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edsiper merged 2 commits into from
Jan 6, 2026
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maintenance: update branch and security EOL info #11339

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3ec04dc
maintenance: update branches info
edsiper Jan 5, 2026
ff52532
security: set v4.0.x as EOL
edsiper Jan 5, 2026
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45 changes: 30 additions & 15 deletions MAINTENANCE.md
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Expand Up @@ -6,35 +6,50 @@ This document outlines the maintenance strategy and version support for Fluent B

| Branch | Version | Status | Maintainer | Notes |
|------------|--------------------|---------------------|-------------------------------------------------------------|--------------------------------------------------------------------|
| `master` | v4.1 (development) | Active development | [Eduardo Silva](https://github.com/edsiper) | All new features and bug fixes land here first |
| `4.0` | v4.0.x | Maintenance only | [Hiroshi Hatake (@cosmo0920)](https://github.com/cosmo0920) | Critical fixes and safe backports only. Maintained until **Dec 31, 2025** |
| `master` | v5.0 (development) | Active development | [Eduardo Silva](https://github.com/edsiper) | All new features and bug fixes land here first |
| `4.2` | v4.2.x | Stable | [Eduardo Silva](https://github.com/edsiper) [Hiroshi Hatake (@cosmo0920)](https://github.com/cosmo0920) | Current stable release series. Active development and updates. May receive minor enhancements in addition to fixes. |
| `4.1` | v4.1.x | Maintenance only | [Hiroshi Hatake (@cosmo0920)](https://github.com/cosmo0920) | Critical fixes and safe backports only. Maintained until **February 28, 2026** |

---

## v4.0 Maintenance Policy
## Maintenance Policy

As of **July 2025**, active development has moved to Fluent Bit **v4.1** (tracked in the `master` branch).
Active development is currently on Fluent Bit **v5.0** (tracked in the `master` branch). The **v4.2** branch is the current stable release series and receives active updates. Previous release lines enter **maintenance mode** after the next major/minor release.

**v4.0** has entered **maintenance mode**, now maintained by [Hiroshi Hatake (@cosmo0920)](https://github.com/cosmo0920), a long-time Fluent Bit contributor and core developer.
### Accepted Changes for Maintenance Branches

Maintenance for v4.0 will continue until **December 31, 2025**, which is three months after the official v4.1 release.

### Accepted Changes for v4.0

- ✅ Security patches
- ✅ Security patches (see [SECURITY.md](SECURITY.md) for security update timelines)
- ✅ Critical bug fixes
- ✅ Low-risk enhancements that unblock adoption (e.g., OpenTelemetry improvements, performance tuning)

> ⚠️ All changes must first be merged into `master` before being cherry-picked into the `4.0` branch by the maintainer.
> ⚠️ All changes must first be merged into `master` before being cherry-picked into maintenance branches by the maintainer.

Maintenance releases continue on an as-needed basis depending on urgency and impact.

### v4.2 Stable Series

**v4.2** is the current stable release series and receives active development, bug fixes, and security updates. This is the recommended version for production use.

v4.0 releases will continue on an as-needed basis depending on urgency and impact.
### v4.1 Maintenance

**v4.1** has entered **maintenance mode**, now maintained by [Hiroshi Hatake (@cosmo0920)](https://github.com/cosmo0920), a long-time Fluent Bit contributor and core developer.

**v4.1** will receive security updates and critical fixes until **February 28, 2026** (as specified in [SECURITY.md](SECURITY.md)).

### v4.0 Maintenance

**v4.0** reached **End-of-Life (EOL)** on **December 23, 2025** and is no longer maintained. No further security patches or bug fixes will be provided for this version line.

---

## How to Contribute to Maintained Versions

If you're submitting a fix or feature relevant to v4.0:
If you're submitting a fix or feature relevant to a stable or maintenance branch (v4.2 or v4.1):

- Open your PR against the `master` branch
- Add a note in the PR or issue: `Target: v4.0`
- Tag [@cosmo0920](https://github.com/cosmo0920) to request backport consideration
- Add a note in the PR or issue: `Target: v4.2` or `Target: v4.1`
- Tag the branch maintainer to request backport consideration:
- For v4.2: [@edsiper](https://github.com/edsiper) [@cosmo0920](https://github.com/cosmo0920)
- For v4.1: [@cosmo0920](https://github.com/cosmo0920)

> **Note:** v4.0 is End-of-Life and no longer accepts backports. For security-related issues, please follow the process outlined in [SECURITY.md](SECURITY.md).
4 changes: 2 additions & 2 deletions SECURITY.md
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Expand Up @@ -7,8 +7,8 @@ Fluent Bit maintains active security support for a limited set of release lines.
| Version | Status | Security Updates Until |
|-----------|------------|------------------------|
| **4.2.x** | ✅ Active | **July 30, 2026** |
| **4.1.x** | ✅ Active | **February 28, 2026** |
| **4.0.x** | ✅ Active | **December 23, 2025** |
| **4.1.x** | ✅ Active | **February 28, 2026** |
| **4.0.x** | ❌ EOL | **December 23, 2025** |
| **3.2.x** | ❌ EOL | — |
| **< 3.2** | ❌ EOL | — |

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