The [[ https://www.mediawiki.org/wiki/Extension:LoginNotify | LoginNotify ]] extension requires Echo to be useful, but [[ https://login.wikimedia.org/ | loginwiki ]] doesn't have Echo installed. What would the the best way to support loginwiki from LoginNotify?
Some possible ideas:
* Install Echo on loginwiki and rely on cross-wiki notifications. (This might be problematic since we don't want people to actually visit loginwiki.)
* Modify LoginNotify to send notifications to a user's home wiki (as defined by CentralAuth) rather than the local wiki.
* Modify LoginNotify to send notifications to a configured fall-back wiki (e.g. meta) if Echo isn't available on the local wiki.
See T153335#2899401 for more discussion.