Comment 0 for bug 1773190

Although zone manager and designate pool manager were deprecated in Newton and are scheduled for removal in rocky (https://git.io/vhImI), they are still used by charm-designate.

The change can be be observed by comparing Newton architecture diagram https://docs.openstack.org/designate/queens/contributor/architecture.html

with the one for Queens: https://docs.openstack.org/designate/newton/architecture.html

https://docs.openstack.org/releasenotes/designate/newton.html#upgrade-notes
"To enable designate-worker and designate-producer add a section to your designate.conf called [service:worker] and add an option enabled = True. Then stop designate-pool-manager and designate-zone-manager, and start designate-worker and designate-producer"

https://docs.openstack.org/releasenotes/designate/newton.html#deprecation-notes
"Both designate-zone-manager and designate-pool-manager are now deprecated and will be removed in a future release."

This needs to be taken care of before Rocky to avoid rendering Designate unusable.