This is the interface used to send events into the event subsystem - It is
typically used by the poller framework plugins that perform service
monitoring to send out aprropriate events.
In the case that the node is virtual or an independent device in a chassis
that should be reflected as a subcomponent or "child", this field reflects
the nodeID of the chassis/physical node/"parent" device.
The constant that defines a service that is up but is most likely
suffering due to excessive load or latency issues and because of that has
not responded within the configured timeout period.