Read the documentation for mrtg (which is what ClearOS uses) at
oss.oetiker.ch/mrtg/
Here is an extract of one configuration option which might be what you are looking for... The mrtg files are in /etc/mrtg
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WithPeak
By default the graphs only contain the average values of the monitored variables
- normally the transfer rates for incoming and outgoing traffic. The following
option instructs mrtg to display the peak 5 minute values in the [w]eekly,
[m]onthly and [y]early graph. In the example we define the monthly and the
yearly graph to contain peak as well as average values.
Examples:
WithPeak[myrouter]: ym
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If not start searching the net for other graphing programs that will run under Linux such as cacti etc