Epics REST API is to be deprecated in favour of Work Items API
Summary
With the migration of Epics to Work Items &9290, the new features which will be available as a part of this migration won't be available in Epics REST API and aren't feasible to be implemented retroactively either so we've decided to deprecate this API starting %17.0 in favour of Work Items API. Additionally, Work Items API is available already in GraphQL so it remains unaffected from v4 to v5 Public API transition.
We're using this issue as a place to gather feedback about this change.