Back in the day (10-12 years ago) at a telecom/cable we accomplished this with F5 Big IP GSLB DNS (and later migrated to A10's GSLB equivalent devices) as the auth DNS server for services/zones that required or were suitable for HA. (I can't totally remember but I'm guessing we must have had a pretty low TTL for this).
Had no idea that Route 53 had this sort of functionality
Speaking of F5 Big IP DNS devices, does anyone know of any auth DNS software solution for GSLB/health checking for DNS (I guess excluding Route 53 or other cloud/SaaS). Last I looked all I could find was the polaris-gslb addon for PowerDNS, but the GitHub for that has no activity in 8 years.
We've been using Polaris for the Loadbalancer.org GSLB for a few years now, and we've found it fast and stable. Its so simple its never needed any updates:
Although we did patch a dynamic health check a while back, which will be open source of course. But I'll get someone to check if we actually gave it back to the community or not...
Had no idea that Route 53 had this sort of functionality