@PostMapping
    public ShenyuAdminResult addReceiver(@Valid @RequestBody final AlertReceiverDTO alertReceiverDTO) {
        alertReceiverService.addReceiver(alertReceiverDTO);
        return ShenyuAdminResult.success(ShenyuResultMessage.CREATE_SUCCESS);
    }
add new alert receiver.

@param alertReceiverDTO alertReceiverDTO
@return result
shenyu-admin/src/main/java/org/apache/shenyu/admin/controller/AlertReceiverController.java