UsageStats: track enabled features (#47407)

* #47127: include enabled features in the usage stats reports

* #47127: convert feature names to snake cased metric names

* #47127: remove dead code

* #47127: lint fix

* #47127: convert GetUsageStats to return `map[string]interface{}`

* #47127: fix testssssssss

* #47127: fix testssssssss

pkg/services/featuremgmt/usage_stats.go

@@ -0,0 +1,21 @@
+package featuremgmt
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/grafana/grafana/pkg/services/featuremgmt/strcase"
+)
+
+func (fm *FeatureManager) GetUsageStats(ctx context.Context) map[string]interface{} {
+	enabled := fm.GetEnabled(ctx)
+	stats := make(map[string]interface{}, len(enabled))
+	for featureName := range enabled {
+		stats[asMetricName(featureName)] = 1
+	}
+	return stats
+}
+
+func asMetricName(featureName string) string {
+	return fmt.Sprintf("stats.features.%s.count", strcase.ToSnake(featureName))
+}