/usr/ is in ruby-logging 2.2.2-1.
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/logging/
/usr/lib/ruby/vendor_ruby/logging/appender.rb
/usr/lib/ruby/vendor_ruby/logging/appenders/
/usr/lib/ruby/vendor_ruby/logging/appenders/buffering.rb
/usr/lib/ruby/vendor_ruby/logging/appenders/console.rb
/usr/lib/ruby/vendor_ruby/logging/appenders/file.rb
/usr/lib/ruby/vendor_ruby/logging/appenders/io.rb
/usr/lib/ruby/vendor_ruby/logging/appenders/rolling_file.rb
/usr/lib/ruby/vendor_ruby/logging/appenders/string_io.rb
/usr/lib/ruby/vendor_ruby/logging/appenders/syslog.rb
/usr/lib/ruby/vendor_ruby/logging/appenders.rb
/usr/lib/ruby/vendor_ruby/logging/color_scheme.rb
/usr/lib/ruby/vendor_ruby/logging/diagnostic_context.rb
/usr/lib/ruby/vendor_ruby/logging/filter.rb
/usr/lib/ruby/vendor_ruby/logging/filters/
/usr/lib/ruby/vendor_ruby/logging/filters/level.rb
/usr/lib/ruby/vendor_ruby/logging/filters.rb
/usr/lib/ruby/vendor_ruby/logging/layout.rb
/usr/lib/ruby/vendor_ruby/logging/layouts/
/usr/lib/ruby/vendor_ruby/logging/layouts/basic.rb
/usr/lib/ruby/vendor_ruby/logging/layouts/parseable.rb
/usr/lib/ruby/vendor_ruby/logging/layouts/pattern.rb
/usr/lib/ruby/vendor_ruby/logging/layouts.rb
/usr/lib/ruby/vendor_ruby/logging/log_event.rb
/usr/lib/ruby/vendor_ruby/logging/logger.rb
/usr/lib/ruby/vendor_ruby/logging/proxy.rb
/usr/lib/ruby/vendor_ruby/logging/rails_compat.rb
/usr/lib/ruby/vendor_ruby/logging/repository.rb
/usr/lib/ruby/vendor_ruby/logging/root_logger.rb
/usr/lib/ruby/vendor_ruby/logging/utils.rb
/usr/lib/ruby/vendor_ruby/logging/version.rb
/usr/lib/ruby/vendor_ruby/logging.rb
/usr/lib/ruby/vendor_ruby/rspec/
/usr/lib/ruby/vendor_ruby/rspec/logging_helper.rb
/usr/lib/ruby/vendor_ruby/spec/
/usr/lib/ruby/vendor_ruby/spec/logging_helper.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-logging/
/usr/share/doc/ruby-logging/README.md.gz
/usr/share/doc/ruby-logging/changelog.Debian.gz
/usr/share/doc/ruby-logging/copyright
/usr/share/doc/ruby-logging/examples/
/usr/share/doc/ruby-logging/examples/appenders.rb
/usr/share/doc/ruby-logging/examples/classes.rb
/usr/share/doc/ruby-logging/examples/colorization.rb
/usr/share/doc/ruby-logging/examples/custom_log_levels.rb
/usr/share/doc/ruby-logging/examples/fork.rb
/usr/share/doc/ruby-logging/examples/formatting.rb
/usr/share/doc/ruby-logging/examples/hierarchies.rb
/usr/share/doc/ruby-logging/examples/layouts.rb
/usr/share/doc/ruby-logging/examples/lazy.rb
/usr/share/doc/ruby-logging/examples/loggers.rb
/usr/share/doc/ruby-logging/examples/mdc.rb
/usr/share/doc/ruby-logging/examples/names.rb
/usr/share/doc/ruby-logging/examples/rails4.rb
/usr/share/doc/ruby-logging/examples/reusing_layouts.rb
/usr/share/doc/ruby-logging/examples/rspec_integration.rb
/usr/share/doc/ruby-logging/examples/simple.rb
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/logging-2.1.0.48.gemspec