Data.php

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<?php
namespace Magento\Robots\Block;

use Magento\Framework\DataObject\IdentityInterface;
use Magento\Framework\View\Element\AbstractBlock;
use Magento\Framework\View\Element\Context;
use Magento\Robots\Model\Config\Value;
use Magento\Robots\Model\Robots;
use Magento\Store\Model\StoreResolver;
use Magento\Store\Model\StoreManagerInterface;

class Data extends AbstractBlock implements IdentityInterface
{
    private $robots;

    private $storeManager;

    public function __construct(
        Context $context,
        Robots $robots,
        StoreResolver $storeResolver,
        StoreManagerInterface $storeManager = null,
        array $data = []
    ) {
        $this->robots = $robots;
        $this->storeManager = $storeManager ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(StoreManagerInterface::class);

        parent::__construct($context, $data);
    }

    protected function _toHtml()
    {
        return $this->robots->getData() . PHP_EOL;
    }

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