I find the confluence wiki to be completely unusable when you're dealing with lots of preformatted text and code fragments. In other words it's a terrible place to document a REST API.
So I chose to document the reportingrest module's REST API in its github wiki, which lets me write markdown in my IDE. (And I linked to it from the module's wiki page. (This also gets it a bit closer to the code, and lowers the bar a bit to updating the documentation next time the code gets updated.)
In general 95% of things should be on wiki.openmrs.org.
I was wondering who turned off the wiki, so I'm glad we figured that out! Please opt-out reportingrest from having its wiki disabled. You may leave the issues disabled though.