public function getSiteIdsHavingAlerts()
{
$siteIds = SitesManagerApi::getInstance()->getAllSitesId();
$model = new Model();
$alerts = $model->getAlerts($siteIds);
$siteIdsHavingAlerts = array();
foreach ($alerts as $alert) {
$siteIdsHavingAlerts = array_merge($siteIdsHavingAlerts, $alert['id_sites']);
}
return array_values(array_unique($siteIdsHavingAlerts));
}
