Device and monitor state changes occur when after a poll, the status of the device or a monitor assigned to the device has changed from the status found on the poll preceding the most recent poll.
In the Device List or Map View, a bold device name indicates that the device has undergone a state change, and that state change has not been acknowledged. To acknowledge a device state, right-click the device and click Acknowledge.
For more information, see Using Acknowledgments.
Tip: The State Change Acknowledgment report gives a list of devices in a device group whose state changes need acknowledgment.