#!/bin/bash

WARNING=( 8 5 2 )
CRITICAL=( 10 8 3 )
while test $# -gt 0; do
    case $1 in
        (-h|--help) cat <<EOF
$0 [OPTIONS]

OPTIONS

  -h, --help                show this help

  -w, --warning   "a b c"   set warning threshold for:
                            a: 1min, b: 5min, c: 15min average
                            (default: ${WARNING[@]})

  -c, --critical  "a b c"   set critical threshold for:
                            a: 1min, b: 5min, c: 15min average
                            (default: ${CRITICAL[@]})

DESCRIPTION

Icinga plugin to check load average per CPU. Shows 1min, 5min 15min
average per CPU. Different to check_load, the load is divided by the
number of CPU units and therefore normalized. So the same warning and
critical levels fit for any server.

EOF
                    exit;;
        (-w|--warning) shift; WARNING=( $1 );;
        (-c|--critical) shift; CRITICAL=( $1 );;
    esac
    if test $# -lt 1; then
        echo "ERROR: missing option, try $0 --help"
        exit 1
    fi
    shift
done

a=( $(cut -d' ' -f 1-3 </proc/loadavg) )
level=0
txt=OK
for ((i=0;i<3;++i)); do
    a[$i]=$(bc -l <<< "${a[$i]}/$(nproc)")
    if test $level -lt 1 -a $(bc -l <<< "${a[$i]}>${WARNING[$i]}") -eq 1; then
        level=1
        txt=WARNING
    fi
    if test $level -lt 2 -a $(bc -l <<< "${a[$i]}>${CRITICAL[$i]}") -eq 1; then
        level=2
        txt=CRITICAL
    fi
done
echo $txt - load average: $(printf '%.2f, %.2f, %.2f|load1=%.3f;%.3f;%.3f;0; load5=%.3f;%.3f;%.3f;0; load15=%.3f;%.3f;%.3f;0;' ${a[@]} ${a[0]} ${WARNING[0]} ${CRITICAL[0]} ${a[1]} ${WARNING[1]} ${CRITICAL[1]} ${a[2]} ${WARNING[2]} ${CRITICAL[2]})
exit $level