/usr/share/munin/plugins/ipac-ng is in munin-plugins-extra 2.0.33-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74  | #!/bin/sh
# -*- sh -*-
: << =cut
=head1 NAME
ipac-ng - Skeleton-plugin to monitor ipac-ng rules. 
=head1 CONFIGURATION
No configuration
=head1 USAGE
To monitor a rule, copy ipac-ng and edit variables.
=head1 AUTHOR
Unknown author
=head1 LICENSE
GPLv2
=head1 MAGIC MARKERS
 #%# family=contrib
 #%# capabilities=autoconf
=cut
# Visible name of graph
TITLE="traffic"
# perlre(1) expressions passed to ipacsum -f. For more info
# `man ipacsum`, `man perlre`.
UP="upload rule"
DOWN="download rule"
if [ "$1" = "autoconf" ]; then
        if [ -x /usr/sbin/fetchipac ] && [ -x /usr/sbin/ipacsum ]; then
                echo yes
                exit 0
        else          
                echo no
                exit 0
        fi            
fi
if [ "$1" = "config" ]; then
        echo "graph_order down up"
        echo "graph_title $TITLE" 
        echo 'graph_args --base 1000'
        echo 'graph_vlabel b/s in (-) / out (+)'
        echo 'down.label received'              
        echo 'down.graph no'
        # Divide it by 1500 seconds (5m), to get b/s
        echo 'down.cdef down,1500,/'                
        echo 'up.label b/s'         
        echo 'up.negative down'
        echo 'up.cdef up,1500,/'
        exit 0
fi;
fetchipac || error=1  
if [ "$error" != "1" ]; then
        ipacsum -s 5m -x -f "$UP" | tail -n 1 | cut -d : -f 2 | awk \
                {'print "up.value " $1'}                             
        ipacsum -s 5m -x -f "$DOWN" | tail -n 1 | cut -d : -f 2 | awk \
                {'print "down.value " $1'}                             
else
        echo 'up.value 0'
        echo 'down.value 0'
fi
 |