Decide and action if this means deprecate / delete or version

Discovery:

• https://wikitech.wikimedia.org/wiki/Metrics_Platform/Instrument_list
• SDS: See also the Epics column at https://phabricator.wikimedia.org/project/view/589/
• JS code search
• PHP code search

Plan

• Look into usage and announce new API
• Make sure (in collaboration) that there are no breaking changes