2to3 -f future . -w
This will remove imports from __future__ that are no longer needed. https://docs.python.org/3.5/library/2to3.html#2to3fixer-future
We may want to add additional heartbeat checks, particularly depending on the context (e.g. different environments). This is meant to be a start at enabling a more plug-in style heartbeat check that provides more detailed diagnostics if desired.