We have a small write up about the hardware on our wiki, but it is also down right now.
I think we will share a post-mortem write up of the actual improvements we will do to avoid this in the future.
One thing I will definitly do is to add a KVM remote management console to one of our server boards and move the main firewall into a VM with hardware passthrough of the NICs (this was anyways planned for a 10gbit network upgrade for the second half of 2025). This way I should be able to reboot and even reinstall the main ingress point remotely, so that only the fiber gateway remains as a failure point that requires physical access.
As email in profile is an optional feature on our instance about 50% of the userbase opted to not share one so we would only reach some people. But yes, getting spam filtered would be another problem of mass-mailing.
But I found a way to put up a simple html error page and will add this later to inform our members and link to this thread.