public function deleteAction($id)
    {
        $instance = $this->getManager()->find($id);
        if($instance) {
            $this->getManager()->delete($instance);
            $this->get('session')->getFlashBag()->add('success', 'Instance Redis has been deleted successfully');
        }else {
            $this->get('session')->getFlashBag()->add('error', 'This instance does not exist');
        }
        
        return new RedirectResponse($this->generateUrl('ringo_php_redmon'));
    }