rc = mbe->register_overlay( be, on, &cm->monitor_ndn );
if ( rc == 0 ) {
rc = mbe->register_entry_attrs( &cm->monitor_ndn, a, cb,
rc = mbe->register_overlay( be, on, &cm->monitor_ndn );
if ( rc == 0 ) {
rc = mbe->register_entry_attrs( &cm->monitor_ndn, a, cb,