As a part of deployment config, user should be able to specify number of read replicas they want and requests should be automatically load balanced over read repicas.

User, at any point, should also be able to update number of read replicas and accordingy system should adjust.

Future Scopes:

Dynamic Scaling Configuration, where in user can specify minimum and maximum replicas and system should auto scale.

Reference: https://severalnines.com/blog/comparing-load-balancers-postgresql/