Controller/Adminhtml/FastlyCdn/Maintenance/CheckSuSetting.php
public function execute()
    {
        $result = $this->resultJsonFactory->create();
        try {
            $service = $this->api->checkServiceDetails();
            $currActiveVersion = $this->vcl->getCurrentVersion($service->versions);

            $dictionaryName = Config::CONFIG_DICTIONARY_NAME;
            $dictionary = $this->api->getSingleDictionary($currActiveVersion, $dictionaryName);

            if (!$dictionary) {
                return $result->setData([
                    'status' => false
                ]);
            }

            $dictionaryItems = $this->api->dictionaryItemsList($dictionary->id);

            foreach ($dictionaryItems as $item) {
                if ($item->item_key == Config::CONFIG_DICTIONARY_KEY && $item->item_value == 1) {
                    return $result->setData([
                        'status' => true
                    ]);
                }
            }

            return $result->setData([
                'status' => false
            ]);
        } catch (\Exception $e) {
            return $result->setData([
                'status'    => false,
                'msg'       => $e->getMessage()
            ]);
        }
    }
public function execute()
    {
        $result = $this->resultJsonFactory->create();
        try {
            $service = $this->api->checkServiceDetails();
            $currActiveVersion = $this->vcl->getCurrentVersion($service->versions);

            $dictionaryName = Config::CONFIG_DICTIONARY_NAME;
            $dictionary = $this->api->getSingleDictionary($currActiveVersion, $dictionaryName);

            if (!$dictionary) {
                return $result->setData([
                    'status' => false
                ]);
            }

            $dictionaryItems = $this->api->dictionaryItemsList($dictionary->id);

            foreach ($dictionaryItems as $item) {
                if ($item->item_key == Config::CONFIG_DICTIONARY_KEY && $item->item_value == 1) {
                    return $result->setData([
                        'status' => true
                    ]);
                }
            }

            return $result->setData([
                'status' => false
            ]);
        } catch (\Exception $e) {
            return $result->setData([
                'status'    => false,
                'msg'       => $e->getMessage()
            ]);
        }
    }
Verifies whether super users are enabled in the magentomodule_config dictionary

@return \Magento\Framework\Controller\Result\Json