MetricsDrilldown: Advance exploreMetricsUseExternalAppPlugin to GA (#103653)

chore: advance `exploreMetricsUseExternalAppPlugin` to GA

pkg/services/featuremgmt/registry.go

@@ -1554,8 +1554,9 @@ var (
 		{
 			Name:            "exploreMetricsUseExternalAppPlugin",
 			Description:     "Use the externalized Grafana Metrics Drilldown (formerly known as Explore Metrics) app plugin",
-			Stage:           FeatureStagePublicPreview,
+			Stage:           FeatureStageGeneralAvailability,
 			Owner:           grafanaObservabilityMetricsSquad,
+			Expression:      "true",
 			FrontendOnly:    false,
 			RequiresRestart: true,
 		},

pkg/services/featuremgmt/toggles_gen.csv

@@ -204,7 +204,7 @@ templateVariablesUsesCombobox,experimental,@grafana/grafana-frontend-platform,fa
 ABTestFeatureToggleB,experimental,@grafana/sharing-squad,false,false,false
 grafanaAdvisor,experimental,@grafana/plugins-platform-backend,false,false,false
 elasticsearchImprovedParsing,experimental,@grafana/aws-datasources,false,false,false
-exploreMetricsUseExternalAppPlugin,preview,@grafana/observability-metrics,false,true,false
+exploreMetricsUseExternalAppPlugin,GA,@grafana/observability-metrics,false,true,false
 datasourceConnectionsTab,privatePreview,@grafana/plugins-platform-backend,false,false,true
 fetchRulesUsingPost,experimental,@grafana/alerting-squad,false,false,false
 newLogsPanel,experimental,@grafana/observability-logs,false,false,true

pkg/services/featuremgmt/toggles_gen.json

@@ -1117,14 +1117,18 @@
     {
       "metadata": {
         "name": "exploreMetricsUseExternalAppPlugin",
-        "resourceVersion": "1743693517832",
-        "creationTimestamp": "2025-04-03T15:18:37Z"
+        "resourceVersion": "1744146547481",
+        "creationTimestamp": "2025-04-03T15:18:37Z",
+        "annotations": {
+          "grafana.app/updatedTimestamp": "2025-04-08 21:09:07.481769 +0000 UTC"
+        }
       },
       "spec": {
         "description": "Use the externalized Grafana Metrics Drilldown (formerly known as Explore Metrics) app plugin",
-        "stage": "preview",
+        "stage": "GA",
         "codeowner": "@grafana/observability-metrics",
-        "requiresRestart": true
+        "requiresRestart": true,
+        "expression": "true"
       }
     },
     {