Ruby is tracked, and I can confirm that this has been the case for at least 10 years. In all AA PNRs, if the passenger has Ruby status, the first or second line of the PNR will say "* RUBY *" (likewise for SPHs and EMDs). For Amadeus carriers (all oneworld carriers except AA, LA and their affiliates, not sure about S7), the SSR (Special Service Request) line for frequent flyer membership will read something like, taking my own example, "*SSR FQTV BA HK/ CX1xxxxxxxxx RUBY/SL."