Changed Stable Release Updates policy for microreleases and new features

[Martin Pitt]

Hello Ubuntu developers,

over the years our SRU policy [1] has accumulated a fair amount of
special cases and exceptions for new microreleases [2]. There was a
lot of commonality between them, and maintaining that list was not
practical any more. Since most of these were added, a lot of projects
have moved to a CI based development model; this includes Ubuntu
itself, which is now running package integration tests for both the
development series and SRUs.

The Technical Board has now updated the policy for generalizing the
applicability of new upstream microreleases for SRUs [3]. This
obsoletes the MicroReleaseExceptions sub-page.

The policy was also extended to permit backporting new features to LTS
releases under certain safe conditions [4]. Please note that this
should still be done with common sense and care, and relatively
rarely.

Martin Pitt
p. p. Ubuntu Technical Board

[1] https://wiki.ubuntu.com/StableReleaseUpdates
[2] https://wiki.ubuntu.com/StableReleaseUpdates/MicroReleaseExceptions?action=recall&rev=59
[3] https://wiki.ubuntu.com/StableReleaseUpdates?action=diff&rev1=231&rev2=232
[4] https://wiki.ubuntu.com/StableReleaseUpdates?action=diff&rev1=232&rev2=233

-- 
Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)
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