Loki: Remove alpha feature toggle lokiDataframeApi (#65918)

loki: remove experimental feature-flag

pkg/tsdb/loki/streaming.go

@@ -13,8 +13,6 @@ import (
 	"github.com/gorilla/websocket"
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
 	"github.com/grafana/grafana-plugin-sdk-go/data"
-
-	"github.com/grafana/grafana/pkg/services/featuremgmt"
 )
 
 func (s *Service) SubscribeStream(_ context.Context, req *backend.SubscribeStreamRequest) (*backend.SubscribeStreamResponse, error) {
@@ -84,15 +82,9 @@ func (s *Service) RunStream(ctx context.Context, req *backend.RunStreamRequest,
 	params := url.Values{}
 	params.Add("query", query.Expr)
 
-	lokiDataframeApi := s.features.IsEnabled(featuremgmt.FlagLokiDataframeApi)
-
 	wsurl, _ := url.Parse(dsInfo.URL)
 
-	if lokiDataframeApi {
-		wsurl.Path = "/loki/api/v2alpha/tail"
-	} else {
-		wsurl.Path = "/loki/api/v1/tail"
-	}
+	wsurl.Path = "/loki/api/v2alpha/tail"
 
 	if wsurl.Scheme == "https" {
 		wsurl.Scheme = "wss"
@@ -133,11 +125,7 @@ func (s *Service) RunStream(ctx context.Context, req *backend.RunStreamRequest,
 			}
 
 			frame := &data.Frame{}
-			if !lokiDataframeApi {
-				frame, err = lokiBytesToLabeledFrame(message)
-			} else {
-				err = json.Unmarshal(message, &frame)
-			}
+			err = json.Unmarshal(message, &frame)
 
 			if err == nil && frame != nil {
 				next, _ := data.FrameToJSONCache(frame)