Discovery maintains a "last seen on the network" timestamp for each device in your network.
This timestamp can help you determine if a device should not be monitored anymore and if it can be removed from the system. Using the information in this timestamp, you can define usage policies. For example, you may conclude that a device that has not been seen by the Discovery process in more than 45 days is no longer valid. This information is stored in the MDB so that you can run queries against this value for inventory reports.
The "last seen on the network" timestamp updates a property that contains the length of time that a device was not seen by the Discovery process. This time can be determined by when a device was last successfully accessed or when network traffic was last seen from the device.
Whenever Discovery runs a ping sweep and successfully addresses an object, it saves this information. The Classic Discovery process updates the MDB immediately, and the Continuous Discovery process holds this information in the Discovery agent caches until the Discovery Manager requests this information. You can configure the Discovery Manager to poll the agents for this information on a regular basis.
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