The step-by-step documentation is fantastic, makes life so much easier for those just getting started with Sensu. Kudos to the authors.
One detail seems to be missing. On Ubuntu 14.04 (and, I presume, other distros too) the sensu package installs four services in /etc/init.d: sensu-api, sensu-client, sensu-server, and sensu-service. It seems likely that sensu-client needs to be enabled on a client, and sensu-server and sensu-api need to be enabled on a server. It’s less clear what sensu-service does and where it should be enabled. I think the documentation should spell out which ones of these four services need to be enabled, and on what systems.
I’m guessing this info should be added to the http://sensuapp.org/docs/latest/packages page, or in various other places in the Installation, Getting Started, or Configuration sections.