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cd /usr/ports/net-mgmt/mrtg/
make install clean

cat > /usr/local/etc/mrtg/load.pl

#!/usr/bin/perl
 
$column = defined($ARGV[0]) ? $ARGV[0]:1;
$hborder = defined($ARGV[1]) ? $ARGV[1]:100;
 
$uptime=$1 if ($record=`/usr/bin/uptime`)=~m[up\s+(.*?,.*?),];
@loads=($1*100,$2*100,$3*100)
        if $record=~m[load averages: ([0-9.]+),\s+([0-9.]+),\s+([0-9.]+)];
 
print "$loads[$column]\n$loads[$column]\n$uptime\n".`hostname`."\n";

cat > /usr/local/etc/mrtg/mrtg.cfg

WorkDir: /usr/local/apache/htdocs/mrtg/
Target[cpu]: `/usr/local/etc/mrtg/load.pl 0 0`
Options[cpu]: gauge, growright, nopercent
MaxBytes[cpu]: 10000
WithPeak[cpu]: ymwd
 
Title[cpu]: Analysis of CPU load averages
PageTop[cpu]: CPU Load Averages
 
ShortLegend[cpu]: %
YLegend[cpu]: % of Load
Legend1[cpu]: .
Legend2[cpu]: % of Load
Legend3[cpu]: .
Legend4[cpu]: Peak % of Load
LegendI[cpu]:  Maximum:
LegendO[cpu]:  Loaded:

mkdir /usr/local/apache/htdocs/mrtg/
chmod +x /usr/local/etc/mrtg/load.pl
echo "*/5 * * * * root /usr/local/bin/mrtg /usr/local/etc/mrtg/mrtg.cfg" >> /etc/crontab