(Edited to refine scope) Including a container for the Unbound DNS resolver in 16.2 will permit refinement of the existing designate deployment support which is currently in tech preview. (u/s proposed patches https://review.opendev.org/q/Ifccee277393cc9ab095d1785216d3dacfbf3c5ce)
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Red Hat OpenStack Platform (RHOSP) 16.2 enhancement advisory), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2021:3483