Bring Back Realtime Table Stats

app.js

@@ -125,6 +125,8 @@ manager.on('disconnect', (conn) => {
   }
   if (!manager.active?.connected) {
     updateHealthBadge(null);
+    lastStatsInterestSent = null;
+    lastStatsInterestPeerId = null;
   }
   refreshFleetIfVisible();
   if (isBootRestoring) return;
@@ -133,6 +135,8 @@ manager.on('disconnect', (conn) => {
   if (!hasActiveConnection()) {
     resetContainerList();
     stopStatsInterval();
+    lastStatsInterestSent = null;
+    lastStatsInterestPeerId = null;
     if (typeof manager.isReconnecting === 'function' && manager.isReconnecting()) {
       // reconnecting banner is driven by 'reconnecting' events
       return;
@@ -160,6 +164,26 @@ manager.on('connect', (conn) => {
       { latency: conn.latency, docker: conn.dockerHealth, status: conn.healthStatus },
       conn
     );
+    // Re-declare view interest after (re)connect so stats streams resume if needed
+    lastStatsInterestSent = null;
+    lastStatsInterestPeerId = null;
+    try {
+      syncStatsInterest({ force: true });
+    } catch {
+      // ignore
+    }
+  }
+});
+manager.on('active', (conn) => {
+  // Switching fleet peer: re-send interest to the new active host
+  lastStatsInterestSent = null;
+  lastStatsInterestPeerId = null;
+  if (conn?.connected) {
+    try {
+      syncStatsInterest({ force: true });
+    } catch {
+      // ignore
+    }
   }
 });
 /** Throttle reconnect notices (standard mode only) */
@@ -419,6 +443,66 @@ function startStatsInterval() {
   stopStatsInterval();
 }
 
+/**
+ * Views that show live per-container CPU/memory (table or dashboard KPIs).
+ * Server only opens Docker stats streams while ≥1 peer reports interest.
+ */
+const STATS_INTEREST_VIEWS = new Set(['containers', 'dashboard', 'container-details']);
+
+/** @type {boolean|null} last interest sent for active peer (avoid spam) */
+let lastStatsInterestSent = null;
+/** @type {string|null} peer id we last told */
+let lastStatsInterestPeerId = null;
+
+/**
+ * Tell the active peer whether this UI needs live fleet stats.
+ * Call on view change and after connect. Leaving Containers/Dashboard tears
+ * down server-side Docker stats streams for this client.
+ * @param {{ force?: boolean }} [opts]
+ */
+function syncStatsInterest(opts = {}) {
+  const force = opts.force === true;
+  const conn = manager.active;
+  if (!conn?.connected) {
+    lastStatsInterestSent = null;
+    lastStatsInterestPeerId = null;
+    return;
+  }
+  const view =
+    typeof currentView === 'string'
+      ? currentView
+      : typeof window !== 'undefined' && typeof window.currentView === 'string'
+        ? window.currentView
+        : '';
+  const want = STATS_INTEREST_VIEWS.has(view);
+  if (
+    !force &&
+    lastStatsInterestSent === want &&
+    lastStatsInterestPeerId === conn.id
+  ) {
+    return;
+  }
+  lastStatsInterestSent = want;
+  lastStatsInterestPeerId = conn.id;
+  try {
+    conn
+      .request(Methods.setStatsInterest || 'setStatsInterest', {
+        active: want,
+        view: view || undefined,
+      })
+      .catch(() => {
+        // older servers may lack the method — ignore
+        lastStatsInterestSent = null;
+      });
+  } catch {
+    lastStatsInterestSent = null;
+  }
+}
+
+if (typeof window !== 'undefined') {
+  window.syncStatsInterest = syncStatsInterest;
+}
+
 // Utility functions are now imported from uiUtils.js
 
 
@@ -1384,6 +1468,13 @@ function navigateToView(viewName, opts = {}) {
   // Expose for auto-refresh poller
   if (typeof window !== 'undefined') window.currentView = viewName;
 
+  // Demand-driven fleet stats: only collect while on Containers / Dashboard / details
+  try {
+    syncStatsInterest();
+  } catch {
+    // ignore
+  }
+
   // Drop live streams / PTYs when leaving container details
   if (leavingDetails) {
     if (typeof stopDetailsLogs === 'function') stopDetailsLogs();