Hyper-V CPU Wait Time Per Dispatch alarm
The CPU Wait Time Per Dispatch alarm is raised when the average queue time for the virtual machine waiting for CPU to become available exceeds a threshold.
Hyper-V Virtual Machine Heartbeat alarm
The Hyper-V Virtual Machine Heartbeat alarm is raised when the virtual machine has stopped responding to the hypervisor or is not responding at regular intervals.
Hyper-V Virtual Overhead alarm
The Hyper-V Virtual Overhead alarm is raised on excessive CPU being used by the hypervisor on a virtual machine. This is effectively the housekeeping overhead for a Virtual Machine.