PRTG Manual: CPU/Processor Load
The CPU Load monitor allows you to monitor the CPU load of a devices CPU/Processor. When a CPU monitor runs it requests the CPU load from the monitored devices and compares the result with the monitors specified thresholds.
The CPU monitor editor contains the following tabs that require configuration: Settings, Devices, Schedule, Event, and History.
The Schedule, Events and History settings are the same for all monitor types. See Configuring Monitors for more information about configuring these settings. For the other tabs see the information below.
Name
The Monitor name is the name of the monitor used to refer to the monitor in the monitors list view, and in monitor events and notifications. Monitor names must not be unique but it is recommended you use unique names to differentiate them.
Threshold
The CPU monitor threshold specifies the CPU load level that would produce a down and warning state. The warning level must be less than or equal to the critical level. The warning and critical levels must be between 0 and 100.
The devices tab allows you to select which devices and their respective CPU/Processors to monitor. The CPU monitor can monitor 1 or more CPU's on a device depending on what CPU information is available on that device.
To add Devices/Processors to the monitor select the 
button in the lower left corner. A device selector will be presented allowing you to choose one or more devices to monitor. When the device is selected each of the devices CPUs will be added to the monitor. Note: Only devices with an assigned SNMP or WMI credential will be available in the picker. If you do not see a device ensure it has the appropriate credential assigned.
To edit which CPUs on a device to monitor. Select the device or one of its CPUs in the list and press the edit button 
. A list of all of the devices available CPUs will be presented. Check the CPUs you would like to monitor and close the dialog. The monitored CPU list will be updated to reflect the changes. Note: If a CPU is not available it could be because it was not discovered during device discovery. To update the list ensure valid credentials are available and rediscover the device. See Monitored Devices for more information.
To remove a device or CPU from the monitor select the device or CPU in the list and press the delete 
button. The device/CPU will be removed from the monitor.
Note: UVexplorer is able to collect the CPU information using either the SNMP protocol or on windows machines using the WMI protocol. When selecting a CPU to monitor the entry in the list will indicate which protocol was used to collect that information. If a windows machine has both an SNMP and WMI agent enabled with valid credentials for each, then the CPU information could be collected using both protocols. If this occurs each CPU will have two entries in the monitor selection list, one for each protocol. This is done to allow you to specify which protocol you would like to use to collect the information. If the agents are written correctly the information should be the same for either. We recommend, and will choose by default, the SNMP protocol since it is usually quicker.
See Monitor Device Picker for more information on choosing devices.
