AddDirtyRulesNotice.php

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<?php
namespace Magento\CatalogRule\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;

class AddDirtyRulesNotice implements ObserverInterface
{
    private $messageManager;

    public function __construct(\Magento\Framework\Message\ManagerInterface $messageManager)
    {
        $this->messageManager = $messageManager;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $dirtyRules = $observer->getData('dirty_rules');
        if (!empty($dirtyRules)) {
            if ($dirtyRules->getState()) {
                $this->messageManager->addNoticeMessage($observer->getData('message'));
            }
        }
    }
}