FYI how to enable web dashboard
microceph.ceph config set mgr mgr/dashboard/ssl false
microceph.ceph mgr module enable dashboard
echo -n "p@ssw0rd" > /var/snap/microceph/current/conf/password.txt
microceph.ceph dashboard ac-user-create -i /etc/ceph/password.txt admin administrator
rm /var/snap/microceph/current/conf/password.txt
voila! you have dashboard on http port 8080 