Context
My hosting provider is on 10.5, which is past EOL.
Questions
What is the process for upgrading?
Findings
There is a driver for backwards compatibility.
Upgrades are mostly going smoothly. Some modules need patches for php compatibility fixes.
Some modules are getting rusty and should be reviewed for replacements.
Done
Set up new repo for Drupal 11, latest php/mariadb in ddev.
Recreate multisite setup, drush aliases, ddev commands.
Sync sites, install missing modules, resolve minor issues.
TODO
Finish syncing all sites.