add it

beacon-chain/p2p/monitoring.go

@@ -105,7 +105,7 @@ var (
 		Name: "p2p_pubsub_reject_total",
 		Help: "The number of messages rejected of a particular topic",
 	},
-		[]string{"topic"})
+		[]string{"topic", "reason"})
 	pubsubPeerThrottle = promauto.NewCounterVec(prometheus.CounterOpts{
 		Name: "p2p_pubsub_throttle_total",
 		Help: "The number of times a peer has been throttled for a particular topic",

beacon-chain/p2p/pubsub_tracer.go

@@ -58,7 +58,7 @@ func (g gossipTracer) DeliverMessage(msg *pubsub.Message) {
 
 // RejectMessage .
 func (g gossipTracer) RejectMessage(msg *pubsub.Message, reason string) {
-	pubsubMessageReject.WithLabelValues(*msg.Topic).Inc()
+	pubsubMessageReject.WithLabelValues(*msg.Topic, reason).Inc()
 }
 
 // DuplicateMessage .