Hi there @AniruddhaPimpalkhare,

What I could suggest is either setting up a monitoring solution like Netdata for example:

https://www.digitalocean.com/community/tutorials/how-to-set-up-real-time-performance-monitoring-with-netdata-on-ubuntu-16-04

Another thing that you could suggest is installing sysstat which would gather some useful information for you.

To do that just run the following command:

sudo apt install sysstat

After that edit the /etc/default/sysstat fiel and set the following to true:

ENABLED="true"

Finally start the service and enable it:

sudo systemctl start sysstat
sudo systemctl enable sysstat

To test if the command works, just run:

sar

Then you could also do is to use the following script and set it run as a cron job for a couple of days:

#!/bin/bash

timeNow=$(date "+%F_%H:%M")

filename="/root/processes_logs/log_${timeNow}.log"

if [ ! -d "/root/processes_logs" ]; then
    mkdir /root/processes_logs
fi

touch ${filename}

printf " ### Time of scan: $(date +%F_%H:%M) ### \n\n" >> ${filename}

###
printf "\n ################## RAM ################## \n" >> ${filename}

printf "\n ### Current Memory Usage: ### \n\n" >> ${filename}
free -tm >> ${filename}

printf "\n ### Top 10 processes by RAM usage: ### \n\n" >> ${filename}
ps aux | awk '{print $2, $4, $11}' | sort -k2rn | head -n 10 >> ${filename}

printf "\n ### RAM usage history for the last hour ###: \n\n" >> ${filename}
sar -r -s $(date "+%H" -d "1 hour ago"):$(date "+%M"):00 -e $(date "+%H"):$(date "+%M"):00 >> ${filename}

printf "\n ### Swap usage history for the last hour: ### \n\n" >> ${filename}
sar -S -s $(date "+%H" -d "1 hour ago"):$(date "+%M"):00 -e $(date "+%H"):$(date "+%M"):00 >> ${filename}

###
printf "\n\n ################## CPU ################## \n" >> ${filename}

printf "\n ### Current load: ### \n\n" >> ${filename}
uptime | cut -d' ' -f10-16 >> ${filename}

printf "\n ### Sar history for last hour: ### \n\n" >> ${filename}
sar -s $(date "+%H" -d "1 hour ago"):$(date "+%M"):00 -e $(date "+%H"):$(date "+%M"):00 >> ${filename}

###
printf "\n\n ################## Disk: ################## \n" >> ${filename}
df -h >> ${filename}

###
printf "\n\n ################## Apache ################## \n" >> ${filename}

printf "\n ### IPs Connected to the server: ### \n\n" >> ${filename}
netstat -tn 2>/dev/null | grep :80 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | head >> ${filename}
echo >> ${filename}

###
printf "\n\n ################## MySQL ################## \n" >> ${filename}

printf "\n ### MySQL uptime: ### \n\n" >> ${filename}
mysqladmin ver | grep Uptime >> ${filename}

printf "\n ### MySQL connections: ### \n\n" >> ${filename}
mysql -e "show status like '%onn%';" >> ${filename}

printf "\n ### MySQL processlist: ### \n\n" >> ${filename}
mysql -e "show full processlist;" >> ${filename}

I’ve used this script in the past, it could be updated a little bit but it should provide you with some useful information.

Don’t forget to remove the cron job once you’ve gathered enough information.

Hope that this helps!
Regards,
Bobby