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About

Fluent Bit is a lightweight and high-performance Telemetry Agent designed to collect, process, and forward Logs, Metrics, and Traces from any source to any destination.

It's part of the Graduated Fluentd Ecosystem and a CNCF Cloud Native Computing Foundation project.

Fluent Bit supports a wide array of platforms, including Linux, Windows, MacOS, BSD, and Embedded environments, and is built for maximum efficiency with minimal CPU and memory footprint.

📌 Roadmap & Maintenance

We follow a fast-paced development cycle, with major releases every 3–4 months. The active development branch (master) is currently focused on v5.0 (development).

For version-specific maintenance timelines and policies, see our MAINTENANCE.md.

To track upcoming milestones, visit the project roadmap.

Key Features

• ⚡ High Performance with low memory footprint
• 📦 Pluggable Architecture: 70+ built-in plugins for Inputs, Filters, and Outputs
• 🧠 SQL Stream Processing: Perform analytics and transformations with SQL queries
• 🔒 Secure Networking: Built-in TLS/SSL support and async I/O
• 📊 Monitoring: Expose internal metrics over HTTP/Prometheus
• 🧩 Extensibility:
  • Write plugins in C, filters in Lua, and outputs in Go
• 🔌 Supports Logs, Metrics, and Traces with unified processing and delivery

Documentation

Our official documentation includes installation guides, plugin usage, developer resources, and more:

📚 https://docs.fluentbit.io

Quick Start

Build from source:

cd build
cmake ..
make
bin/fluent-bit -i cpu -o stdout -f 1

More details: Build & Install

Requirements

• CMake >= 3.0
• Flex & Bison
• YAML and OpenSSL headers

Install Fluent Bit

• Linux packages (Debian, Ubuntu, RHEL, etc.)
• Docker images
• Windows binaries

Plugins: Inputs, Filters, Outputs

Fluent Bit is fully modular. It supports:

• Input Plugins: collect logs/metrics/traces
• Filter Plugins: enrich and transform data
• Output Plugins: deliver data to external services

See the full plugin list in our documentation.

🚀 Production Usage

Fluent Bit is deployed over 10 million times daily and has surpassed 15 billion downloads.

Used by companies like:

Want to add your logo? Open an issue.

Contributing

Fluent Bit is open to community contributions!

• 🤝 Join our community
• 🛠 CONTRIBUTING.md
• 🚀 Developer Guide

Community & Contact

• 💬 Slack (#fluent-bit channel)
• 🐦 Twitter

License

Apache License v2.0

Authors

Fluent Bit is a CNCF graduated project, sponsored and maintained by major cloud providers and a growing community of contributors and maintainers from across the Cloud Native ecosystem.

👉 See Contributors