TLDR: We will soon remove some parameters that were used to obtain CSRF tokens in the MediaWiki API.
This will break bots, gadgets and user scripts that are still using these parameters.
A significant and long delayed change to Action API is coming. API clients (user scripts, tools, etc) need to obtain
a token before making write requests to MediaWiki over Action API. Up to MediaWiki 1.24 the action=tokens
and ‘token’ parameter in the following API endpoints were used to obtain a token:
‘rctoken’ in action=query&list=recentchanges 
‘rvtoken’ in action=query&prop=revisions 
‘intoken’ in action=query&prop=info 
‘ustoken’ in action=query&list=users
Since MediaWiki 1.24 these module and parameters were deprecated and were emitting deprecation warnings to
API clients. These parameters and endpoint will now be removed from MediaWiki 1.37 and from Wikimedia installation.
To obtain CSRF tokens clients now need to use a consolidated ‘action=query&meta=tokens’ endpoint. 
Please respond to this email if you have any concerns or questions about this change.
Staff Software Engineer
Platform Engineering Team at WMF