# File lib/new_relic/agent/transaction/trace.rb, line 51
        def create_node(time_since_start, metric_name = nil)
          raise FinishedTraceError.new "Can't create additional node for finished trace." if self.finished
          self.node_count += 1
          NewRelic::Agent::Transaction::TraceNode.new(time_since_start, metric_name)
        end