Munin plugin to track CPU usage from specific processes based on process id's

proc_cpu_pid

#!/bin/sh
#
# Extended 2015 by Andrew Crookston <andrew@caoos.com> to use pidfiles instead of process names
# Original (c) 2010, Andrew Johnstone andrew @ajohnstone.com
# Based on the 'proc_mem' plugin, written by Rodrigo Sieiro rsieiro @gmail.com
#
# Configure it by using the pidfiles env. Format: name:pidfile name:pidfile. e.g.:
#
# [proc_cpu_pid]
# env.pidfiles munin-node:/var/run/munin/munin-node.pid
#

. $MUNIN_LIBDIR/plugins/plugin.sh

if [ "$1" = "autoconf" ]; then
        echo yes
        exit 0
fi

pidfiles=${pidfiles:="munin-node:/var/run/munin/munin-node.pid"}

if [ "$1" = "config" ]; then

        NCPU=$(egrep '^cpu[0-9]+ ' /proc/stat | wc -l)
        PERCENT=$(($NCPU * 100))
        if [ "$scaleto100" = "yes" ]; then
                graphlimit=100
        else
                graphlimit=$PERCENT
        fi
        SYSWARNING=`expr $PERCENT '*' 30 / 100`
        SYSCRITICAL=`expr $PERCENT '*' 50 / 100`
        USRWARNING=`expr $PERCENT '*' 80 / 100`

        echo 'graph_title CPU usage by process ids'
        echo "graph_args --base 1000 -r --lower-limit 0 --upper-limit $graphlimit"
        echo 'graph_vlabel %'
        echo 'graph_category processes'
        echo 'graph_info This graph shows the cpu usage of several processes'

        for proc in $pidfiles; do
                  name=${proc%:*}
                  echo "name.label $name"
        done
        exit 0
fi


for proc in $pidfiles; do
  name=${proc%:*}
  pid=`cat ${proc#*:}`
  value=$(top -b -n1 -p $pid | grep "\b$pid\b" | awk 'BEGIN { SUM = 0 } { SUM += $9} END { print SUM }')
  echo "$name.value $value"
done