FS: Remove multiTenantFrontend flag (#110776)

* FS: Move multiTenantFrontend evaluation to OpenFeature

* comment

* actually, just remove the toggle

* fix k8s prefs test using toggle

* replace frontend flag usage

* codeowners

* move isFrontendService just into core

* put back comment

pkg/services/featuremgmt/registry.go

@@ -1664,13 +1664,6 @@ var (
 			FrontendOnly: false,
 			Owner:        grafanaPluginsPlatformSquad,
 		},
-		{
-			Name:         "multiTenantFrontend",
-			Description:  "Register MT frontend",
-			Stage:        FeatureStageExperimental,
-			FrontendOnly: false,
-			Owner:        grafanaFrontendPlatformSquad,
-		},
 		{
 			Name:         "alertingListViewV2PreviewToggle",
 			Description:  "Enables the alerting list view v2 preview toggle",

pkg/services/featuremgmt/toggles_gen.csv

@@ -216,7 +216,6 @@ grafanaAssistantInProfilesDrilldown,GA,@grafana/observability-traces-and-profili
 postgresDSUsePGX,experimental,@grafana/oss-big-tent,false,false,false
 tempoAlerting,experimental,@grafana/observability-traces-and-profiling,false,false,true
 pluginsAutoUpdate,experimental,@grafana/plugins-platform-backend,false,false,false
-multiTenantFrontend,experimental,@grafana/grafana-frontend-platform,false,false,false
 alertingListViewV2PreviewToggle,privatePreview,@grafana/alerting-squad,false,false,true
 alertRuleUseFiredAtForStartsAt,experimental,@grafana/alerting-squad,false,false,false
 alertingBulkActionsInUI,GA,@grafana/alerting-squad,false,false,true

pkg/services/featuremgmt/toggles_gen.go

@@ -875,10 +875,6 @@ const (
 	// Enables auto-updating of users installed plugins
 	FlagPluginsAutoUpdate = "pluginsAutoUpdate"
 
-	// FlagMultiTenantFrontend
-	// Register MT frontend
-	FlagMultiTenantFrontend = "multiTenantFrontend"
-
 	// FlagAlertingListViewV2PreviewToggle
 	// Enables the alerting list view v2 preview toggle
 	FlagAlertingListViewV2PreviewToggle = "alertingListViewV2PreviewToggle"

pkg/services/featuremgmt/toggles_gen.json

@@ -2229,7 +2229,8 @@
       "metadata": {
         "name": "multiTenantFrontend",
         "resourceVersion": "1753448760331",
-        "creationTimestamp": "2025-04-25T09:24:25Z"
+        "creationTimestamp": "2025-04-25T09:24:25Z",
+        "deletionTimestamp": "2025-09-08T17:06:39Z"
       },
       "spec": {
         "description": "Register MT frontend",

pkg/services/frontend/index.html

@@ -252,7 +252,7 @@
           const rawBootData = await loadBootData();
 
           window.grafanaBootData = {
-            _femt: true,
+            _femt: true, // isFrontendService() needs this
             ...rawBootData,
           }