private static function addNamespaceToCaches(array $caches)
 {
     $namespace = PhabricatorCaches::getNamespace();
     if (!$namespace) {
         return $caches;
     }
     foreach ($caches as $key => $cache) {
         $ncache = new PhutilKeyValueCacheNamespace($cache);
         $ncache->setNamespace($namespace);
         $caches[$key] = $ncache;
     }
     return $caches;
 }