Some network infrastructure and most Unix/Linux devices will generate syslog messages sent out to syslog receivers, in this case the OnsiteManager, regarding the device status. The Onsite Manager will accept Syslog messages from all devices.
Each syslog-generating device must be given the host name or IP address of the Onsite Manager server to use as the syslog receiver. Consult the vendor documentation on how to configure the syslog receiver for each supported device at the customer site.