[1] that is being updated. A lot of the live configs are also on NOC [2]. Between sites like NOC and access to Puppet (via Git), you've got a majority of the data AS it is actually used (rather than as it was, when written, on wiki).
Well, sure, but that's nap-of-earth; without a solid 5000ft view grounding you, I suspect it's hard to make use of.
I haven't yet read the book-prep page that was posted the other day; on reflection, I suspect that (and the book chapter that comes from it) will tell the things I'm looking for.
Basically everything is on noc and in puppet. Those will always be more up-to-date than our documentation. That said, most of our newer services are very well documented, and many of our older services have at least adequate documentation.
AFAIK, the only services with less than adequate documentation are the PDF servers and search. Mobile is slightly out of date since we just changed that entire architecture, but it'll be up to date soon.
- Ryan