This post will walk you through the process of installing a plugin to monitor your munin nodes/clients for CPU usage per process
Note that the edits are to be done on the node(s).

Original script page: http://www.ajohnstone.com/achives/monitoring-processes-with-ps/

Plugin code:

Create /usr/share/munin/plugins/proc_cpu:

emacs /usr/share/munin/plugins/proc_cpu

with the following contents:

#!/bin/sh
#
# (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 processes env var, i.e.:
#
# [proc_mem]
# env.processes        php mysqld apache2
#

. $MUNIN_LIBDIR/plugins/plugin.sh

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

processes=${processes:="php mysqld apache2"}

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'
        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 $processes; do
                  echo "$proc.label $proc"
        done
        exit 0
fi

TMPFILE=`mktemp -t top.XXXXXXXXXX` && {

  top -b -n1 > $TMPFILE

  for proc in $processes; do
    value=$(cat $TMPFILE | grep $proc | awk 'BEGIN { SUM = 0 } { SUM += $9} END { print SUM }')
    echo "$proc.value $value"
  done
  rm -f $TMPFILE
}

Now:

chmod 755 /usr/share/munin/plugins/proc_cpu
ln -s /usr/share/munin/plugins/proc_cpu /etc/munin/plugins/proc_cpu

Edit: /etc/munin/plugin-conf.d/munin-node

Add the following to the end of that file:

[proc_cpu]
user munin
group munin

Restart the service:

service munin-node restart

The data will appear under:
Overview :: MuninMonitor :: MuninMonitor :: proc cpu

Tips:
The plugins are put in /usr/share/munin/plugins/pluginname. They need to be chmodded to 755. There should be a link to the plugin from /etc/munin/plugins/pluginname. Once installed, restart munin-node with:

service munin-node restart

Please also check this:http://munin-monitoring.org/browser/munin-contrib/plugins/system/cpu-usage-by-process

Also try this:

cd /usr/share/munin/plugins
wget https://redmine.koumbit.net/projects/munin-contrib/repository/revisions/256709738d6a15b80715d91de4b7af55f1e3905e/raw/plugins/processes/multicpu
chmod 755 multicpu
ln -s multicpu /etc/munin/plugins/multicpu
service munin-node restart

New script:
Edit /etc/munin/plugin-conf.d/munin-node
Add the following lines to the end:
[proc_mem]
env.processes php mysqld apache2

Now add the script:

#!/bin/bash
#Get last 5 min cpu load
load=$(uptime | awk '{print $11}' | sed 's/[^a-zA-Z0-9.]//g')
echo "CPU load:"$load
if (( $(echo "$load > 0.8" | bc -l) ))
then 
	#CPU load is high (>1)
	#Gets list of top 10 processes using cpu load and adds them to log list
	proclist=$(ps -Ao fname,pcpu | sort -nrk 2,2 | awk '!x[$1]++' | awk '{print $1}' | head -n 10 | sed ':a;N;$!ba;s/\n/ /g')
	echo "Top processes: "$proclist
	sed -i "/env.processes/c\env.processes        $proclist/g" /etc/munin/plugin-conf.d/munin-node
	#Now restart
	service munin-node restart
else 
	echo "CPU load is ok"
fi

Add the cron job:

*/5 * * * * /bin/bash /root/bash-advanced-scripts/topprocesses

Joel G Mathew

Joel G Mathew, known in tech circles by the pseudonym Droidzone, is an opensource and programming enthusiast.

He is a full stack developer, whose favorite languages are currently Python and Vue.js. He is also fluent in Javascript, Flutter/Dart, Perl, PHP, SQL, C and bash shell scripting. He loves Linux, and can often be found tinkering with linux kernel code, and source code for GNU applications. He used to be an active developer on XDA forums, and his tinkered ROMS used to be very popular in the early 2000s.

His favorite pastime is grappling with GNU compilers, discovering newer Linux secrets, writing scripts, hacking roms, and programs (nothing illegal), reading, blogging. and testing out the latest gadgets.

When away from the tech world, Dr Joel G. Mathew is a practising ENT Surgeon, busy with surgeries and clinical practise.