Github.com is down

>>AlphaW+(OP)
Putting your status page on a separate domain for availability reasons: good

Not updating that status page when the core domain goes down: less good

>>dmatti+L3
I prefer https://downdetector.com . The users get to vote there. No corporate filtering ( ostensibly )

>>eYrKEC+4c
Quis custodiet ipsos custodes?

>>Zamico+tm
If you mean them going the Glassdoor/Yelp route and letting github et al buy the aforementioned corporate filtering, the assumption is that you'd eventually hear about it and stop trusting them, just like you should with Glassdoor and Yelp.

If you just mean checking whether downdetector.com is down, obviously you have to use a different service for that.

In either case, you should of course always have at least two custodes for cross-checking and backup purposes. (Which is the problem re Glassdoor and Yelp.)

zlacker