[atlas] Newly-defined traceroute measurement failing with "name resolution failed: non-recoverable failure in name resolution"

Hi,

I have two probes that seem to work just fine; their built-in measurements
work, I can see their results from my "My Atlas" page, etc.  I happened to
notice something weird about the ping times to c.root-servers.net, so
wanted to define a traceroute measurement to see if there were route
changes that could explain what I saw.  However, the only result that I'm
getting is "error": "name resolution failed: non-recoverable failure in
name resolution".

I picked "Resolve on probe", and used "c.root-servers.net" as the
destination.  I'm pretty sure I didn't make a typo, because I've
copy-n-pasted from the dst_name of the result JSON.

For reference, the UDM ID is 1010361 and the probes are 4936 and 4938.
 Each probe has a working DNS server configured, according to the "My
Probes" view.

Thanks for any help,
  Bill

(P.S. I created a new UDM using the IP address, to work around the DNS
problem, but it'd still be nice to understand what I did wrong with the
other one.)
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