Prometheus: Create feature flag to disable exemplar sampling (#60105)

:Fix rebase

pkg/services/featuremgmt/registry.go

@@ -382,6 +382,11 @@ var (
 			Description: "Enable using remote cache for user sessions",
 			State:       FeatureStateAlpha,
 		},
+		{
+			Name:        "disablePrometheusExemplarSampling",
+			Description: "Disable Prometheus examplar sampling",
+			State:       FeatureStateStable,
+		},
 		{
 			Name:        "alertingBacktesting",
 			Description: "Rule backtesting API for alerting",

pkg/services/featuremgmt/toggles_gen.go

@@ -279,6 +279,10 @@ const (
 	// Enable using remote cache for user sessions
 	FlagSessionRemoteCache = "sessionRemoteCache"
 
+	// FlagDisablePrometheusExemplarSampling
+	// Disable Prometheus examplar sampling
+	FlagDisablePrometheusExemplarSampling = "disablePrometheusExemplarSampling"
+
 	// FlagAlertingBacktesting
 	// Rule backtesting API for alerting
 	FlagAlertingBacktesting = "alertingBacktesting"