Uncaught TYPO3 Exception

#1301648782: Cannot connect to the configured database. Connection failed with: "An exception occured in driver: Too many connections" (More information)

TYPO3\CMS\Core\Error\Http\ServiceUnavailableException thrown in file
/var/www/vhosts/grone.de/htdocs/releases/73/vendor/typo3/cms/typo3/sysext/frontend/Classes/Controller/TypoScriptFrontendController.php in line 934 .

 6  TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController :: connectToDB () 

/var/www/vhosts/grone.de/htdocs/releases/73/vendor/typo3/cms/typo3/sysext/frontend/Classes/Http/RequestHandler.php:

 5  TYPO3\CMS\Frontend\Http\RequestHandler :: handleRequest ( TYPO3\CMS\Core\Http\ServerRequest ) 

00317: 
00318:         // Execute the command which returns a Response object or NULL

00319:         $this->response = $requestHandler->handleRequest($request);

 4  TYPO3\CMS\Core\Core\Bootstrap :: handleRequest ( TYPO3\CMS\Core\Http\ServerRequest ) 

00077:     public function run(callable $execute = null)
00078:     {

00079:         $this->bootstrap->handleRequest(\TYPO3\CMS\Core\Http\ServerRequestFactory::fromGlobals());

00080: 
00081:         if ($execute !== null) {

 3  TYPO3\CMS\Frontend\Http\Application :: run () 

00021: call_user_func(function () {
00022:     $classLoader = require __DIR__ . '/../../../../../../vendor/autoload.php';

00023:     (new \TYPO3\CMS\Frontend\Http\Application($classLoader))->run();

00022:     $classLoader = require __DIR__ . '/../../../../../../vendor/autoload.php';
00023:     (new \TYPO3\CMS\Frontend\Http\Application($classLoader))->run();

00024: });

 1  require (" /var/www/vhosts/grone.de/htdocs/releases/73/vendor … sysext/frontend/Resources/Private/Php/frontend.php ") 

/var/www/vhosts/grone.de/htdocs/releases/73/vendor/typo3/cms/index.php:

00003: require __DIR__ . '/typo3/sysext/frontend/Resources/Private/Php/frontend.php';