The Multi Router Traffic Grapher is a tool primarily used to monitor the
traffic load on network links (typically by using SNMP). MRTG generates HTML
pages containing PNG images which provide a LIVE visual representation of this
traffic. MRTG typically produces daily, weekly, monthly, and yearly graphs.

In addition to monitoring via SNMP, MRTG can also generate graphs based on
the output of any application, allowing one to generate graphs of anything
that needs monitoring (for example, CPU and memory usage, email volumes, web
hits, etc). For faster data collection, MRTG can also interface to RRDtool.

The mrtg-doc package contains additional documentation, contributed scripts
and configuration files that used to form part of the mrtg package.