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Fluent Bit - Official Documentation

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---
description: High Performance Telemetry Agent for Logs, Metrics and Traces
---

# Fluent Bit documentation

[Fluent Bit](https://fluentbit.io) is a fast and lightweight telemetry agent for logs, metrics, and traces for Linux, macOS, Windows, and BSD family operating systems. Fluent Bit has been made with a strong focus on performance to allow the collection and processing of telemetry data from different sources without complexity.![](https://static.scarf.sh/a.png?x-pxid=71f0e011-761f-4c6f-9a89-38817887faae)

## Features

- High performance: High throughput with low resources consumption
- Data parsing
  - Convert your unstructured messages using Fluent Bit parsers: [JSON](pipeline/parsers/json.md), [Regex](pipeline/parsers/regular-expression.md), [LTSV](pipeline/parsers/ltsv.md) and [Logfmt](pipeline/parsers/logfmt.md)
- Metrics support: Prometheus and OpenTelemetry compatible
- Reliability and data integrity
  - [Backpressure](administration/backpressure.md) handling
  - [Data buffering](./pipeline/buffering.md) in memory and file system
- Networking
  - Security: Built-in TLS/SSL support
  - Asynchronous I/O
- Pluggable architecture and [extensibility](development/library_api.md): Inputs, Filters and Outputs:
  - Connect nearly any source to nearly any destination using preexisting plugins
  - Extensibility:
    - Write input, filter, or output plugins in the C language
    - Wasm: [Wasm Filter Plugins](development/wasm-filter-plugins.md) or [Wasm Input Plugins](development/wasm-input-plugins.md)
    - Write [Filters in Lua](pipeline/filters/lua.md) or [Output plugins in Golang](development/golang-output-plugins.md)
- [Monitoring](administration/monitoring.md): Expose internal metrics over HTTP in JSON and [Prometheus](https://prometheus.io/) format
- [Stream Processing](stream-processing/overview.md): Perform data selection and transformation using basic SQL queries
  - Create new streams of data using query results
  - Aggregation windows
  - Data analysis and prediction: Time series forecasting
- Portable: Runs on Linux, macOS, Windows and BSD systems

### Release notes

For more details about changes in each release, refer to the [official release notes](https://fluentbit.io/announcements/).

If you are upgrading from the Fluent Bit `4.2` series, start with [What's new in Fluent Bit v5](installation/whats-new-in-fluent-bit-v5.md) and [Upgrade notes](installation/upgrade-notes.md).

## Fluent Bit, Fluentd, and CNCF

Fluent Bit is a [CNCF](https://www.cncf.io/) graduated sub-project under the umbrella of [Fluentd](https://www.fluentd.org).

Fluent Bit was originally created by [Eduardo Silva](https://www.linkedin.com/in/edsiper) and is now sponsored by [Chronosphere](https://chronosphere.io/). As a CNCF-hosted project, it's a fully vendor-neutral and community-driven project.

## License

Fluent Bit, including its core, plugins, and tools, is distributed under the terms of the [Apache License v2.0](https://github.com/fluent/fluent-bit?tab=Apache-2.0-1-ov-file#readme).

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