code: def create_a10_device_instance(self, context, a10_device_instance):
          
          LOG.debug("A10DeviceInstancePlugin.create(): a10_device_instance=%s", a10_device_instance)
  
          config = a10_config.A10Config()
          vthunder_defaults = config.get_vthunder_config()
  
          imgr = instance_manager.InstanceManager.from_config(config, context)
  
          dev_instance = common_resources.remove_attributes_not_specified(
              a10_device_instance.get(resources.RESOURCE))
  
          # Create the instance with specified defaults.
          vthunder_config = vthunder_defaults.copy()
          vthunder_config.update(_convert(dev_instance, _API, _VTHUNDER_CONFIG))
          instance = imgr.create_device_instance(vthunder_config, dev_instance.get("name"))
  
          db_record = {}
          db_record.update(_convert(vthunder_config, _VTHUNDER_CONFIG, _DB))
          db_record.update(_convert(dev_instance, _API, _DB))
          db_record.update(_convert(instance, _INSTANCE, _DB))
  
          # If success, return the created DB record
          # Else, raise an exception because that's what we would do anyway
          db_instance = super(A10DeviceInstancePlugin, self).create_a10_device_instance(
              context, {resources.RESOURCE: db_record})
  
          return _make_api_dict(db_instance)
docs: Attempt to create instance using neutron context