Fix alert rule route preview and irmHooks use of route api

public/app/features/alerting/unified/components/rule-editor/notificaton-preview/useAlertmanagerNotificationRoutingPreview.ts

@@ -8,18 +8,24 @@ import { useRouteGroupsMatcher } from '../../../useRouteGroupsMatcher';
 import { addUniqueIdentifierToRoute } from '../../../utils/amroutes';
 import { GRAFANA_RULES_SOURCE_NAME } from '../../../utils/datasource';
 import { normalizeRoute } from '../../../utils/notification-policies';
+import { NAMED_ROOT_LABEL_NAME } from '../../../api/routesApi';
 
 export const useAlertmanagerNotificationRoutingPreview = (alertmanager: string, instances: Labels[]) => {
+  // if a NAMED_ROOT_LABEL_NAME label exists, then we only match to that route.
+  const routeName = useMemo(() => {
+    const routeNameLabel = instances.find((instance) => instance[NAMED_ROOT_LABEL_NAME]);
+    return routeNameLabel?.[NAMED_ROOT_LABEL_NAME];
+  }, [instances]);
+
   const {
-    data: currentData,
+    data: defaultPolicy,
     isLoading: isPoliciesLoading,
     error: policiesError,
-  } = useNotificationPolicyRoute({ alertmanager });
+  } = useNotificationPolicyRoute({ alertmanager }, routeName);
 
   // this function will use a web worker to compute matching routes
   const { matchInstancesToRoutes } = useRouteGroupsMatcher();
 
-  const [defaultPolicy] = currentData ?? [];
   const rootRoute = useMemo(() => {
     if (!defaultPolicy) {
       return;

public/app/features/gops/configuration-tracker/irmHooks.ts

@@ -61,7 +61,7 @@ function useGetConfigurationForApps() {
   const { data: rootRoute, isLoading: isLoadingDefaultContactPoint } = useNotificationPolicyRoute({
     alertmanager: GRAFANA_RULES_SOURCE_NAME,
   });
-  const defaultContactpoint = rootRoute?.[0].receiver || '';
+  const defaultContactpoint = rootRoute?.receiver || '';
   const { isDone: isCreateAlertRuleDone, isLoading: isLoadingAlertCreatedDone } = useIsCreateAlertRuleDone();
   // configuration checks for incidents
   const {