> (You will notice that people like Google and Cloudflare skillfully respond with only one record with a 5 minute TTL. That is so the behavior of the browser is well defined, but it also eats their entire year of 99.999% uptime with one bad reply. Your systems had better be very reliable if DNS issues can eat a year's worth of error budget.)
This chapter in the Google SRE book explains how our load balancing DNS works:
This chapter in the Google SRE book explains how our load balancing DNS works:
https://landing.google.com/sre/sre-book/chapters/load-balanc...
Source: my team runs this service