code: def formatted(self):
          ret = "Statistics (times in seconds, lengths in Bytes):\n"
          if self.enabled:
              snapshot = sorted(self.snapshot(),
                                key=lambda item: item[1].avg_time,
                                reverse=True)
              include_svr = False
              for name, stats in snapshot:
                  if stats._server_time_stored:
                      include_svr = True
              if include_svr:
                  ret += OperationStatistic._formatted_header_w_svr
              else:
                  ret += OperationStatistic._formatted_header
              for name, stats in snapshot:
                  ret += stats.formatted(include_svr)
          else:
              ret += "Disabled"
          return ret.strip()