ReportSystemCacheFlushToNewRelic.php

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<?php
namespace Magento\NewRelicReporting\Model\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\NewRelicReporting\Model\Config;

class ReportSystemCacheFlushToNewRelic implements ObserverInterface
{
    protected $config;

    protected $backendAuthSession;

    protected $deploymentsFactory;

    public function __construct(
        Config $config,
        \Magento\Backend\Model\Auth\Session $backendAuthSession,
        \Magento\NewRelicReporting\Model\Apm\DeploymentsFactory $deploymentsFactory
    ) {
        $this->config = $config;
        $this->backendAuthSession = $backendAuthSession;
        $this->deploymentsFactory = $deploymentsFactory;
    }

    public function execute(Observer $observer)
    {
        if ($this->config->isNewRelicEnabled()) {
            $user = $this->backendAuthSession->getUser();
            if ($user->getId()) {
                $this->deploymentsFactory->create()->setDeployment(
                    'Cache Flush',
                    $user->getUserName() . ' flushed the cache.',
                    $user->getUserName()
                );
            }
        }
    }
}