Its long overdue but Apple has finally introduced a one-stop reference web page. Detailing every repair/exchange program for almost all models currently, in production. For most part, Apple has been issuing silent recalls for years, repairing and exchanging only affected units. There’s now a way to keep track of those programs and realise whether your Mac is one of those affected systems.
If you’re curious whether your Mac’s part of any of Apple repair/exchange programs, check out Apple’s Battery Exchange and Repair Extension Program page.