Footer.php

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<?php
namespace Magento\Backend\Block\Page;

class Footer extends \Magento\Backend\Block\Template
{
    protected $_template = 'Magento_Backend::page/footer.phtml';

    protected $productMetadata;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\App\ProductMetadataInterface $productMetadata,
        array $data = []
    ) {
        $this->productMetadata = $productMetadata;
        parent::__construct($context, $data);
    }

    protected function _construct()
    {
        $this->setShowProfiler(true);
    }

    public function getMagentoVersion()
    {
        return $this->productMetadata->getVersion();
    }

    protected function getCacheLifetime()
    {
        return 3600 * 24 * 10;
    }
}