/usr/lib/ruby/ is in ruby-health-check 2.6.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/health_check/
/usr/lib/ruby/vendor_ruby/health_check/base_health_check.rb
/usr/lib/ruby/vendor_ruby/health_check/health_check_controller.rb
/usr/lib/ruby/vendor_ruby/health_check/health_check_routes.rb
/usr/lib/ruby/vendor_ruby/health_check/middleware_health_check.rb
/usr/lib/ruby/vendor_ruby/health_check/redis_health_check.rb
/usr/lib/ruby/vendor_ruby/health_check/resque_health_check.rb
/usr/lib/ruby/vendor_ruby/health_check/s3_health_check.rb
/usr/lib/ruby/vendor_ruby/health_check/sidekiq_health_check.rb
/usr/lib/ruby/vendor_ruby/health_check/utils.rb
/usr/lib/ruby/vendor_ruby/health_check/version.rb
/usr/lib/ruby/vendor_ruby/health_check.rb