code: def _find_usage_network_interfaces(self):
          
          enis = paginate_dict(
              self.conn.describe_network_interfaces,
              alc_marker_path=['NextToken'],
              alc_data_path=['NetworkInterfaces'],
              alc_marker_param='NextToken'
          )
  
          self.limits['Network interfaces per Region']._add_current_usage(
              len(enis['NetworkInterfaces']),
              aws_type='AWS::EC2::NetworkInterface'
          )
docs: find usage of network interfaces