[Bug 1895549] Re: Revert dnspython to 1.16.0 in Groovy

[Steve Langasek]

Yes, reverting seems reasonable.  Ideally in the future this would be
detected via autopkgtests on the reverse-dependencies, so that a
rollback isn't required.

** Changed in: dnspython (Ubuntu)
       Status: New => Triaged

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Title:
  Revert dnspython to 1.16.0 in Groovy

Status in dnspython package in Ubuntu:
  Triaged

Bug description:
  dnspython 2.0.0 us not compatible with eventlet [1] and designate [2]
  (and possibly more projects) in Groovy.

  Eventlet and designate aren't patched yet upstream. Upstream is
  actively working on patches but at this point in Groovy I don't see
  this getting resolved unless something lands soon. We're mostly
  concerned with eventlet as it is used throughout openstack projects
  and is tricky code under normal conditions.

  Eventlet is broken in a few different ways with dnspython 2.0.0 as
  noted in [1]. Designate also explicitly depends on APIs that are
  different between the two different versions of dnspython [2].

  Upstream openstack tried to move to 2.0.0 for the openstack vicotoria
  but reverted back to 1.16.0 due to issues with eventlet + dnspython
  2.0.0. Please see: https://review.opendev.org/#/c/741986/

  Due to these incompatibilities, I'd like to revert back to dnspython
  1.16.0 in groovy by uploading a 2.0.0.really.1.16.0-0ubuntu1 version.

  This is blocking milestone 3 uploads for OpenStack Victoria.

  [1] https://github.com/eventlet/eventlet/issues/619
  [2] https://bugs.launchpad.net/designate/+bug/1895285

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