PropCheck.Instrument.is_instrumentable_function

You're seeing just the callback is_instrumentable_function, go back to PropCheck.Instrument module for more information.
Link to this callback

is_instrumentable_function(mod, fun)

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Specs

is_instrumentable_function(
  mod :: erl_ast_atom_type(),
  fun :: erl_ast_atom_type()
) :: boolean()

A callback to decide if the function mod:fun with any arity is a candidate for instrumentation. The default implementation is simply calling instrumentable_function/2.