/usr/ is in ruby-connection-pool 2.2.0-1.
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/connection_pool/
/usr/lib/ruby/vendor_ruby/connection_pool/timed_stack.rb
/usr/lib/ruby/vendor_ruby/connection_pool/version.rb
/usr/lib/ruby/vendor_ruby/connection_pool.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-connection-pool/
/usr/share/doc/ruby-connection-pool/copyright
/usr/share/doc/ruby-connection-pool/changelog.Debian.gz
/usr/share/doc/ruby-connection-pool/README.md
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/connection_pool-2.2.0.gemspec