Once the release is official. According to https://www.mediawiki.org/wiki/Version_lifecycle that should be in August of 2020. This will also require upgrading the payments servers to Debian Buster, as MW 1.35 requires PHP >= 7.2.22
|Open||None||T254298 Upgrade payments to MediaWiki 1.35|
|Open||None||T256146 Upgrade payments servers to Debian Buster|
|Stalled||None||T256153 Configure payments2xxx for MediaWiki 1.35 upgrade testing|
|Open||None||T257352 Create fundraising MediaWiki 1.35 payments deploy branch|
The codfw payments servers have been upgraded to Buster with stock php 7.3.14, and are in the standard payments deploy group so they're getting the same code/config as eqiad. We just need to run some tests and sign off on the upgrade, and we can upgrade eqiad too.
When we're ready to test MW 1.35, we can switch the deployment branch for payments2xxx and split the codfw servers from database replication and confirm that the upgrade works properly there before upgrading the eqiad servers.