# filter配置

丰富的过滤器插件的存在是 logstash 威力如此强大的重要因素。名为过滤器，其实提供的不单单是过滤的功能。在本章我们就会重点介绍几个插件，它们扩展了进入过滤器的原始数据，进行复杂的逻辑处理，甚至可以无中生有的添加新的 logstash 事件到后续的流程中去！


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# 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://hezhiqiang.gitbook.io/elkstack/logstash/cha-jian-pei-zhi/filter.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.