code: def _add_conntrack_stats_metrics(self, conntrack_path, tags):
          
          try:
              output, _, _ = get_subprocess_output(["sudo", conntrack_path, "-S"], self.log)
              # conntrack -S sample:
              # cpu=0 found=27644 invalid=19060 ignore=485633411 insert=0 insert_failed=1 \
              #       drop=1 early_drop=0 error=0 search_restart=39936711
              # cpu=1 found=21960 invalid=17288 ignore=475938848 insert=0 insert_failed=1 \
              #       drop=1 early_drop=0 error=0 search_restart=36983181
  
              lines = output.splitlines()
  
              for line in lines:
                  cols = line.split()
                  cpu_num = cols[0].split('=')[-1]
                  cpu_tag = ['cpu:{}'.format(cpu_num)]
                  cols = cols[1:]
  
                  for cell in cols:
                      metric, value = cell.split('=')
                      self.monotonic_count('system.net.conntrack.{}'.format(metric), int(value), tags=tags + cpu_tag)
          except SubprocessOutputEmptyError:
              self.log.debug("Couldn't use {} to get conntrack stats".format(conntrack_path))
docs: Parse the output of conntrack -S
          Add the parsed metrics