diff --git a/rafthttp/peer.go b/rafthttp/peer.go
index 58b51f034..e3093f81d 100644
--- a/rafthttp/peer.go
+++ b/rafthttp/peer.go
@@ -230,6 +230,7 @@ func (p *peer) send(m raftpb.Message) {
 			plog.MergeWarningf("dropped internal raft message to %s since %s's sending buffer is full (bad/overloaded network)", p.id, name)
 		}
 		plog.Debugf("dropped %s to %s since %s's sending buffer is full", m.Type, p.id, name)
+		sentFailures.WithLabelValues(types.ID(m.To).String()).Inc()
 	}
 }
 
diff --git a/rafthttp/remote.go b/rafthttp/remote.go
index c62c81823..f7f9d2ceb 100644
--- a/rafthttp/remote.go
+++ b/rafthttp/remote.go
@@ -53,6 +53,7 @@ func (g *remote) send(m raftpb.Message) {
 			plog.MergeWarningf("dropped internal raft message to %s since sending buffer is full (bad/overloaded network)", g.id)
 		}
 		plog.Debugf("dropped %s to %s since sending buffer is full", m.Type, g.id)
+		sentFailures.WithLabelValues(types.ID(m.To).String()).Inc()
 	}
 }