Problem/Motivation
Most of core has now been converted to OOP hook implementations. Let's deprecate the ones that can be converted.
Steps to reproduce
N/A
Proposed resolution
Deprecate within the call to the function.
Remaining tasks
Agree on messaging and exceptions
User interface changes
N/A
Introduced terminology
N/A
API changes
N/A
Data model changes
N/A
Release notes snippet
N/A
