/usr/ is in ruby-pluggaloid 1.1.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/pluggaloid/
/usr/lib/ruby/vendor_ruby/pluggaloid/error.rb
/usr/lib/ruby/vendor_ruby/pluggaloid/event.rb
/usr/lib/ruby/vendor_ruby/pluggaloid/filter.rb
/usr/lib/ruby/vendor_ruby/pluggaloid/handler.rb
/usr/lib/ruby/vendor_ruby/pluggaloid/handler_tag.rb
/usr/lib/ruby/vendor_ruby/pluggaloid/identity.rb
/usr/lib/ruby/vendor_ruby/pluggaloid/listener.rb
/usr/lib/ruby/vendor_ruby/pluggaloid/plugin.rb
/usr/lib/ruby/vendor_ruby/pluggaloid/version.rb
/usr/lib/ruby/vendor_ruby/pluggaloid.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-pluggaloid/
/usr/share/doc/ruby-pluggaloid/README.md
/usr/share/doc/ruby-pluggaloid/changelog.Debian.gz
/usr/share/doc/ruby-pluggaloid/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/pluggaloid-1.1.1.gemspec