We need a very detailed documentation set that described the
location and usage of pretty much every parameter you could set in a
Heat environment for t-h-t -- in other words, almost an API doc for
t-h-t.

This would be useful for way more than this one
customer, and I wonder if we already have something like it. If not, I
would think it would be a really helpful thing for customers and even
for casual community users. Ideally it would be automated in some way, as described in this thread:

http://post-office.corp.redhat.com/archives/rh-openstack-dev/2017-January/msg00181.html