Check out this post and download the attached workbook for a start.
There's also quite a bit of good content on this post.
You could also try searching the forum for Tableau Server Admin Views. There's quite a few workbooks that have been published on the forum contain this type of information. Fortunately, all you need to do is download and update the connection information with your server and username/password.
Thanks for the links! Especially the second one that is really interesting.
I think this question would need a better official documentation.