Scalr/installer — pull request #12 by awheeler (2013-09-06 13:50:41+00:00)
Title: Install and configure rrdcached, enabling graphs.

This seems to be the gist of it. Let me know if I missed something.
I debated just giving www-data ownership of /var/lib/rrdcached/db.
Not sure why it says it can't automatically merge the branch. This is my first time submitting a pull since they changed the layout, so I probably missed some new step.