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ref-manual/release-process.rst: add a "Development Cycle" section

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Add a new section to release-process.rst to document the development
cycle of each release and namely the milestones and feature freeze
occuring after M3.

Fixes [YOCTO #15979]

(From yocto-docs rev: 1cc5321c162ce36079d661ea1d35c2694c20ed9b)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
(cherry picked from commit 77c04cc5944acda7575546a7434e014e4a75ba58)
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Antonin Godard
2026-01-05 17:00:59 +01:00
committed by Richard Purdie
parent 41ab4d1168
commit 0da3cd0ae6
1 changed files with 39 additions and 0 deletions
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documentation/ref-manual/release-process.rst
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@@ -45,6 +45,45 @@ release process validates the content of the new branch.
Realize that there can be patches merged onto the stable release
branches as and when they become available.
.. _ref-yp-development-cycle:
Development Cycle
=================
As explained in the previous :ref:`ref-manual/release-process:Major and Minor
Release Cadence` section, a new release comes out every six months.
During this six-months period of time, the Yocto Project releases four
"Milestone" releases which represent distinct points of time. The milestone
releases are tested through the :ref:`ref-manual/release-process:Testing and
Quality Assurance` process and helps spotting issues before the actual release
is out.
The time span between milestone releases can vary, but they are in general
evenly spaced out during this six-months period of time.
These milestone releases are tagged with a capital "M" after the future release
tag name. For example, the milestone tags "&DISTRO_RELEASE_SERIES;M1",
"&DISTRO_RELEASE_SERIES;M2", and "&DISTRO_RELEASE_SERIES;M3" are released before
the actual "&DISTRO_RELEASE_SERIES;" release.
.. note::
The fourth milestone (M4) is not actually released and announced, but
represents a point of time for the Quality Assurance team to start the
:ref:`ref-manual/release-process:Testing and Quality Assurance` process
before tagging and delivering the final release.
After the third milestone release (M3), the Yocto Project enters **Feature
Freeze**. This means that the maintainers of :term:`OpenEmbedded-Core
(OE-Core)`, :term:`BitBake` and other core repositories stop accepting
significant changes on the "master" branch. Changes that may be accepted are
minor upgrades to core components and security/bug fixes.
During feature freeze, a new branch is created and maintained separately to
test new features and enhancements received from contributors, but these changes
will only make it to the master branch after the release is out.
Major Release Codenames
=======================