Alerting: Add support for alpha rules apis in legacy storage

Rules created in the new api makes the rule have no group in the database, but the rule is returned in the old group api with a sentinel group name formatted with the rule uid for compatiblity with the old api.
This makes the UI continue to work with the rules without a group, and the ruler will continue to work with the rules without a group.

Rules are not allowed to be created in the provisioning api with a NoGroup sentinel mask, but NoGroup rules can be manipulated through both the new and old apis.

Co-authored-by: William Wernert <william.wernert@grafana.com>

pkg/services/featuremgmt/registry.go

@@ -462,6 +462,13 @@ var (
 			Owner:           grafanaAppPlatformSquad,
 			RequiresRestart: true, // changes the API routing
 		},
+		{
+			Name:            "kubernetesAlertingRules",
+			Description:     "Adds support for Kubernetes alerting and recording rules",
+			Stage:           FeatureStageExperimental,
+			Owner:           grafanaAlertingSquad,
+			RequiresRestart: true,
+		},
 		{
 			Name:        "dashboardDisableSchemaValidationV1",
 			Description: "Disable schema validation for dashboards/v1",

pkg/services/featuremgmt/toggles_gen.csv

@@ -59,6 +59,7 @@ kubernetesSnapshots,experimental,@grafana/grafana-app-platform-squad,false,true,
 kubernetesLibraryPanels,experimental,@grafana/grafana-app-platform-squad,false,true,false
 kubernetesDashboards,GA,@grafana/dashboards-squad,false,false,true
 kubernetesShortURLs,experimental,@grafana/grafana-app-platform-squad,false,true,false
+kubernetesAlertingRules,experimental,@grafana/alerting-squad,false,true,false
 dashboardDisableSchemaValidationV1,experimental,@grafana/grafana-app-platform-squad,false,false,false
 dashboardDisableSchemaValidationV2,experimental,@grafana/grafana-app-platform-squad,false,false,false
 dashboardSchemaValidationLogging,experimental,@grafana/grafana-app-platform-squad,false,false,false

pkg/services/featuremgmt/toggles_gen.go

@@ -247,6 +247,10 @@ const (
 	// Routes short url requests from /api to the /apis endpoint
 	FlagKubernetesShortURLs = "kubernetesShortURLs"
 
+	// FlagKubernetesAlertingRules
+	// Adds support for Kubernetes alerting and recording rules
+	FlagKubernetesAlertingRules = "kubernetesAlertingRules"
+
 	// FlagDashboardDisableSchemaValidationV1
 	// Disable schema validation for dashboards/v1
 	FlagDashboardDisableSchemaValidationV1 = "dashboardDisableSchemaValidationV1"

pkg/services/featuremgmt/toggles_gen.json

@@ -1908,6 +1908,19 @@
         "requiresRestart": true
       }
     },
+    {
+      "metadata": {
+        "name": "kubernetesAlertingRules",
+        "resourceVersion": "1754340669702",
+        "creationTimestamp": "2025-08-04T20:51:09Z"
+      },
+      "spec": {
+        "description": "Adds support for Kubernetes alerting and recording rules",
+        "stage": "experimental",
+        "codeowner": "@grafana/alerting-squad",
+        "requiresRestart": true
+      }
+    },
     {
       "metadata": {
         "name": "kubernetesAuthnMutation",