# File lib/new_relic/agent/instrumentation/rails3/action_controller.rb, line 39
            def template_metric(identifier, options = {})
              if options[:file]
                "file"
              elsif identifier.nil?
                ::NewRelic::Agent::UNKNOWN_METRIC
              elsif identifier.include? '/' # this is a filepath
                identifier.split('/')[-2..-1].join('/')
              else
                identifier
              end
            end