# File lib/new_relic/agent/instrumentation/action_view_subscriber.rb, line 47
          def metric_name
            if parent && (payload[:virtual_path] ||
                          (parent.payload[:identifier] =~ /template$/))
              return parent.metric_name
            elsif payload.key?(:virtual_path)
              identifier = payload[:virtual_path]
            else
              identifier = payload[:identifier]
            end

            # memoize
            @metric_name ||= "View/#{metric_path(name, identifier)}/#{metric_action(name)}"
            @metric_name
          end