Messages.php

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<?php
namespace Magento\AdminNotification\Block\System;

class Messages extends \Magento\Backend\Block\Template
{
    protected $_messages;

    protected $jsonHelper;

    private $serializer;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\AdminNotification\Model\ResourceModel\System\Message\Collection\Synchronized $messages,
        \Magento\Framework\Json\Helper\Data $jsonHelper,
        array $data = [],
        \Magento\Framework\Serialize\Serializer\Json $serializer = null
    ) {
        $this->jsonHelper = $jsonHelper;
        parent::__construct($context, $data);
        $this->_messages = $messages;
        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
    }

    protected function _toHtml()
    {
        if (count($this->_messages->getItems())) {
            return parent::_toHtml();
        }
        return '';
    }

    public function getLastCritical()
    {
        $items = array_values($this->_messages->getItems());
        if (isset(
            $items[0]
        ) && $items[0]->getSeverity() == \Magento\Framework\Notification\MessageInterface::SEVERITY_CRITICAL
        ) {
            return $items[0];
        }
        return null;
    }

    public function getCriticalCount()
    {
        return $this->_messages->getCountBySeverity(
            \Magento\Framework\Notification\MessageInterface::SEVERITY_CRITICAL
        );
    }

    public function getMajorCount()
    {
        return $this->_messages->getCountBySeverity(
            \Magento\Framework\Notification\MessageInterface::SEVERITY_MAJOR
        );
    }

    public function hasMessages()
    {
        return (bool)count($this->_messages->getItems());
    }

    protected function _getMessagesUrl()
    {
        return $this->getUrl('adminhtml/system_message/list');
    }

    public function getSystemMessageDialogJson()
    {
        return $this->serializer->serialize(
            [
                'systemMessageDialog' => [
                    'buttons' => [],
                    'modalClass' => 'ui-dialog-active ui-popup-message modal-system-messages',
                    'ajaxUrl' => $this->_getMessagesUrl()
                ],
            ]
        );
    }
}