id	summary	reporter	owner	description	type	status	priority	component	resolution	keywords	cc
23	crawler: prioritize authoritative servers for zones	wander		"Some auth servers for a zone throw timeouts or have other issues, e.g. hn. had a lame delegation in NS set (only from child, not root) for nicmx-anycast.rds.org.hn. (200.33.111.1) which was returning REFUSED.

We should skip servers which respond unhealthy.

Also: prefer low latency servers over others?"	enhancement	closed	important	crawler	fixed