dmz_zmd_warn
dmz_zmd_warn(zmd, "Zone %u is offline", zone->id);
dmz_zmd_warn(zmd, "Zone %u has metadata", zone->id);
dmz_zmd_warn(zmd, "Zone %u: weight %u should be <= %u",
dmz_zmd_warn(zmd, "Zone %u: weight %u should be >= %u",
dmz_zmd_warn(zmd, "mblock %llu still in dirty list (ref %u)",
dmz_zmd_warn(zmd, "mblock %llu ref %u still in rbtree",