MRTG is awesome, but by default it’s limited to SNMP metrics.
The MRTG extension packages allow for the monitoring of performance analysis metrics over SSH or locally, and they’re easy to set up, configure and maintain. With these extensions installed, it's possible to monitor UNIX performance metrics such as CPU and memory utilization, as well as paging, swapping and process statistics. Plus, since you don’t need to have an SNMP daemon running, your system is more secure.
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