### Overview As noted in https://gitlab.com/gitlab-org/gitlab/issues/22406#note_215157441, the changes made to visibility only applied to newly created groups; existing groups weren't migrated, causing intermittent errors. ### Proposal Migrate all existing public projects in private groups to be private projects. ### Error in Sentry https://sentry.gitlap.com/gitlab/gitlabcom/issues/198603/ ``` ActiveRecord::RecordInvalid: Validation failed: Visibility level private is not allowed since this group contains projects with higher visibility. active_record/validations.rb:79:in `raise_record_invalid' raise(RecordInvalid.new(self)) active_record/validations.rb:43:in `save!' perform_validations(options) ? super : raise_record_invalid active_record/attribute_methods/dirty.rb:29:in `save!' super.tap do active_record/transactions.rb:291:in `block in save!' with_transaction_returning_status { super } active_record/transactions.rb:351:in `block in with_transaction_returning_status' status = yield ... (219 additional frame(s) were not displayed) ActionView::Template::Error: Validation failed: Visibility level private is not allowed since this group contains projects with higher visibility. ActionView::Template::Error: Validation failed: Visibility level private is not allowed since this group contains projects with higher visibility. ```