Hello, The Release Engineering team will be expanding the set of people responsible for the weekly MediaWiki train deployments[0] to include people working normal European hours. Unfortunately, the current MW train deployment window is too late in the day for them. To address this we are adding a European-focused timeslot for the MW train (and moving the current "EU SWAT window" 2 hours earlier to accommodate). The first planned use of the new window will be next week, the week of July 9th. For the avoidance of doubt: the normal MW train windows will not go away, these EU-timezone ones are in addition to them and only used during weeks that the train is conducted by someone in Europe. But, the EU SWAT window will indeed be permanently moved for simplicity (IOW: not dependent upon who's doing the train). == European train window and changes == This would affect Tuesday, Wednesday, and Thursday * 1300-1400 CEST (1100-1200 UTC) - EU SWAT window (2 hours earlier) * 1400-1500 CEST (1200-1300 UTC) - Break * 1500-1700 CEST (1300-1500 UTC) - EU Train window * 1700-1800 CEST (1500-1600 UTC) - Break * 1800-1900 CEST (1600-1700 UTC) - PuppetSWAT (Tue/Thu only, no change) Also, at the same time we'll be moving the Wednesday morning (SF time) SWAT window on hour earlier to 9am Pacific. This is to alleviate a contention with the weekly Scrum of Scrums meeting. Best, Greg [0] https://www.mediawiki.org/wiki/MediaWiki_1.32/Roadmap -- | Greg Grossmeier GPG: B2FA 27B1 F7EB D327 6B8E | | Release Team Manager A18D 1138 8E47 FAC8 1C7D |

One question/clarification, though: deployment windows have traditionally been pinned to SF time (wrt DST changes, concretely), but in your email you list them in CEST/UTC. Does that imply that these slots are pinned to Europe's DST, UTC or will they stay pinned to pacific DST?

On 11 July 2018 at 00:47, Greg Grossmeier <greg(a)wikimedia.org> wrote: It seems to me that it will be confusing only to non-US people, honestly, which are the ones benefiting from this change. When DST changes are applied, and because they are not applied at the same across the globe, people will see their SWAT times change for no apparent reason. At the same time, there is plenty of hours of difference between the last deploy window mentioned in your email and the first SF-centric deployment window to account for the periods when DST settings vary. I believe that pinning them to UTC would actually eliminate the confusion. My 2 cents, Marko Marko Obrovac, PhD Senior Services Engineer Wikimedia Foundation Engineering mailing list Engineering(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/engineering

(un)relatedly: * EU survey to remove summertime/DST: <https://ec.europa.eu/eusurvey/runner/2018-summertime-arrangements?surve ylanguage=EN> * California Proposition 7 (2018) to institute a permanent DST: <https://ballotpedia.org/California_Proposition_7,_Permanent_Daylight_Sa ving_Time_Measure_(2018)> Hopefully we can get rid of this problem at the root cause as well :)