Minetest CPU usage plugin for munin

    #!/bin/bash
    #munin plugin for cpu usage monitoring of minetestserver for given port
    #author: Ritchie
    #thanks Pitriss for advices
    #inspired by plugin minecraft-users-ram_
    #https://github.com/munin-monitoring/contrib/blob/master/plugins/minecraft/minecraft-users-ram_
    #Author & instructions: http://wiki.natenom.name/minecraft/munin-plugin

    LC_LANG=C
    MT_PORT=${0##*_}

    if [ "$1" = "config" ]
    then
        echo "graph_args --base 1000 -r --lower-limit 0 --upper-limit 100"
        echo "graph_title Minetestserver CPU usage (Port ${MT_PORT})"
        echo "graph_category minetest"
        echo "graph_info This graph shows CPU usage for minetestserver."
        echo "graph_vlabel %"
        echo "graph_scale no"
        echo "graph_period second"
        echo "cpuusage.label cpu usage"
    exit 0
    fi

    MT_PID=$(netstat -ulpn 2>/dev/null | grep ${MT_PORT}  | sed -n -e '1p' | awk '{ print $6 }' | cut -d'/' -f1)
    if [ ! -z "${MT_PID}" ]
    then #is running
        CPUusage=$(ps aux | grep ${MT_PID} | grep -v grep | awk '{print $3}')
    else

        CPUusage=0
    fi

    printf "cpuusage.value %3.2f\n" "${CPUusage}"