/**
     * Notifies managing contact about updated metadata of entity
     *
     * @param   sspmod_janus_Entity $entity
     * @param   string $metadataXml
     * @return void
     */
    protected function _mailUpdatedMetaData(sspmod_janus_Entity $entity, $metadataXml)
    {
        $config = SimpleSAML_Configuration::getInstance();
        $time = date(DATE_RFC822);
        $entityName = $entity->getPrettyname();
        $entityId = $entity->getEntityId();
        $message = <<<MESSAGE
<h1>Metadata Change detected</h1>
<p>Cron ran at {$time}</p>
<p>Name: {$entityName}</p>
<p>EntityId: {$entityId}</p>
MESSAGE;
        $toAddress = $config->getString('managingcontact_email');
        if (empty($toAddress)) {
            SimpleSAML_Logger::error('Cron - Could not send email. [managingcontact_email] not set in config.');
        }
        $fromAddress = '*****@*****.**';
        $subject = "Metadata Change detected for entity " . $entity->getPrettyname() . " (" . $entity->getEntityId() . "])";
        $email = new SimpleSAML_XHTML_EMail($toAddress, $subject, $fromAddress);
        $email->setBody($message);
        // Add gzipped metadata
        $attachmentContent = gzencode($metadataXml);
        $attachmentFileName = 'metadata-' . $entityName . '.xml.gz';
        $email->addAttachment($attachmentContent, $attachmentFileName, 'application/zip');
        $email->send();
    }