the biggest problem I had with cloud sql proxy or cloud sql in generell is that postgresql is limited to 100 connections. since I'm a small customer hosting many low traffic projects I want to share my instance as much as possible, however running pgbouncer for a lot of ups is painful since cloudsql does not allow to query the auth table (what's used by pgbouncer if you don't add all database username/password on your own).

I think a lot of problems would be solved if there would be a way to setup cloud sql proxy that comes with transaction pooling, especially when using k8s and having a pooling namespace (multiple load balancers for HA) where all other apps connect to.

also cloud sql and ipv6 is not funny. (i.e. a lot of things in gcp is ipv4 only which is sad)