[Qgis-psc] Releasing LT version monthly in the first 6 months after the release

[Andreas Neumann]

Hi PSC and devs,

It seems like there is consensus that LT can/should be released more 
often. At least the testers Giovanni and Alex have nothing against 
releasing LT more often - and Jürgen has it automated. Nyall and myself 
(and probably others) are both for releasing more often - esp. in the 
light of the combination with the quarantine rule and one month delay 
that comes with the quarantine rule.

So Jürgen: May I please kindly ask you to adjust the road map ( 
https://www.qgis.org/en/site/getinvolved/development/roadmap.html#release-schedule 
) again - sorry about the back on forth in this respect.

This would mean:

3.28.5: 2023-03-31
3.28.6: 2023-04-28
3.28.7: 2023-05-26
3.28.8: 2023-06-23 --> switch to 4 month cycle
3.28.9: 2023-10-27 (last 3.28.x release)

This basically means that only the last quarter of the life span of an 
LT release would be released in the "thinned out" mode and the releases 
before still in the monthly cycle. In the last quarter of the life span 
of an LT version there are typically fewer backports, because hopefully 
the more severe issues are fixed before and it also gets more and more 
difficult to backport for devs.

Enterprise and gov users typically install after a version becomes LT (4 
months after the initial release) - then they test and report issues. 
This means that in the middle of the life span of an LT version there is 
still a lot of feedback and fixes coming in - hence we need the monthly 
releases in this time period.

Thank you for your consideration - Jürgen!

Andreas
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