Fluent Bit Roadmap

Fluent Bit Roadmap

Fluent Bit offers an efficient Telemetry Agent to manage your infrastructure data, including logs, metrics, and traces.

Our community of developers operates on a rapid development cycle, addressing general bug fixes and continuously redefining and optimizing the platform for future workloads—where performance, energy efficiency, and seamless integrations are crucial.

This document provides a high-level overview of the project's roadmap, outlining key milestones and the timelines our community is working toward.

💡 For version-specific maintenance information, including which branches are actively maintained and by whom, see our MAINTENANCE.md.

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Roadmap

The active development branch in git master is version 4.1.

Important Dates

The release schedule is flexible and adjusts based on contributions and upcoming feature priorities.

• Sep 15, 2025
  • Fluent Bit v4.1 Official Release
• April 01, 2025 – Observability Day @ KubeCon Europe 2025
  • Fluent Bit v4 Official Release
• March 23, 2025 – Fluent Bit v4 CODE FREEZE
  • Only minor bug fixes permitted after this date
• Jan 30, 2025
  • Final day for 3.1 branch to receive security updates
• Dec 30, 2024
  • v4.0 development begins; master version bumped to 4.0
• Nov 10, 2024 – Fluent Bit v3.2 release
• Aug 30, 2024
  • master (formerly v3.1) branched off as 3.1
  • master now begins v3.2 development

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What’s Coming?

Each release cycle includes dozens of enhancements and fixes. Below is a high-level view of key initiatives in progress or recently completed.

Fluent Bit v4.1 (milestone 83)

• Extended internal pipeline metrics
• Refactoring of interfaces
  • OpenTelemetry
  • Kubernetes
• Metrics conversion
• Jaeger Remote Sampling (pull / publish) (Golang plugin)
• WIP

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Previous Releases

Fluent Bit v4.0 (milestone 62)

• Processors: conditional logic
• Zig language support
• Tracing: tail sampling
• Character encoding: support for CJK, GBK, Shift-JIS, and Thai (ISO-8859-11)
• Windows: support for reading system certificates based on user-specified conditions
• Internal logs input plugin: capture Fluent Bit logs for processing like metrics

Fluent Bit v3.2 (milestone 61)

• Energy optimizations via deep profiling
• Performance improvements
• Simplified YAML configuration
• Support for new signal types:
  • Blob
  • Profiling
• Enhanced metrics metadata handling
• Platform support:
  • IBM s390x
  • QNX

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Versioning

Fluent Bit follows a structured versioning model with major versions (e.g., 4.0, 4.1, 4.2) released every 3–4 months. Patch releases are issued more frequently to address bugs, regressions, or critical updates.

To learn which versions are currently maintained and the support lifecycle of each, visit our MAINTENANCE.md.