After installing and configuring this daemon you should be able to monitor vital system data (e.g. the CPU load) using PRTG Network Monitor. Simply create a new sensor, choose "SNMP Library" sensor and select the "Basic Linux Library" from the list of available libraries.
Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.