT-MIB vmwVpxdNewStatus scalar 1.3.6.1.4.1.6876.4.3.305
VMWARE-VC-EVENT-MIB vmwVpxdObjValue scalar 1.3.6.1.4.1.6876.4.3.306
VMWARE-VC-EVENT-MIB vmwVpxdTargetObj scalar 1.3.6.1.4.1.6876.4.3.307
VMWARE-VC-EVENT-MIB vmwVpxdTargetObjType scalar 1.3.6.1.4.1.6876.4.3.308