Parse the output of conntrack -S
        Add the parsed metrics

def _add_conntrack_stats_metrics(self, conntrack_path, tags):
        """
        Parse the output of conntrack -S
        Add the parsed metrics
        """
        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))