fix CLI flags not pass into the receive handler

Signed-off-by: Yi Jin <[email protected]>

cmd/thanos/receive.go

@@ -256,6 +256,8 @@ func runReceive(
 		MaxBackoff:           time.Duration(*conf.maxBackoff),
 		TSDBStats:            dbs,
 		Limiter:              limiter,
+
+		AsyncForwardWorkerCount: conf.asyncForwardWorkerCount,
 	})
 
 	grpcProbe := prober.NewGRPC()

pkg/receive/handler.go

@@ -145,6 +145,7 @@ func NewHandler(logger log.Logger, o *Options) *Handler {
 	if workers == 0 {
 		workers = 1
 	}
+	level.Info(logger).Log("msg", "Starting receive handler with async forward workers", "workers", workers)
 
 	h := &Handler{
 		logger:               logger,