load.in

#!@@GOODSH@@
# -*- 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_criting 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