# File lib/chef/node/attribute.rb, line 246
      def keys
        tkeys = current_automatic ? current_automatic.keys : []
        [ current_override, current_normal, current_default ].each do |attr_hash|
          if attr_hash
            attr_hash.keys.each do |key|
              tkeys << key unless tkeys.include?(key)
            end
          end
        end
        tkeys
      end