# File lib/new_relic/agent/instrumentation/rack.rb, line 116
          def self.instrument_url_map url_map_class
            url_map_class.class_eval do
              alias_method :initialize_without_newrelic, :initialize

              def initialize(map = {})
                traced_map = ::NewRelic::Agent::Instrumentation::RackURLMap.generate_traced_map(map)
                initialize_without_newrelic(traced_map)
              end
            end
          end