Access Munin metrics by opening up the port and then pointing your node code at the munin node.
var Munin = require('munin.js');
var munin = new Munin('munin-node.example.com');
munin.connect(function (err, client) {
});
munin.list(console.log);
munin.version(console.log);
munin.nodes(console.log);
munin.fetch('cpu', console.log);
munin.config('swap', console.log);
munin.quit();