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

It's part of the GraduatedFluentd Ecosystem and a CNCFCloud 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.

We follow a fast-paced development cycle, with major releases every 3–4 months.The active development branch (master) is currently focused onv5.0 (development).

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

To track upcoming milestones, visit theproject roadmap.

• ⚡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 inC, filters inLua, and outputs inGo
• 🔌Supports Logs, Metrics, and Traces with unified processing and delivery

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

📚https://docs.fluentbit.io

Build from source:

cd buildcmake ..makebin/fluent-bit -i cpu -o stdout -f 1

More details:Build & Install

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

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

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 ourdocumentation.

Fluent Bit is deployedover 10 million times daily and has surpassed15 billion downloads.

Used by companies like:

Want to add your logo?Open an issue.

Fluent Bit is open to community contributions!

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

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

Apache License v2.0

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