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fluent/fluent-bit

Fast and Lightweight Logs, Metrics and Traces processor for Linux, BSD, OSX and Windows

Hosted by Cloud Native Computing Foundation · part of Linux Foundation

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fluent/fluent-bit has 8k+ stars and 2k+ forks on GitHub, is written in C, and was last pushed on Oct 17, 2026. Data as of . Signed-in members get hourly updates — create a free account.

Summary Information

Updated 37 minutes ago
Type:Server / PlatformCategory(s):Logging & TracingObservability & MonitoringData Pipelines & ETL/ELTDevOps & Observability
Added to GitGenius on October 2nd, 2022
Created on January 27th, 2015
Open Issues & Pull Requests: 806 (+0)
GitHub issues: Enabled
Number of forks: 2,016
Total Stargazers: 8,160 (+0)
Total Subscribers: 104 (+0)

Repository Insights (GitGenius)

Median issue/PR response: 4.2 days
Mean response time: 213.6 days
90th percentile: 881.0 days
Tracked items: 1,425

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Maintainer activity

6 people did triage or write work on this repository in the last 12 months.

Counts unlabeled, assigned, unassigned, milestoned, demilestoned, locked, unlocked over the last 12 months. These are issue and pull request events that require triage or write permission. Commits and code review are not counted. labeled and renamed are excluded because GitHub issue forms record the issue author as the actor. Figures from October 18, 2026. This count is not comparable across projects: each project's automation decides which of these events a person emits. How this is counted.

How this project is maintained

Roughly one issue in four opened in the past year never receives a reply. 98% of open issues come from outside the core team, so the backlog reflects real-world use rather than internal planning. Work labelled "bug" is answered fastest, typically in about 15 hours, while "enhancement" waits about 25 months. 50% of tracked open issues have had no activity in three months. 71% of issues opened in the past year have been closed, leaving a working backlog.

Charts & Analytics

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Issue Activity (beta)

Open issues: 234
New in 7 days: 12
Closed in 7 days: 2
Avg open age: 670 days
Stale 30+ days: 194
Stale 90+ days: 160

Recent activity

Opened in 7 days: 11
Closed in 7 days: 2
Comments in 7 days: 8
Events in 7 days: 21

Top labels

  • Stale (1,387)
  • status: waiting-for-triage (1,042)
  • fixed (206)
  • enhancement (193)
  • bug (166)
  • waiting-for-user (154)
  • question (111)
  • exempt-stale (53)

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Detailed Description

Fluent Bit is a lightweight, high-performance telemetry agent written in C that collects, processes, and forwards logs, metrics, and traces from any source to any destination. It is part of the Fluentd ecosystem and operates as a CNCF graduated project. The agent is designed for minimal resource consumption while maintaining high throughput, making it suitable for deployment across diverse environments including Linux, BSD, macOS, Windows, and embedded systems.

The repository demonstrates substantial production adoption, with the README documenting over 10 million daily deployments and surpassing 15 billion total downloads.

The architecture centers on a pluggable design supporting over 70 built-in plugins across input, filter, and output categories. Key technical features include SQL stream processing capabilities for analytics and transformations, built-in TLS/SSL support with async I/O for secure networking, and HTTP/Prometheus endpoints for exposing internal metrics. The extensibility model allows plugin development in C, filter creation in Lua, and output plugin development in Go. The unified processing pipeline handles logs, metrics, and traces through a single architecture.

Development follows a fast-paced cycle with major releases every three to four months, with the active master branch currently focused on version 5.0 development. The project maintains version-specific maintenance timelines documented in MAINTENANCE.md and tracks upcoming work through a public roadmap. Installation options span Linux packages for Debian, Ubuntu, and RHEL distributions, Docker images, and Windows binaries, with source builds supported through CMake, Flex, Bison, and standard development headers.

The project integrates with major cloud and data infrastructure services including AWS CloudWatch, Elasticsearch, Kafka, and S3. Cross-repository contributor analysis links Fluent Bit to microsoft/vscode, microsoft/typescript, and rust-lang/rust, indicating shared maintainer involvement across these ecosystems. The project operates under the Apache License v2.0 and maintains community engagement through Slack channels and social media presence.