This page contains a link to fedmsg.com which is owned by an unrelated party now.
fedmsg.com
https://docs.fedoraproject.org/en-US/package-maintainers/Upstream_Release_Monitoring/#_anitya
https://pagure.io/fedora-docs/package-maintainer-docs/blob/7fa522266bc90f15ee124376f409b897ddfca142/f/modules/ROOT/pages/Upstream_Release_Monitoring.adoc#_38
I would open a PR but not sure what link to use instead (or if link is needed).
Thank you for reporting this. Fedmsg is in the process of being replaced with a different solution, so finding a working and useful link will get more and more difficult over time.
I found fedmsg.readthedocs.io, which is maybe a bit developer centric, but still documents the right thing. So I created #112, which I will merge shortly unless somebody has a better link in mind.
Fixed by 1eef429
Metadata Update from @oturpe: - Issue status updated to: Closed (was: Open)