Installation d’un plugin en python : https://github.com/arthur-debert/munin-httpresponse-plugin/blob/master/httpresponsetime

$ sudo vi /usr/share/munin/plugins/httpresponsetime
 -> Copie du script.
$ sudo ln -s  /usr/share/munin/plugins/httpresponsetime /etc/munin/plugins/httpresponsetime
$ sudo chmod +x  /usr/share/munin/plugins/httpresponsetime /etc/munin/plugins/httpresponsetime
$ sudo apt-get install python-setuptools python-dev build-essential
$ sudo easy_install pip
$ sudo pip install httplib2

Ajout dans le fichier :

$ sudo vi /etc/munin/plugin-conf.d/munin-node
...
[httpresponsetime]
    env.urls https://www.cyber-neurones.org
...

Et on relance :

$ sudo munin-node-configure --shell
$ sudo service munin-node restart

Et voici le résultat :