# 第2章 探索PromQL

本章将带领读者探秘Prometheus的自定义查询语言PromQL。通过PromQL用户可以非常方便地对监控样本数据进行统计分析，PromQL支持常见的运算操作符，同时PromQL中还提供了大量的内置函数可以实现对数据的高级处理。当然在学习PromQL之前，用户还需要了解Prometheus的样本数据模型。PromQL作为Prometheus的核心能力除了实现数据的对外查询和展现，同时告警监控也是依赖PromQL实现的。

本章的主要内容：

* Prometheus的数据模型
* Prometheus中监控指标的类型
* 深入PromQL
* 4个黄金指标和USE方法


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://yunlzheng.gitbook.io/prometheus-book/parti-prometheus-ji-chu/promql.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.