diff --git a/pkg/util/validation/validate.go b/pkg/util/validation/validate.go
index 0c96a417c4ce..b6c518232f7c 100644
--- a/pkg/util/validation/validate.go
+++ b/pkg/util/validation/validate.go
@@ -29,5 +29,5 @@ var DiscardedSamples = prometheus.NewCounterVec(
 )
 
 func init() {
-	prometheus.MustRegister(DiscardedSamples)
+	prometheus.MustRegister(DiscardedSamples, DiscardedBytes)
 }