Alerting: Allow selecting only ... in groupBy (#80857)

Allow selecting only ... in groupBy

public/app/features/alerting/unified/components/rule-editor/alert-rule-form/simplifiedRouting/route-settings/RouteSettings.tsx

@@ -45,6 +45,7 @@ export const RoutingSettings = ({ alertManager }: RoutingSettingsProps) => {
   const overrideGrouping = watch(`contactPoints.${alertManager}.overrideGrouping`);
   const overrideTimings = watch(`contactPoints.${alertManager}.overrideTimings`);
   const requiredFieldsInGroupBy = ['grafana_folder', 'alertname'];
+  const disableGrouping = '...';
   const styles = useStyles2(getStyles);
   return (
     <Stack direction="column">
@@ -72,6 +73,10 @@ export const RoutingSettings = ({ alertManager }: RoutingSettingsProps) => {
                 if (!value || value.length === 0) {
                   return 'At least one group by option is required.';
                 }
+                // if value includes only the allowedSingleFieldInGroupBy, it is valid
+                if (value.length === 1 && value[0] === disableGrouping) {
+                  return true;
+                }
                 // we need to make sure that the required fields are included
                 const requiredFieldsIncluded = requiredFieldsInGroupBy.every((field) => value.includes(field));
                 if (!requiredFieldsIncluded) {