#!/bin/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_warn <load>

Warning threshold for load (Default: 10)

=item load_crit <load>

Critical threshold for load (Default: 120)

=back

=head1 AUTHOR

Unknown author

=head1 LICENSE

Unknownl LICENSE

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

# If run with the "autoconf"-parameter, give our opinion on whether we
# should be run on this system or not. This is optional, and only used by
# munin-config. In the case of this plugin, we should most probably
# always be included.

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 [ "$1" = "config" ]; then
        LOAD_WARN=${load_warn:-10}
        LOAD_CRIT=${load_crit:-120}

	# 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 are optional. They are only used if you have
	# configured your munin to tell a Nagios-server about any
	# problems
	echo "load.warning $LOAD_WARN"
	echo "load.critical $LOAD_CRIT"
	# 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 Average load for the five minutes.'

	# 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.

printf "load.value "
uptime  | sed -e 's/^.*load averages: [^ ]* //' -e 's/ [^ ]*$//'