Collect metrics about connections state using psutil

def _cx_state_psutil(self, tags=None):
        """
        Collect metrics about connections state using psutil
        """
        metrics = defaultdict(int)
        tags = [] if tags is None else tags
        for conn in psutil.net_connections():
            protocol = self._parse_protocol_psutil(conn)
            status = self.tcp_states['psutil'].get(conn.status)
            metric = self.cx_state_gauge.get((protocol, status))
            if metric is None:
                self.log.warning('Metric not found for: %s,%s', protocol, status)
            else:
                metrics[metric] += 1

        for metric, value in iteritems(metrics):
            self.gauge(metric, value, tags=tags)