// - This global check key invalidates message blobs for all modules for all wikis
// in cache contexts (e.g. languages, skins). Setting a hold-off on this key could
// cause a cache stampede since no values would be stored for several seconds.
// - This global check key invalidates message blobs for all modules for all wikis
// in cache contexts (e.g. languages, skins). Setting a hold-off on this key could
// cause a cache stampede since no values would be stored for several seconds.