| CI Workflow | Status |
|---|---|
Unit Tests (master) |
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| Integration Tests |  |
| Arm builds | |
| Latest Release Pipeline |  |
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.
We follow a fast-paced development cycle, with major releases every 3–4 months.
The master branch tracks development of v5.2.0. The current stable release
series, v5.1, is tracked in the 5.1 branch.
For version-specific maintenance timelines and policies, see our MAINTENANCE.md.
To track upcoming milestones, visit the project 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 in C, filters in Lua, and outputs in Go
- 🔌 Supports Logs, Metrics, and Traces with unified processing and delivery
Our official documentation includes installation guides, plugin usage, developer resources, and more:
Build from source:
cd build
cmake ..
make
bin/fluent-bit -i cpu -o stdout -f 1More details: Build & Install
- CMake >= 3.0
- Flex & Bison
- YAML and OpenSSL headers
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.
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.
Fluent Bit is open to community contributions!
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.