diff --git a/commafeed-client/src/pages/admin/MetricsPage.tsx b/commafeed-client/src/pages/admin/MetricsPage.tsx
index 64203a4d..ae5a86a9 100644
--- a/commafeed-client/src/pages/admin/MetricsPage.tsx
+++ b/commafeed-client/src/pages/admin/MetricsPage.tsx
@@ -20,6 +20,8 @@ const shownGauges: { [key: string]: string } = {
     "com.commafeed.backend.feed.FeedRefreshEngine.queue.size": "Queue size",
     "com.commafeed.backend.feed.FeedRefreshEngine.worker.active": "Feed Worker active",
     "com.commafeed.backend.feed.FeedRefreshEngine.updater.active": "Feed Updater active",
+    "com.commafeed.frontend.ws.WebSocketSessions.users": "WebSocket users",
+    "com.commafeed.frontend.ws.WebSocketSessions.sessions": "WebSocket sessions",
 }
 
 export function MetricsPage() {
diff --git a/commafeed-server/src/main/java/com/commafeed/frontend/ws/WebSocketSessions.java b/commafeed-server/src/main/java/com/commafeed/frontend/ws/WebSocketSessions.java
index f52e4673..c2fb1ea5 100644
--- a/commafeed-server/src/main/java/com/commafeed/frontend/ws/WebSocketSessions.java
+++ b/commafeed-server/src/main/java/com/commafeed/frontend/ws/WebSocketSessions.java
@@ -5,9 +5,12 @@ import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.stream.Collectors;
 
+import javax.inject.Inject;
 import javax.inject.Singleton;
 import javax.websocket.Session;
 
+import com.codahale.metrics.Gauge;
+import com.codahale.metrics.MetricRegistry;
 import com.commafeed.backend.model.User;
 
 import lombok.extern.slf4j.Slf4j;
@@ -19,6 +22,13 @@ public class WebSocketSessions {
 	// a user may have multiple sessions (two tabs, on mobile, ...)
 	private final Map<Long, Set<Session>> sessions = new ConcurrentHashMap<>();
 
+	@Inject
+	public WebSocketSessions(MetricRegistry metrics) {
+		metrics.register(MetricRegistry.name(getClass(), "users"), (Gauge<Integer>) sessions::size);
+		metrics.register(MetricRegistry.name(getClass(), "sessions"),
+				(Gauge<Long>) () -> sessions.values().stream().mapToLong(Set::size).sum());
+	}
+
 	public void add(Long userId, Session session) {
 		sessions.computeIfAbsent(userId, v -> ConcurrentHashMap.newKeySet()).add(session);
 	}