LibreOffice fresh updated today to version 6.1.4-2 however it fails to start due to a missing dependency boost-libs 1.69.0-1 which was not on the extra repo.
If you need LibreOffice in a hurry then you can get the dependency from here https://www.archlinux.org/packages/extra/x86_64/boost-libs/ and install it locally.
boost-libs (http://mirror1.artixlinux.org/repos/world/os/x86_64/boost-libs-1.69.0-1-x86_64.pkg.tar.xz) is already on 1.69.0-1 on our main mirror.
What's your mirror?
Server = https://ftp.sh.cvut.cz/artix-linux/$repo/os/$arch
Is at the top of the list.
Is that wrong?
Edit. I see from the wiki that clarkson.edu is listed as the top repo so I changed to that and got 200Mb of updates, so I guess that answers my own question.
Edit2. Then one of those updates changed mirrorlist again, so now dotsrc.org is the top mirror. I hope that is right.
All mirrors are right, it's just that some of them sync more frequently than others.