fix(gateway): keep tick broadcasts non-droppable (#65436)

* fix(gateway): keep tick broadcasts non-droppable

* Update CHANGELOG.md

CHANGELOG.md

@@ -10,6 +10,7 @@ Docs: https://docs.openclaw.ai
 
 - Gateway/auth: blank the shipped example gateway credential in `.env.example` and fail startup when a copied placeholder token or password is still configured, so operators cannot accidentally launch with a publicly known secret. (#64586) Thanks @navarrotech and @vincentkoc.
 - Memory/active-memory+dreaming: keep active-memory recall runs on the strongest resolved channel, consume managed dreaming heartbeat events exactly once, stop dreaming from re-ingesting its own narrative transcripts, and add explicit repair/dedupe recovery flows in CLI, doctor, and the Dreams UI.
+- Gateway/keepalive: stop marking WebSocket tick broadcasts as droppable so slow or backpressured clients do not self-disconnect with `tick timeout` while long-running work is still alive. (#65256) Thanks @100yenadmin and @vincentkoc.
 - Matrix/mentions: keep room mention gating strict while accepting visible `@displayName` Matrix URI labels, so `requireMention` works for non-OpenClaw Matrix clients again. (#64796) Thanks @hclsys.
 - Doctor: warn when on-disk agent directories still exist under `~/.openclaw/agents/<id>/agent` but the matching `agents.list[]` entries are missing from config. (#65113) Thanks @neeravmakwana.
 - Telegram: route approval button callback queries onto a separate sequentializer lane so plugin approval clicks can resolve immediately instead of deadlocking behind the blocked agent turn. (#64979) Thanks @nk3750.

src/gateway/server-maintenance.test.ts

@@ -104,6 +104,25 @@ describe("startGatewayMaintenanceTimers", () => {
     stopMaintenanceTimers(timers);
   });
 
+  it("broadcasts tick keepalives without dropIfSlow", async () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-04-12T00:00:00Z"));
+    const { startGatewayMaintenanceTimers } = await import("./server-maintenance.js");
+    const broadcast = vi.fn();
+
+    const timers = startGatewayMaintenanceTimers({
+      ...createMaintenanceTimerDeps(),
+      broadcast,
+    });
+
+    broadcast.mockClear();
+    await vi.advanceTimersByTimeAsync(30_000);
+
+    expect(broadcast).toHaveBeenCalledWith("tick", { ts: Date.now() });
+
+    stopMaintenanceTimers(timers);
+  });
+
   it("skips overlapping media cleanup runs", async () => {
     vi.useFakeTimers();
     let resolveCleanup = () => {};

src/gateway/server-maintenance.ts

@@ -61,7 +61,7 @@ export function startGatewayMaintenanceTimers(params: {
   // periodic keepalive
   const tickInterval = setInterval(() => {
     const payload = { ts: Date.now() };
-    params.broadcast("tick", payload, { dropIfSlow: true });
+    params.broadcast("tick", payload);
     params.nodeSendToAllSubscribed("tick", payload);
   }, TICK_INTERVAL_MS);