Observer/FlushAllCacheObserver.php
public function execute(\Magento\Framework\Event\Observer $observer) // @codingStandardsIgnoreLine - unused parameter
    {
        if ($this->config->getType() == Config::FASTLY && $this->config->isEnabled()) {
            $this->purgeCache->sendPurgeRequest();
        }
    }
public function execute(\Magento\Framework\Event\Observer $observer) // @codingStandardsIgnoreLine - unused parameter
    {
        if ($this->config->getType() == Config::FASTLY && $this->config->isEnabled()) {
            $this->purgeCache->sendPurgeRequest();
        }
    }
Flush Fastly CDN cache

@param \Magento\Framework\Event\Observer $observer
@throws \Zend_Uri_Exception