NameError in ActiveSupport::LoggerThreadSafeLevel after concurrent-ruby update
Context A Rails application on an older 6.x or 7.0 line begins raising a NameError referencing an uninitialized constant inside ActiveSupport::LoggerThreadSafeLevel after a routine bundle update . The backtrace points to the first logging call or to boot, not to application code. The root cause is a transitive dependency shift: concurrent-ruby stopped requir
rails