PRTG Manual: Scheduled Discovery Events
Scheduled discoveries run on a periodic basis. Each time a scheduled discovery runs, important events that occur during the discovery are added to the event log. These events are helpful in monitoring the activity and progress of your scheduled discoveries.
Each time a scheduled discovery runs, the following types of events are added to the log:
An event is generated each time a scheduled discovery ends execution.
An event is generated when a scheduled discovery does not run because it is already running. This happens when scheduled discovery runs are scheduled too close together, and one execution does not have time to complete before the next one begins. If this occurs, you should change your discovery schedule so that the discovery runs are farther apart.
An event is generated each time an error occurs during a scheduled discovery run.
An event is generated each time a new device appears on the network. For core devices (routers, switches, wireless access points, servers, etc.), events are generated every time one of these devices appears on the network. For dynamic devices that come and go on the network (cell phones, tablets, laptops, etc.), events are generated only when such a device appears on the network, and it has not been seen recently on the network. The settings of a scheduled discovery control how long a dynamic device must be gone from the network before it is considered new. (See the scheduled discovery setting named ‘Remember dynamic devices for’.)
An event is generated each time a core device (router, switch, wireless access point, server, etc.) disappears from the network. These events are not generated for dynamic devices (cell phones, tablets, laptops, etc.), because it is entirely expected that these devices will frequently leave the network.
An event is generated each time a new link appears on the network (i.e., each time a new connection between devices is detected).
An event is generated each time a link between core devices disappears from the network. Core devices are devices that form the core of your network, such as routers, switches, wireless access points, servers, etc. Each time a connection between such devices disappears, an event is generated. Events for removed links involving dynamic devices (cell phones, tablets, laptops, etc.) are not generated, because it is entirely expected that these devices will frequently leave the network.
