> I find the url without the trailing dot way less surprising.

Agreed, the vast majority of people don't know ẗhat "absolute" DNS names
are a thing. Even designers of some "enterprise-class" firewalls
apparently :-)

On the other hand, how many people look at this configuration file?

> I did some tests with host(1), and I didn't see the local search
domain appended to the hostname I queried. Perhaps it happens if the
query fails or times out? But the default for ndots is 1, and systemd-
resolved (current version in resolute) even says that it is ignored, and
queried hostnames with a dot anywhere are always treated as an FQDN and
do not get the search domain appended.

While testing this again a couple months ago, I discovered that various
DNS clients/librairies have indeed different settings and behaviors and
can treat the same search domains input differently. For sure the
trailing dot silenced a lot of bogus queries and noise when it was
added, this was confirmed by multiple users. Maybe it does not make a
difference now. Things change.

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https://bugs.launchpad.net/bugs/2148643

Title:
  [SRU] connectivity-check.ubuntu.com URL change?

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