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The Wikimedia Foundation began using a one-week deploy cycle in June of 2013 and modified in June 2015 to a more simple one. This page describes that cycle. The cycle consists of 3 deploys a week, to three groups of wikis, in 3 phases, starting on Tuesday. This means a version of MediaWiki that starts to go out to the WMF cluster on Tuesday the 7th will be on all WMF-hosted wikis by Thursday the 9th in the same week.

Generalized deploy calendar

See also MediaWiki 1.36/Roadmap on
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
group 0 group 1 group 2

Group 0

These are canary wikis, see dblists/group0.dblist. This group includes:

Group 1

These are non-Wikipedias, see dblists/group1.dblist.
These are most wikis, except canary wikis and Wikipedia. There are also individual Wikipedia sites that have chosen to be in Group 1 for early feedback (dblists/group1-wikipedia.dblist). This group includes:

Group 2

All other Wikipedias, see dblists/group2.dblist.

This includes (English Wikipedia).