> For the complete documentation index, see [llms.txt](https://docs.fluentbit.io/manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fluentbit.io/manual/1.5/undefined.md).

# Fluent Bit v1.5 Documentation

![](/files/-M4M3YtjaYgPpNf5qUfF)

[Fluent Bit](http://fluentbit.io) is a Fast and Lightweight Log Processor, Stream Processor and Forwarder for Linux, OSX, Windows and BSD family operating systems. It has been made with a strong focus on performance to allow the collection of events from different sources without complexity.

## Features

* High Performance
* Data Parsing
  * Convert your unstructured messages using our parsers: [JSON](/manual/1.5/pipeline/parsers/json.md), [Regex](/manual/1.5/pipeline/parsers/regular-expression.md), [LTSV](/manual/1.5/pipeline/parsers/ltsv.md) and [Logfmt](/manual/1.5/pipeline/parsers/logfmt.md)
* Reliability and Data Integrity
  * [Backpressure](/manual/1.5/administration/backpressure.md) Handling
  * [Data Buffering](/manual/1.5/administration/buffering-and-storage.md) in memory and file system
* Networking
  * Security: built-in TLS/SSL support
  * Asynchronous I/O
* Pluggable Architecture and [Extensibility](/manual/1.5/development/library_api.md): Inputs, Filters and Outputs
  * More than 50 built-in plugins available
  * Extensibility
    * Write any input, filter or output plugin in C language
    * Bonus: write [Filters in Lua](/manual/1.5/pipeline/filters/lua.md) or [Output plugins in Golang](/manual/1.5/development/golang-output-plugins.md)
* [Monitoring](/manual/1.5/administration/monitoring.md): expose internal metrics over HTTP in JSON and [Prometheus](https://prometheus.io/) format
* [Stream Processing](https://github.com/fluent/fluent-bit-docs/tree/cfd3e4baa1d76a0778f5fd62bdf8de1e48360b72/stream-processing/README.md): Perform data selection and transformation using simple SQL queries
  * Create new streams of data using query results
  * Aggregation Windows
  * Data analysis and prediction: Timeseries forecasting
* Portable: runs on Linux, MacOS, Windows and BSD systems

## Fluent Bit, Fluentd and CNCF

[Fluent Bit](http://fluentbit.io) is a sub-component of the [Fluentd](http://fluentd.org) project ecosystem, it's licensed under the terms of the [Apache License v2.0](http://www.apache.org/licenses/LICENSE-2.0). This project was created by [Treasure Data](https://www.treasuredata.com) and is its current primary sponsor.

Nowadays Fluent Bit get contributions from several companies and individuals and same as [Fluentd](https://www.fluentd.org), it's hosted as a [CNCF](https://cncf.io) subproject.


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