I am looking for cloud-init documentation. I have been through https://help.ubuntu.com/community/CloudInit
I need to know what all namespace are supported by cloud-init. e.g. "byobu_by_default" is a valid resource where as "This_is_great" is not a valid resource.

I did extensive googling but could not find any documentation unless and of course I take a look at the source code. Also I had been through the “examples” directory and it was helpful but I wanted above said documentation.

Any pointers will be of great help.