I will be starting the installation of Mastodon v4.1.1 for all Masto.host servers.
Each instance will go down for about 30 seconds during the upgrade installation.
v4.1.1 introduces some fixes and improvements. You can read the full log here https://github.com/mastodon/mastodon/releases/tag/v4.1.1
One of the improvements has a compatibility issue with OpenStack Swift and I will be doing a temporary work around, as I describe here: https://github.com/mastodon/mastodon/issues/24146
Any questions, please let me know.