diff --git a/br/pkg/lightning/lightning.go b/br/pkg/lightning/lightning.go
index 3770f7c8f07a4..af198f4fdea58 100644
--- a/br/pkg/lightning/lightning.go
+++ b/br/pkg/lightning/lightning.go
@@ -77,6 +77,7 @@ type Lightning struct {
 
 	promFactory  promutil.Factory
 	promRegistry promutil.Registry
+	metrics      *metric.Metrics
 
 	cancelLock sync.Mutex
 	curTask    *config.Config
@@ -388,6 +389,7 @@ func (l *Lightning) run(taskCtx context.Context, taskCfg *config.Config, o *opti
 	defer func() {
 		metrics.UnregisterFrom(o.promRegistry)
 	}()
+	l.metrics = metrics
 
 	ctx := metric.NewContext(taskCtx, metrics)
 	ctx = log.NewContext(ctx, o.logger)
@@ -544,6 +546,12 @@ func (l *Lightning) Status() (finished int64, total int64) {
 	return
 }
 
+// Metrics returns the metrics of lightning.
+// it's inited during `run`, so might return nil.
+func (l *Lightning) Metrics() *metric.Metrics {
+	return l.metrics
+}
+
 func writeJSONError(w http.ResponseWriter, code int, prefix string, err error) {
 	type errorResponse struct {
 		Error string `json:"error"`