The Windows CPU - Individual CPU Usage alarm is activated when the average CPU utilization of a single processor exceeds a threshold. This value is taken over a specific number of background collections.
Sustained high CPU utilization of a single processor on multiprocessor systems indicates that process threading may not be functioning efficiently.
When the alarm is raised
Look at the Processes page on the Windows Server | Processes Drilldown to find out which Windows process is consuming the CPU. The process: