==== Background
As part of {T264343}, the Growth team is working on a sign up form for mentors. We decided to create a structured mentor list, `MediaWiki:GrowthMentors.json`, to serve as the new canonical location for the list of mentors, similar to what [community configuration](https://www.mediawiki.org/wiki/Growth/Community_configuration) does.
==== Task objective
Deploy the structured mentor list to Wikimedia wikis. This has to be done carefully, because it will be difficult to go back once we do the deployment.
==== Deployment checklist
===== Prerequisites
[ ] Write a migration script (T310446)
[ ] Wait until code is ready to adequately support the structured mentor list (currently tracked under T264343)
[ ] Review existing wikitext mentor lists for inconsistencies, bugs, etc. (T310906)
===== Migration
[ ] Switch beta cluster + testwiki to structured mentor list (substeps have to be done at once)
[ ] Set `$wgGEMentorProvider = "structured"` for all affected wikis
[ ] Run `mwscript extensions/GrowthExperiments/maintenance/migrateWikitextMentorList.php --wiki=XXwiki` for all affected wikis
[ ] Thoroughly QA behavior with the structured mentor list at those wikis; ask Ambassadors to review the interface
[ ] Announce the migration to the pilot wikis, inform them about the impact
[ ] Switch the pilot wikis to structured mentor list (substeps have to be done at once; **point of no return**)
[ ] Set `$wgGEMentorProvider = "structured"` for all affected wikis
[ ] Run `mwscript extensions/GrowthExperiments/maintenance/migrateWikitextMentorList.php --wiki=XXwiki` for all affected wikis
[ ] Wait 1 week for possible issues
[ ] Address all raised issues
[ ] Announce the migration to the rest of the wikis, inform them about the impact
[ ] Switch all remaining wikis to structured mentor list (substeps have to be done at once; **point of no return**)
[ ] Set `$wgGEMentorProvider = "structured"` for all affected wikis
[ ] Run `mwscript extensions/GrowthExperiments/maintenance/migrateWikitextMentorList.php --wiki=XXwiki` for all affected wikis
===== Clean up
[ ] Remove code supporting the wikitext-based mentor list