Misc/NEWS.d/next/Core and Builtins/2019-06-25-01-45-06.bpo-37392.J3JhIx.rst

Remove ``sys.getcheckinterval()`` and ``sys.setcheckinterval()`` functions.
They were deprecated since Python 3.2. Use :func:`sys.getswitchinterval` and
:func:`sys.setswitchinterval` instead. Remove also ``check_interval`` field of
the ``PyInterpreterState`` structure.