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Deployed Over Fifteen Billion Times
An End to End Observability Pipeline
Fluent Bit is a super fast, lightweight, and highly scalable logging, metrics, and traces processor and forwarder. It is the preferred choice for cloud and containerized environments.
v4.2.2 released on December 23, 2025
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1[INPUT]
2 Name tail
3 Tag tail.01
4 Path /var/log/system.log
5[OUTPUT]
6 Name s3
7 Match *
8 bucket your-bucket
9 region us-east-1
10 store_dir /home/ec2-user/buffer
11 total_file_size 50M
12 upload_timeout 10m
13[OUTPUT]
14 Name splunk
Fluent Bit enables you to collect logs and metrics from multiple sources, enrich them with filters, and distribute them to any defined destination.
- Optimized data parsing and routing
- Prometheus and OpenTelemetry compatible
- Stream processing functionality
- Built in buffering and error-handling capabilities
Trusted by some of the world’s largest and most complex organizations
Designed with performance in mind
A robust, lightweight, and portable architecture for high throughput with low CPU and memory usage from any data source to any destination.
Proven across distributed cloud and container environments. Highly available with I/O handlers to store data for disaster recovery.
> 1pb data throughput across thousands of sources and destinations daily
Granular management of data parsing and routing. Filtering and enrichment to optimize security and minimize cost.
> 1 Billion sources managed by Fluent Bit - from IoT Devices to Windows and Linux servers.
Lightweight, asynchronous design optimizes resource usage: CPU, memory, disk I/O, network. No more OOM errors!
~ 450kb minimal footprint maximizes asset support. Zero external dependencies.
Integration with all your technology - cloud native services, containers, streaming processors, and data backends.
80+ Plugins for inputs, filters, analytics tools and outputs.
Fluent Bit is a CNCF (Cloud Native Computing Foundation) graduated project under the umbrella of Fluentd.
We are part of a large open source community. No vendor lock-in.
The Fluent Bit Advantage
Fluent Bit is purpose built for high scale data observability in any dynamic, distributed environment
Fully event driven design, leverages the operating system API for performance and reliability. All operations to collect and deliver data are asynchronous
Optimized data parsing and routing to improve security and reduce overall cost. Distribute data to multiple destinations with a zero copy strategy
Simple, granular controls enable detailed orchestration and management of data collection and transfer across your entire ecosystem
An abstracted I/O layer supports high-scale read/write operations and enables optimized data routing and support for stream processing
Removes challenges with handling TCP connections to upstream data sources. Simplifies connection process, manages timeout/network exceptions and Keepalived states
When delivering data to destinations, output connectors inherit full TLS capabilities in an abstracted way. Add your certificates as required.
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