kernel update and reboot postponed. Things were not happy testing that offsite. There aren't any patches for critical vulnerabilities in this release cycle, that I know of. Instead, we're on Mastodon 4.5.18 now, up from 4.4.x. Please send a message if that broke anything.
#MastoAdmin junk: 4.4.25 to 4.5.18 was pretty smooth, but the v4.5.18 branch included a .ruby-version file for a different version of Ruby than installed, and that broke the "bundle install" step. Deleting that let "bundle install" work. Still doing NODE_OPTIONS=--max-old-space-size=4096 RAILS_ENV=production bundle exec rails assets:precompile so it doesn't error on running out of heap with the Debian nodejs.