Public bug reported:

On some deployments of bionic, using maas and juju, my system ends up
not being able to resolve hostnames. This happens inconsistently, it
seems like a race.

systemd-resolve is showing no nameservers
https://pastebin.canonical.com/p/tyFw8TfSxk

rharper had a look at one reproducing:
17:47 < rharper> jhobbs: ok, I'm not sure how it got into that state; but 
networkd showed all of the DNS servers as configured in it's setting 
(networkctl status) but resolved had none.  I restarted resolvd, that did not 
help; then I downed one of the interfaces (ip link set down eth1.2734; ip link 
set eth1.2734 up) and networkd I guess poked resolved with the list of DNS 
servers and I can see /run/systemd/resovle/* and they are now 17:47 < rharper> 
populated with the configs

here is the netplan: https://pastebin.ubuntu.com/p/8nGXgNmw9q/

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: cdo-qa foundations-engine

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https://bugs.launchpad.net/bugs/1802355

Title:
  systemd-resolve is missing nameservers until interface is bounced

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