/usr/lib/ruby/vendor_ruby/ is in ruby-lograge 0.5.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/lograge/
/usr/lib/ruby/vendor_ruby/lograge/formatters/
/usr/lib/ruby/vendor_ruby/lograge/formatters/cee.rb
/usr/lib/ruby/vendor_ruby/lograge/formatters/graylog2.rb
/usr/lib/ruby/vendor_ruby/lograge/formatters/json.rb
/usr/lib/ruby/vendor_ruby/lograge/formatters/key_value.rb
/usr/lib/ruby/vendor_ruby/lograge/formatters/l2met.rb
/usr/lib/ruby/vendor_ruby/lograge/formatters/lines.rb
/usr/lib/ruby/vendor_ruby/lograge/formatters/logstash.rb
/usr/lib/ruby/vendor_ruby/lograge/formatters/ltsv.rb
/usr/lib/ruby/vendor_ruby/lograge/formatters/raw.rb
/usr/lib/ruby/vendor_ruby/lograge/log_subscriber.rb
/usr/lib/ruby/vendor_ruby/lograge/rails_ext/
/usr/lib/ruby/vendor_ruby/lograge/rails_ext/rack/
/usr/lib/ruby/vendor_ruby/lograge/rails_ext/rack/logger.rb
/usr/lib/ruby/vendor_ruby/lograge/railtie.rb
/usr/lib/ruby/vendor_ruby/lograge/version.rb
/usr/lib/ruby/vendor_ruby/lograge.rb