So the upgrade did not go entirely smoothly. I set the site to read-only, powered down, did a full machine snapshot, powered back up and then tried to upgrade. But the Click here to upgrade link did not do anything. So then I manually went to admin/upgrade and upgraded Docker which went ok, and then upgraded Discourse which failed, with among other messages:
$ bundle install --deployment --jobs 4 --without test development
--deploymentflag is deprecated because it relies on being remembered across bundler invocations, which bundler will no longer do in future versions. Instead please use
bundle config set --local deployment 'true', and stop using this flag
--withoutflag is deprecated because it relies on being remembered across bundler invocations, which bundler will no longer do in future versions. Instead please use
bundle config set --local without 'test development', and stop using this flag
Fetching gem metadata from https://rubygems.org/…
web-push-3.0.0 requires ruby version >= 3.0, which is incompatible with the
current version, 2.7.6
Docker Manager: FAILED TO UPGRADE
So then I logged in and did the manual upgrade, git pull / launcher rebuild app and that seems to have worked and got me back up and running.
I turned off read-only mode, but now no editor preview shows to the right of the Reply/New Message editor - the area just remains blank white.
Any suggestions as to how to figure out why the preview is not displaying?
The only plugins I have are discourse-mark and discourse-solved.
Not sure why discourse-mark doesn’t have a tick. Perhaps I should try removing and/or reinstalling that (if that’s a good idea, a pointer to how to do that would be helpful).