notify: log level set to warning if fails

src/knot/zone/events.c

@@ -501,7 +501,7 @@ static int event_notify(zone_t *zone)
 			ZONE_QUERY_LOG(LOG_INFO, zone, iface, "NOTIFY", "sent (serial %u).",
 			               zone_contents_serial(zone->contents));
 		} else {
-			ZONE_QUERY_LOG(LOG_ERR, zone, iface, "NOTIFY", "%s", knot_strerror(ret));
+			ZONE_QUERY_LOG(LOG_WARNING, zone, iface, "NOTIFY", "%s", knot_strerror(ret));
 		}
 	}