Please get rid of libberkeleydb-perl which backs the monitoring.
It can be dropped or replaced by zmq. The plan is to get rid of
the transitive dependency libdb5.3 eventually. See blocked bug.

Bastian Germann <bage@debian.org> writes:

Is zmq a drop in replacement? Or does it require coding changes?

I see upstream instructions seem to recommend the use of libzmq3-dev, so
maybe all that needs to happen is replace libberkeleydb-perl with
libzmq3-dev in debian/control, and everything will work as before?

https://gitlab.com/amavis/amavis

My perl know-how is incredibly non-existant, not looked at perl code in
some time.

The problem is that the zmq requirements cannot be met in Debian
currently. That is why I have created
https://gitlab.com/amavis/amavis/-/merge_requests/141