On: 5 out of 7 .io nameservers appear to be down

[buster]

And yet the internet keeps working.. :) Docker.io still resolves for me, and i guess many others do?

[sajal83 → buster]

every y out of x times a DNS recursor will fail to resolve .io .... ratio of y:x is based on complex srtt algorithms, and traffic levels. Not a big issue for popular hostnames like docker.io because most recursives would have the delegation in their cache.

[nly → buster]

Caching is great isn't it.