(in any context, maybe just for airplane travel or to visit a care home, "covid certificates" = covid passports, could be a negative PCR/LFT or proof of vaccine or exemption to travel or go to the pub or a gig maybe, etc)
What conditions need to be met (in your mind) for the presented covid-certs to be stopped & no longer required? What is the threshold you want to see that would make you think "It's Ok to drop that now." How would you know?