rgw/notification: remove non x-amz-meta-* attributes from the metadat…

…a section of the regular notifications

Signed-off-by: Juan Zhu <jzhu4@dev-10-34-20-139.pw1.bcc.bloomberg.com>

src/rgw/driver/rados/rgw_notify.cc

@@ -711,7 +711,11 @@ static inline void populate_event(reservation_t& res,
     // either no metadata exist or no metadata filter was used
     metadata_from_attributes(res, obj);
   }
-  event.x_meta_map = res.x_meta_map;
+  std::copy_if(res.x_meta_map.cbegin(), res.x_meta_map.cend(),
+               std::inserter(event.x_meta_map, event.x_meta_map.end()),
+               [](const auto& m) {
+                 return (m.first.rfind("x-amz-meta-", 0) == 0);
+               });
   // pass tags
   if (!res.tagset ||
       (*res.tagset).get_tags().empty()) {