private static function countStats($streamers, $sort_by_load = false)
 {
     $streamers = array_map(function ($streamer) {
         $streamer['sessions'] = StreamServer::getStreamerSessions($streamer['id']);
         $streamer['load'] = StreamServer::getLoad($streamer['id'], $streamer['sessions']);
         return $streamer;
     }, $streamers);
     if ($sort_by_load) {
         $streamers = self::sortByLoad($streamers);
     }
     return $streamers;
 }