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maintenance: update v5.1 stable status #12290

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maintenance: update v5.1 stable status
edsiper Aug 14, 2026
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maintenance: clarify v5.0 accepted fixes
edsiper Aug 14, 2026
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53 changes: 31 additions & 22 deletions MAINTENANCE.md
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Expand Up @@ -4,18 +4,19 @@ This document outlines the maintenance strategy and version support for Fluent B

## Active Branches and Maintainers

| Branch | Version | Status | Maintainer | Notes |
|------------|--------------------|---------------------|-------------------------------------------------------------|--------------------------------------------------------------------|
| `master` | v5.1 (development) | Active development | [Eduardo Silva](https://github.com/edsiper) | Next minor development line. All new features and bug fixes land here first |
| `5.0` | v5.0.x | Stable | [Eduardo Silva](https://github.com/edsiper) [Hiroshi Hatake (@cosmo0920)](https://github.com/cosmo0920) | Current stable release series. Receives bug fixes, security fixes, and selected low-risk backports. |
| `4.2` | v4.2.x | Maintenance only | [Eduardo Silva](https://github.com/edsiper) [Hiroshi Hatake (@cosmo0920)](https://github.com/cosmo0920) | Critical fixes and safe backports only. Maintained until **July 30, 2026** |
| `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** |
| Branch | Version | Status | Maintainer | Notes |
|------------|---------|------------------|-------------------------------------------------------------|--------------------------------------------------------------------|
| `master` | v5.1.x | Stable | [Eduardo Silva](https://github.com/edsiper) | Current stable release series. All new features and bug fixes land here first. |
| `5.0` | v5.0.x | Maintenance only | [Eduardo Silva](https://github.com/edsiper) [Hiroshi Hatake (@cosmo0920)](https://github.com/cosmo0920) | Critical bug fixes, security fixes, and selected low-risk backports until **November 30, 2026**. |

---

## Maintenance Policy

Active development is currently on the next Fluent Bit **v5.1** line (tracked in the `master` branch). The **v5.0** branch is the current stable release series and receives stable branch updates. Previous release lines enter **maintenance mode** after the next major/minor release.
Fluent Bit **v5.1** is the current stable release series and is tracked in the
`master` branch. The **v5.0** branch is in maintenance mode and receives bug
fixes, security updates, and selected low-risk backports until its
End-of-Maintenance date. Older release lines are End-of-Life (EOL).

### Accepted Changes for Maintenance Branches

Expand All @@ -27,35 +28,43 @@ Active development is currently on the next Fluent Bit **v5.1** line (tracked in

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

### v5.0 Stable Series
### v5.1 Stable Series

**v5.0** is the current stable release series and receives bug fixes, security updates, and selected low-risk backports. This is the recommended version for production use.
**v5.1** is the current stable release series and is recommended for production
use. New features and bug fixes land in `master` first.

### v4.2 Maintenance
### v5.0 Maintenance

**v4.2** has entered **maintenance mode** and receives critical fixes and safe backports until **July 30, 2026** (as specified in [SECURITY.md](SECURITY.md)).
**v5.0** is in **maintenance mode** and receives critical bug fixes, security
updates, and selected low-risk backports until **November 30, 2026** (as
specified in [SECURITY.md](SECURITY.md)).

### v4.1 Maintenance
### v4.2 End-of-Life

**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.
**v4.2** reached **End-of-Life (EOL)** on **July 30, 2026** and is no longer
maintained.

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

### v4.0 Maintenance
**v4.1** reached **End-of-Life (EOL)** on **February 28, 2026** and is no longer
maintained.

### v4.0 End-of-Life

**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 a stable or maintenance branch (v5.0, v4.2, or v4.1):
If you're submitting a fix or feature relevant to a stable or maintenance
branch:

- Open your PR against the `master` branch
- Add a note in the PR or issue: `Target: v5.0`, `Target: v4.2`, or `Target: v4.1`
- Tag the branch maintainer to request backport consideration:
- For v5.0: [@edsiper](https://github.com/edsiper) [@cosmo0920](https://github.com/cosmo0920)
- For v4.2: [@edsiper](https://github.com/edsiper) [@cosmo0920](https://github.com/cosmo0920)
- For v4.1: [@cosmo0920](https://github.com/cosmo0920)
- For a v5.0 backport, add `Target: v5.0` to the PR or issue and tag
[@edsiper](https://github.com/edsiper) or
[@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).
> **Note:** v4.2 and earlier are End-of-Life and no longer accept backports. For
> security-related issues, follow the process outlined in
> [SECURITY.md](SECURITY.md).
2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -26,7 +26,7 @@ Fluent Bit supports a wide array of platforms, including Linux, Windows, MacOS,
## 📌 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).
The `master` branch currently tracks **v5.1**, the current stable release series.

For version-specific maintenance timelines and policies, see our [MAINTENANCE.md](https://github.com/fluent/fluent-bit/blob/master/MAINTENANCE.md).

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10 changes: 6 additions & 4 deletions SECURITY.md
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Expand Up @@ -6,14 +6,16 @@ Fluent Bit maintains active security support for a limited set of release lines.

| Version | Status | Security Updates Until |
|-----------|------------|------------------------|
| **5.1.x** | ✅ Active | To be announced |
| **5.0.x** | ✅ Active | **November 30, 2026** |
| **4.2.x** | ✅ Active | **July 30, 2026** |
| **4.2.x** | ❌ EOL | **July 30, 2026** |
| **4.1.x** | ❌ EOL | **February 28, 2026** |
| **4.0.x** | ❌ EOL | **December 23, 2025** |
| **3.2.x** | ❌ EOL | — |
| **< 3.2** | ❌ EOL | — |

> **Note:** 4.1 and earlier are End-of-Life (EOL) and receive no further fixes.
> **Note:** 4.2 and earlier are End-of-Life (EOL) and receive no further fixes.
> The v5.1 End-of-Maintenance date will be published when it is finalized.

---

Expand All @@ -22,7 +24,7 @@ Fluent Bit maintains active security support for a limited set of release lines.
- We backport **critical** and **high-severity** security fixes to all **Active** branches listed above.
- Medium/low-severity fixes may be backported at the maintainers’ discretion.
- After a branch reaches **EOM**, no further patches are published for that line.
- Users are strongly encouraged to keep current with the latest **4.x** release line.
- Users are strongly encouraged to use the latest **5.1.x** release.

---

Expand Down Expand Up @@ -59,4 +61,4 @@ For third-party CVEs that may impact Fluent Bit, we will post an assessment and

---

_Last updated: December 18, 2025_
_Last updated: August 14, 2026_
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