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Fluent Bit
Apache-2.0Super fast, lightweight log processor and forwarder.
Open-source alternative to — compare it against:
Overview
CI Status
| CI Workflow | Status |
|---|---|
Unit Tests (master) |  |
| Integration Tests |  |
| Arm builds |  |
| Latest Release Pipeline |  |
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 v5.1 (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:
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
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!
Community & Contact
License
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.
