Robots.php

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<?php
namespace Magento\Sitemap\Model\Config\Backend;

use Magento\Framework\App\Cache\TypeListInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\Config\Value;
use Magento\Framework\Data\Collection\AbstractDb;
use Magento\Framework\DataObject\IdentityInterface;
use Magento\Framework\Model\Context;
use Magento\Framework\Model\ResourceModel\AbstractResource;
use Magento\Framework\Registry;
use Magento\Robots\Model\Config\Value as RobotsValue;
use Magento\Store\Model\StoreResolver;
use Magento\Store\Model\StoreManagerInterface;

class Robots extends Value implements IdentityInterface
{
    protected $_cacheTag = true;

    private $storeManager;

    public function __construct(
        Context $context,
        Registry $registry,
        ScopeConfigInterface $config,
        TypeListInterface $cacheTypeList,
        StoreResolver $storeResolver,
        StoreManagerInterface $storeManager = null,
        AbstractResource $resource = null,
        AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->storeManager = $storeManager ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(StoreManagerInterface::class);

        parent::__construct(
            $context,
            $registry,
            $config,
            $cacheTypeList,
            $resource,
            $resourceCollection,
            $data
        );
    }

    public function getIdentities()
    {
        return [
            RobotsValue::CACHE_TAG . '_' . $this->storeManager->getStore()->getId(),
        ];
    }
}