@clacke Well, I don't think that it should be expected that the server delivers such a feed, but if it does you could always subscribe to it as with any other RSS/Atom feed if enabled on your server. For some reason we haven't enabled Atom links for !GNUsocial user tag feeds, but at least RSS 1.0 is linked: https://social.umeahackerspace.se/mmn/tag/hashtag
Note, this won't work for ActivityPub since it defies the long-established standards of feeds and requires various magic protocol specific mechanisms and artificial server intelligence .)
@zplus The downtime? I can't give an exact estimate, but I recall there were multiple days in a row it would happen. Maybe once a month it would happen for a short time.
The community and the schools built an observatory in town (~25 years ago). Shortly after that, the municipality and real estate developers put in bright, sky-fading streetlights as part of a shopping center project. Now the observatory is almost unused because of light pollution.