loki: run some queries through the backend (#44729)

pkg/services/featuremgmt/registry.go

@@ -72,6 +72,12 @@ var (
 			State:        FeatureStateBeta,
 			FrontendOnly: true,
 		},
+		{
+			Name:         "lokiBackendMode",
+			Description:  "Loki datasource works as backend datasource",
+			State:        FeatureStateAlpha,
+			FrontendOnly: true,
+		},
 		{
 			Name:         "fullRangeLogsVolume",
 			Description:  "Show full range logs volume in explore",

pkg/services/featuremgmt/toggles_gen.go

@@ -55,6 +55,10 @@ const (
 	// show service
 	FlagTempoServiceGraph = "tempoServiceGraph"
 
+	// FlagLokiBackendMode
+	// Loki datasource works as backend datasource
+	FlagLokiBackendMode = "lokiBackendMode"
+
 	// FlagFullRangeLogsVolume
 	// Show full range logs volume in explore
 	FlagFullRangeLogsVolume = "fullRangeLogsVolume"