fix syntax

openstack/limes/alerts/openstack/api.alerts

@@ -312,7 +312,7 @@ groups:
 
   - alert: OpenstackLimesCinderCapacityWithUnknownVolumeType
     # NOTE: This alert is disabled in QA because Tempest runs create private volume types all the time.
-    expr: 'sum by (project_id) ((liquid_cinder_snapshots_with_unknown_volume_type_size{region!~"qa.*"} > 0) + (liquid_cinder_volumes_with_unknown_volume_type_size{region!~"qa.*"} > 0))
+    expr: 'sum by (project_id) ((liquid_cinder_snapshots_with_unknown_volume_type_size{region!~"qa.*"} > 0) + (liquid_cinder_volumes_with_unknown_volume_type_size{region!~"qa.*"} > 0))'
     for: 15m
     labels:
       severity: warning