update metrics

(cherry picked from commit 720600ef62)

internal/p2p/metrics.go

@@ -27,7 +27,7 @@ var (
 
 // Metrics contains metrics exposed by this package.
 type Metrics struct {
-	// Number of peers.
+	// Number of peers connected.
 	Peers            metrics.Gauge
 	PeersStored      metrics.Gauge
 	PeersInactivated metrics.Gauge

internal/p2p/peermanager.go

@@ -711,6 +711,9 @@ func (m *PeerManager) Accepted(peerID types.NodeID) error {
 		}
 	}
 
+	if peer.Inactive {
+		m.metrics.PeersInactivated.Add(-1)
+	}
 	peer.Inactive = false
 	peer.LastConnected = time.Now().UTC()
 	if err := m.store.Set(peer); err != nil {