No. But META.* should.

There are some details to be found in the POD for ExtUtils::MakeMaker, but probably your best source of information is to find a few modules that use the same maker (Module::Build, ExtUtils::MakeMaker, Module::Install), and browse the distributions.

Their inclusion is not mandatory, but they're helpful. The META files help in CPAN indexing, and I think they're useful to cpanminus, and possibly others. But MYMETA.* are not intended to be distributed, only the META.* files.