this is a spiritual revert of a85c8907e863d44c80a4caac5da097de3bf0b2bc.

infra4future.de sadly is no more; hence chaski now also serves as the
main host to serve gtfs realtime requests

not sure how permanent this will be, but for now it allows me to do some
things that would otherwise be hard.

this updates mollysocket as well as its config. Unfortunately, it still
seems to work about as badly as before.

This reverts commit a86a04f9e26854ec967c46a6ad3f015364fb91a6. It has
since been merged into nixpkgs master, and i'm unsure if i will continue
using it.

not sure if this is a good idea or not, but i always liked how the
IRC #voc-wok channel of the c3voc works, and I don't run my own IRC (nor
do i want to have my monitoring on infra that is not my own), so I built
a similar thing with matrix.

https://github.com/NixOS/nixpkgs/pull/278981

with thanks to networkException, who wrote the initial nix package.

so it turns out ntfy can run a little smtp server, which monit can send
its alerts to, resulting in a halfway okayish monitoring setup. It
doesn't even require mucking about with `sendmail'!

Downside: this is still monit.

Upside: from what I've heard, the other monitoring tools don't actually
seem to be all that much better?

Now I only have to come up with reasonable checks for the stuff I want
to actually keep an eye on …

not sure if i like this yet, but it seems worth trying it out.