Munin plugin is known to have issues while generating Mysql graphs. The mysql graph remains empty due to a bug in the Perl library that causes the path to the mysqladmin to be lost.
The solution is to specify the path to mysqladmin in the /etc/munin/plugin-conf.d/cpanel.conf file. Edit the file
# nano /etc/munin/plugin-conf.d/cpanel.conf
and add the below line in the [mysql*] section
env.mysqladmin /usr/bin/mysqladmin
The mysql section should look like follows
[mysql*]
user root
group wheel
env.mysqladmin /usr/bin/mysqladmin
Restart the munin-node service and see if it works. If it doesn’t, it indicates munin cannot read the values of [...]
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