/usr/share/munin/plugins/swap is in munin-node 1.4.6-3ubuntu3.
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 | #!/bin/sh
# -*- sh -*-
: << =cut
=head1 NAME
swap - Plugin to monitor swap IO in number of blocks per second
=head1 CONFIGURATION
No configuration
=head1 AUTHOR
Unknown author
=head1 LICENSE
Unknown license
=head1 MAGIC MARKERS
#%# family=auto
#%# capabilities=autoconf
=cut
. $MUNIN_LIBDIR/plugins/plugin.sh
if [ "$1" = "autoconf" ]; then
if [ -r /proc/stat ]; then
echo yes
exit 0
else
echo "no (no /proc/stat)"
exit 0
fi
fi
if [ "$1" = "config" ]; then
echo 'graph_title Swap in/out'
echo 'graph_args -l 0 --base 1000'
echo 'graph_vlabel pages per ${graph_period} in (-) / out (+)'
echo 'graph_category system'
echo 'swap_in.label swap'
echo 'swap_in.type DERIVE'
echo 'swap_in.max 100000'
echo 'swap_in.min 0'
echo 'swap_in.graph no'
print_warning swap_in
print_critical swap_in
echo 'swap_out.label swap'
echo 'swap_out.type DERIVE'
echo 'swap_out.max 100000'
echo 'swap_out.min 0'
echo 'swap_out.negative swap_in'
print_warning swap_out
print_critical swap_out
exit 0
fi
if [ -f /proc/vmstat ]; then
awk '/pswpin/ { print "swap_in.value " $2 } /pswpout/ { print "swap_out.value " $2 }' < /proc/vmstat
else
awk '/swap/ { print "swap_in.value " $2 "\nswap_out.value " $3 }' < /proc/stat
fi
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