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server.pendingRequests 和 server.pendingWebSockets

使用内置计数器监控服务器活动： 
const server = Bun.serve({
  fetch(req, server) {
    return new Response(
      `活跃请求数: ${server.pendingRequests}\n` + `活跃 WebSocket 数: ${server.pendingWebSockets}`,
    );
  },
});

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server.subscriberCount(topic)

获取某个 WebSocket 主题的订阅者数量： 
const server = Bun.serve({
  fetch(req, server) {
    const chatUsers = server.subscriberCount("chat");
    return new Response(`${chatUsers} 用户在聊天`);
  },
  websocket: {
    message(ws) {
      ws.subscribe("chat");
    },
  },
});