/usr/share/munin/plugins/load 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.
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# -*- sh -*-
: << =cut
=head1 NAME
load - Plugin to monitor the load average on a system.
=head1 CONFIGURATION
The following environment variables are used by this plugin:
=over 4
=item load_warning <float>
Threshold for when to report a warning
=item load_critical <float>
Threshold for when to report a critical
=back
=head2 EXAMPLE CONFIGURATION
[load]
env.load_warning 5
env.load_critical 10
=head1 NOTES
If run with the "autoconf"-parameter, give our opinion on wether we
should be run on this system or not. This is optinal, and only used by
munin-config. In the case of this plugin, we should most probably
always be included.
=head1 MAGIC MARKERS
#%# family=auto
#%# capabilities=autoconf
=cut
. $MUNIN_LIBDIR/plugins/plugin.sh
if [ "$1" = "autoconf" ]; then
echo yes
exit 0
fi
# If run with the "config"-parameter, give out information on how the
# graphs should look.
if [ "$1" = "config" ]; then
# The host name this plugin is for. (Can be overridden to have
# one machine answer for several)
# The title of the graph
echo 'graph_title Load average'
# Arguments to "rrdtool graph". In this case, tell it that the
# lower limit of the graph is '0', and that 1k=1000 (not 1024)
echo 'graph_args --base 1000 -l 0'
# The Y-axis label
echo 'graph_vlabel load'
# We want Cur/Min/Avg/Max unscaled (i.e. 0.42 load instead of
# 420 milliload)
echo 'graph_scale no'
# Graph category. Defaults to 'other'
echo 'graph_category system'
# The fields. "label" is used in the legend. "label" is the only
# required subfield.
echo 'load.label load'
# These two read the environment for warning values for the field
# "load". If "load_warning" or "warning" aren't set in the
# environment, no warning levels are set. Likewise for "load_critical"
# and "critical".
print_warning load
print_critical load
# This one is purely to add an explanation to the web page. The first
# one is for the graph itself, while the second one is for the field
# "load".
echo 'graph_info The load average of the machine describes how many processes are in the run-queue (scheduled to run "immediately").'
echo 'load.info 5 minute load average'
# Last, if run with the "config"-parameter, quit here (don't
# display any data)
exit 0
fi
# If not run with any parameters at all (or only unknown ones), do the
# real work - i.e. display the data. Almost always this will be
# "value" subfield for every data field.
echo -n "load.value "
cut -f2 -d' ' < /proc/loadavg
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