title: How to add missing plugins to collectd
body: <p>I have installed <a href="http://collectd.org/" rel="nofollow">collectd</a> on my ubuntu machine. 
  I would like to enable the redis <a href="https://collectd.org/wiki/index.php/Redis" rel="nofollow">plugin</a> , but its not shipped by default with it. Anyone knows how and where can i download that plugin ?</p>