Provide a list of fallback mirrors in case of a server error
There are currently two Onionoo instances running, and more are being set up. If one of them fails, users have to manually switch to another instance by using an Atlas/Globe/Compass mirror that uses an Onionoo mirror that is still working.
The easy part is to configure a set of URLs and have Onionoo give them out in case of a server error. Well, not easy, but solvable.
The harder part is to make sure that Onionoo clients will be able to use this information, either by displaying alternatives, or by automatically switching to one of them.
How would Onionoo clients want to learn about fallback mirrors? In a custom JSON document, using an HTTP 3xx status code, or using some other mechanism?