# Filter Plugins

The *filter plugins* allows to **alter** the incoming data generated by the *input plugins*. As of this version the following filter plugins are available:

| name                                                                            | title           | description                                     |
| ------------------------------------------------------------------------------- | --------------- | ----------------------------------------------- |
| [grep](https://docs.fluentbit.io/manual/1.0/filter/grep)                        | Grep            | Match or exclude specific records by patterns.  |
| [kubernetes](https://docs.fluentbit.io/manual/1.0/filter/kubernetes)            | Kubernetes      | Enrich logs with Kubernetes Metadata.           |
| [lua](https://docs.fluentbit.io/manual/1.0/filter/lua)                          | Lua             | Filter records using Lua Scripts.               |
| [parser](https://docs.fluentbit.io/manual/1.0/filter/parser)                    | Parser          | Parse record.                                   |
| [record\_modifier](https://docs.fluentbit.io/manual/1.0/filter/record_modifier) | Record Modifier | Modify record.                                  |
| [stdout](https://docs.fluentbit.io/manual/1.0/filter/stdout)                    | Stdout          | Print records to the standard output interface. |
| [throttle](https://docs.fluentbit.io/manual/1.0/filter/throttle)                | Throttle        | Apply rate limit to event flow.                 |
| [nest](https://docs.fluentbit.io/manual/1.0/filter/nest)                        | Nest            | Nest records under a specified key              |
| [modify](https://docs.fluentbit.io/manual/1.0/filter/modify)                    | Modify          | Modifications to record.                        |

In order to let a Filter be applied over some data, the **Match** rule must exists and it must match the Tag for the incoming data.


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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://docs.fluentbit.io/manual/1.0/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.