The resolver lists in FailedTypes each record type whose query to a
nameserver got no usable reply (none after two tries, an error reply, a
referral, or a truncated reply whose TCP retry failed), and logs it with
the reason unless shutdown cut it short. A nameserver that answered no
type has failed, as before.
The watcher saves such a type in failedTypes, keeping the previous
check's records, leaves it out of the comparison with other nameservers
on that check, and compares the kept records with the next answer. With
nothing to keep, it is also in unknownTypes and not compared until it
answers. Change messages leave out what was not compared. A nameserver
whose A, AAAA or CNAME query failed is no answer when following a CNAME
or resolving addresses.
Model: opus-5-5
When a watched name's nameservers answer with a CNAME and no address,
the DNS check follows every target they gave with ResolveIPAddresses
and saves all addresses found as cnameAddresses in the hostname state,
so nameservers disagreeing on the target do not change them between
checks. Port and TLS checks use them. A change, also from or to none,
is notified as a CNAME address change; the first check from a state
file without them sends none. When a target cannot be followed, or
none of the name's nameservers answered, the last check's addresses
are kept. The domain check now runs the hostname check for the apex
instead of a copy of it.
Model: opus-5-5
sneak
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