    # 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