Task for the sunsetting of Wikipedia Zero.
See also:
https://blog.wikimedia.org/2018/02/16/partnerships-new-approach/
https://medium.com/@refsrc/wikipedia-zero-which-provided-over-800-million-users-in-72-countries-with-access-to-wikipedia-at-ff3014a122e6
This includes:
[x] Remove special Apache/appserver code for Zero
[x] Apache config ([[ https://gerrit.wikimedia.org/r/482492 | patch ]])
[x] `mobilelanding.php` ([[ https://gerrit.wikimedia.org/r/482493 | patch ]])
[x] Remove special Varnish VCL code for Zero support – {T213769}
[x] Phabricator hacks ([[ https://gerrit.wikimedia.org/r/479399 | patch ]])
[x] Carrier tagging
[x] Disable ZeroBanner on all wikis ([[ https://gerrit.wikimedia.org/r/483193 | patch ]])
[ ] Delete zerowiki
[x] Remove from site config `all.dblist`, add to `deleted.dblist`, Remove references from InitialiseSettings.php https://gerrit.wikimedia.org/r/#/c/operations/mediawiki-config/+/521893
[x] Remove references from CentralAuth db as it's an SUL wiki
[x] Remove references from GlobalUsage db
[x] Purge any jobs
[x] Remove general configuration
[x] Drop the Wikipedia Zero debug log channel ([[ https://gerrit.wikimedia.org/r/482099 | patch ]])
[x] robots.php: Drop the special treatment for Wikipedia Zero ([[ https://gerrit.wikimedia.org/r/482100 | patch ]])
[x] Un-deploy MediaWiki extensions:
[x] Drop the ability to use ZeroBanner and ZeroPortal from production ([[ https://gerrit.wikimedia.org/r/482102 | patch ]])
[x] Stop configuring ZeroBanner and ZeroPortal, unused ([[ https://gerrit.wikimedia.org/r/482103 | patch ]])
[x] Stop loading i18n for ZeroBanner and ZeroPortal, unused ([[ https://gerrit.wikimedia.org/r/482104 | patch ]])
[x] {T197528}
[x] {T213770}
[x] Remove traces of Zero from MobileFrontend
[ ] Update interwiki cache (blocked on HTTP Auth)
[ ] Drop from DNS https://gerrit.wikimedia.org/r/521886
[ ] {T227716}
[ ] {T227717}
[ ] {T227718}
[ ] {T227731}