You can already opt in to testing undployed code by using the WikimediaDebug[1] browser extension (available for firefox[2] and chrome[3])

Maybe we should add an option to force a request to be served from the latest branch instead of the one assigned in wikiversions.json.

[1] https://wikitech.wikimedia.org/wiki/WikimediaDebug
[2] https://addons.mozilla.org/en-US/firefox/addon/wikimedia-debug-header/
[3] https://chrome.google.com/webstore/detail/wikimediadebug/binmakecefompkjggiklgjenddjoifbb


On Tue, Jul 13, 2021 at 12:21 AM Jeremy Baron <jeremy@tuxmachine.com> wrote:
This makes me wonder if there could ever be a way to allow some requests to be on one group and other requests for the same wiki could be another group.

e.g. users could opt-in to being a canary or some users could be randomly selected.

When would this not work? If a newer version required schema change then have to stop using old version after applying new schema? but that isn't very common? any other complications?

-Jeremyb
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