diff --git a/metrics.go b/metrics.go
index 89514d7..156ed0f 100644
--- a/metrics.go
+++ b/metrics.go
@@ -55,10 +55,12 @@ type MetricsHandler struct {
 	unencryptedGroupCount   prometheus.Gauge
 	unencryptedPrivateCount prometheus.Gauge
 
-	connected      prometheus.Gauge
-	connectedState map[types.WhatsAppID]bool
-	loggedIn       prometheus.Gauge
-	loggedInState  map[types.WhatsAppID]bool
+	connected       prometheus.Gauge
+	connectedState  map[types.WhatsAppID]bool
+	loggedIn        prometheus.Gauge
+	loggedInState   map[types.WhatsAppID]bool
+	syncLocked      prometheus.Gauge
+	syncLockedState map[types.WhatsAppID]bool
 }
 
 func NewMetricsHandler(address string, log log.Logger, db *database.Database) *MetricsHandler {
@@ -112,6 +114,11 @@ func NewMetricsHandler(address string, log log.Logger, db *database.Database) *M
 			Help: "Bridge users connected to WhatsApp",
 		}),
 		connectedState: make(map[types.WhatsAppID]bool),
+		syncLocked: promauto.NewGauge(prometheus.GaugeOpts{
+			Name: "bridge_sync_locked",
+			Help: "Bridge users locked in post-login sync",
+		}),
+		syncLockedState: make(map[types.WhatsAppID]bool),
 	}
 }
 
@@ -167,6 +174,21 @@ func (mh *MetricsHandler) TrackConnectionState(jid types.WhatsAppID, connected b
 	}
 }
 
+func (mh *MetricsHandler) TrackSyncLock(jid types.WhatsAppID, locked bool) {
+	if !mh.running {
+		return
+	}
+	currentVal, ok := mh.syncLockedState[jid]
+	if !ok || currentVal != locked {
+		mh.syncLockedState[jid] = locked
+		if locked {
+			mh.syncLocked.Inc()
+		} else {
+			mh.syncLocked.Dec()
+		}
+	}
+}
+
 func (mh *MetricsHandler) updateStats() {
 	start := time.Now()
 	var puppetCount int
diff --git a/user.go b/user.go
index 7132588..e726bbb 100644
--- a/user.go
+++ b/user.go
@@ -798,7 +798,9 @@ func (user *User) handleMessageLoop() {
 			user.GetPortalByJID(msg.chat).messages <- msg
 		case <-user.syncStart:
 			user.log.Debugln("Processing of incoming messages is locked")
+			user.bridge.Metrics.TrackSyncLock(user.JID, true)
 			user.syncWait.Wait()
+			user.bridge.Metrics.TrackSyncLock(user.JID, false)
 			user.log.Debugln("Processing of incoming messages unlocked")
 		}
 	}