Comment 2 for bug 1830252

Issue is that IP address information is not published on the relation until after the pod is spun up. Charms used to be able to rely on this information being present on the relation during relation-joined and later hooks, but it is no longer the case with k8s charms.

Per discussion with @wallyworld, it may be possible to publish the egress information before the pod is spun up. This should be enough to allow the PostgreSQL charm and interface:pgsql to complete the relation handshaking.