Sorry about that! We had a bug in the ‘version-check’ API endpoint on our side. 578 is the number of commits between the beginning of 2026.7.0-latest and v2026.7.0, so that’s where it comes from.
I’ve fixed things up, so the UI should go back to normal after your site next does a version-check.
If you’d like to speed it up, visit /sidekiq/scheduler and trigger Jobs::CallDiscourseHub