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# PostHog exporter

[PostHog](https://posthog.com/) 是一个带有 AI 可观测性功能的分析平台，用于监控 LLM 应用。PostHog exporter 会将 Trace 作为结构化事件发送到 PostHog，帮助你深入了解 token 用量、成本、延迟和对话流程。

## 安装

**npm**:

```bash
npm install @mastra/posthog@latest
```

**pnpm**:

```bash
pnpm add @mastra/posthog@latest
```

**Yarn**:

```bash
yarn add @mastra/posthog@latest
```

**Bun**:

```bash
bun add @mastra/posthog@latest
```

## 配置

### 前提条件

1. **PostHog 账户**：在 [posthog.com](https://posthog.com/) 注册
2. **项目 API key**：从 PostHog Settings → Project API Key 获取
3. **环境变量**：设置凭据

```bash
# Required
POSTHOG_API_KEY=phc_xxxxxxxxxxxxxxxx

# Optional
POSTHOG_HOST=https://us.i.posthog.com  # or eu.i.posthog.com for EU region
```

### 零配置设置

设置环境变量后，无需任何配置即可使用 exporter：

```typescript
import { Mastra } from '@mastra/core'
import { Observability } from '@mastra/observability'
import { PosthogExporter } from '@mastra/posthog'

export const mastra = new Mastra({
  observability: new Observability({
    configs: {
      posthog: {
        serviceName: 'my-service',
        exporters: [new PosthogExporter()],
      },
    },
  }),
})
```

### 显式配置

你也可以直接传入凭据（优先于环境变量）：

```typescript
import { Mastra } from '@mastra/core'
import { Observability } from '@mastra/observability'
import { PosthogExporter } from '@mastra/posthog'

export const mastra = new Mastra({
  observability: new Observability({
    configs: {
      posthog: {
        serviceName: 'my-service',
        exporters: [
          new PosthogExporter({
            apiKey: process.env.POSTHOG_API_KEY,
          }),
        ],
      },
    },
  }),
})
```

## 配置选项

### 完整配置

```typescript
new PosthogExporter({
  // Required credentials
  apiKey: process.env.POSTHOG_API_KEY!,

  // Optional settings
  host: 'https://us.i.posthog.com', // Default: US region
  // or "https://eu.i.posthog.com" for EU region
  // or your self-hosted URL

  // Batching configuration
  flushAt: 20, // Batch size (default: 20)
  flushInterval: 10000, // Flush interval in ms (default: 10000)
  serverless: false, // Serverless mode: flushAt=10, flushInterval=2000

  // User identification
  defaultDistinctId: 'anonymous', // Fallback if no userId in metadata

  // Privacy settings
  enablePrivacyMode: false, // Excludes input/output from generation events

  // Diagnostic logging
  logLevel: 'info', // debug | info | warn | error
})
```

### Serverless 模式

针对 serverless 环境优化批处理：

```typescript
new PosthogExporter({
  apiKey: process.env.POSTHOG_API_KEY!,
  serverless: true, // Configures smaller batches for faster flushing
})
```

### 隐私模式

从生成事件中排除输入/输出数据，同时保留 token 指标：

```typescript
new PosthogExporter({
  apiKey: process.env.POSTHOG_API_KEY!,
  enablePrivacyMode: true, // Removes $ai_input and $ai_output_choices
})
```

### 群组分析

要将事件关联到 [PostHog 群组](https://posthog.com/docs/product-analytics/group-analytics)，请在 `tracingOptions.metadata` 中添加 `$groups` 对象。Exporter 会将这些值作为 PostHog capture 调用的顶层 `groups` 字段发送，以便你按群组细分 LLM 成本等分析结果。

```ts
await agent.generate(input, {
  tracingOptions: {
    metadata: {
      $groups: {
        publication: 'publication-1',
      },
    },
  },
})
```

## 相关内容

- [Tracing 概览](https://mastra.zisheng.pro/docs/observability/tracing/overview)
- [PostHog 文档](https://posthog.com/docs)