I believe this is done, at least on the x/build/maintner side. In the *maintner.Corpus (from x/build/maintner/godata), the issue tracker of golang/gddo GitHub repo has 96 open issues and 304 closed issues right now. That matches the counts at https://github.com/golang/gddo/issues exactly.
Is there anything else that needs to be done here @kevinburke?
Edit: I think I misunderstood what this issue was about. It's not about just adding support for non-Go issue trackers (which is done), but rather for supporting links to those in context of gopherbot. Sorry.
Jul 15, 2016
404 This is not the web page you are looking for.
all: subrepos need to be green #11811