TL;DR: #centos and #centos-* are moving to libera.chat
Over the past few days, there has been some upheaval on the Frenode IRC network, resulting in a number of the staff members quitting and starting a new IRC network. I don't wish to explain all the details here, but you can read more at https://kline.sh which also links to other sources.
The various ops have discussed the situation, and we intend to migrate all of the various #centos-* channels from Freenode over to libera.chat over the coming days.
This will take time, since libera is still spinning up, and some servers are moving from one network to the other.
As libera is still in the early stages of setup, you may have significantly more timeouts/disconnects, netsplits and other issues for now. Until the new network is fully stable, we'll all continue to be present in the Freenode channels.
Please bring further questions to the IRC channels, which you can join on irc.libera.chat.