# File lib/new_relic/agent/instrumentation/memcache/dalli.rb, line 36
          def instrument_server_for_key
            ::Dalli::Ring.class_eval do
              alias_method :server_for_key_without_newrelic_trace, :server_for_key

              def server_for_key key
                server = server_for_key_without_newrelic_trace key
                begin
                  if txn = ::NewRelic::Agent::Transaction.tl_current
                    segment = txn.current_segment
                    if ::NewRelic::Agent::Transaction::DatastoreSegment === segment
                      ::NewRelic::Agent::Instrumentation::Memcache::Dalli.assign_instance_to(segment, server)
                    end
                  end
                rescue => e
                  ::NewRelic::Agent.logger.warn "Unable to set instance info on datastore segment: #{e.message}"
                end
                server
              end
            end
          end