Version 1:18.0.0-1 of ceilometer is marked for autoremoval from testing on Fri 10 Jun 2022. It depends (transitively) on qpid-proton, affected by #1006562. You should try to prevent the removal by fixing these RC bugs.
Depends on packages which need a new maintainer
normal
The packages that ceilometer depends on which need a new maintainer are: