Our hoster replied and the problem is, that the move to a new OpenVZ version was successful, but they still have problems with it so they shut down all servers on the VM host. Sorry for that. #kannouncements
The hoster will reply when it's back online, https://up.koyu.space will update and we will post a message here on this account.
Our hoster replied and gave us the new IP address of the server. We changed the dns entry and the Git server is now back. Happy hacking! #kannouncements