When a device state changes, regardless of any action that has been placed on the device, WhatsUp Gold uses the Acknowledgement feature to make you aware that the state change occurred. The name of the device name appears in bold in the Device List and on a black background in the Map View.
After the device is in Acknowledgement mode, it will remain so until you actively acknowledge it.
Note: Acknowledging a device state change does not keep that device from firing actions. To stop a device from firing actions, you must put the device into maintenance mode.