/usr/lib/ruby/ is in ruby-exception-notification 4.0.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/generators/
/usr/lib/ruby/vendor_ruby/generators/exception_notification/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/exception_notifier/
/usr/lib/ruby/vendor_ruby/exception_notifier/email_notifier.rb
/usr/lib/ruby/vendor_ruby/exception_notifier/campfire_notifier.rb
/usr/lib/ruby/vendor_ruby/exception_notifier/notifier.rb
/usr/lib/ruby/vendor_ruby/exception_notifier/webhook_notifier.rb
/usr/lib/ruby/vendor_ruby/exception_notifier/hipchat_notifier.rb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_data.html.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/exception_notification.html.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_request.html.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_request.text.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_backtrace.html.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/background_exception_notification.text.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_title.html.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_title.text.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_backtrace.text.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_session.html.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_environment.text.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/background_exception_notification.html.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_data.text.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_session.text.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/exception_notification.text.erb
/usr/lib/ruby/vendor_ruby/exception_notifier/views/exception_notifier/_environment.html.erb
/usr/lib/ruby/vendor_ruby/exception_notification/
/usr/lib/ruby/vendor_ruby/exception_notification/rails.rb
/usr/lib/ruby/vendor_ruby/exception_notification/sidekiq.rb
/usr/lib/ruby/vendor_ruby/exception_notification/resque.rb
/usr/lib/ruby/vendor_ruby/exception_notification/rack.rb
/usr/lib/ruby/vendor_ruby/exception_notification.rb
/usr/lib/ruby/vendor_ruby/exception_notifier.rb
/usr/lib/ruby/vendor_ruby/generators/exception_notification/templates/
/usr/lib/ruby/vendor_ruby/generators/exception_notification/templates/exception_notification.rb
/usr/lib/ruby/vendor_ruby/generators/exception_notification/install_generator.rb