The aforementioned link shows there's been work towards a fix in systemd. Can't say if that suggests what can be done to improve keepalived, but I've tagged this "server-next" to get it on the Ubuntu SErver Team's high priority list, as per Robie's earlier comment.
** Tags added: server-next -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1815101 Title: [master] Restarting systemd-networkd breaks keepalived clusters To manage notifications about this bug go to: https://bugs.launchpad.net/netplan/+bug/1815101/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
