> ## Documentation Index
> Fetch the complete documentation index at: https://bun.zhcndoc.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 指标

> 使用内置指标监控服务器活动

### `server.pendingRequests` 和 `server.pendingWebSockets`

使用内置计数器监控服务器活动：

```ts theme={"theme":{"light":"github-light","dark":"dracula"}}
const server = Bun.serve({
  fetch(req, server) {
    return new Response(
      `活跃请求数: ${server.pendingRequests}\n` + `活跃 WebSocket 数: ${server.pendingWebSockets}`,
    );
  },
});
```

### `server.subscriberCount(topic)`

获取某个 WebSocket 主题的订阅者数量：

```ts theme={"theme":{"light":"github-light","dark":"dracula"}}
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");
    },
  },
});
```