Comment 3 for bug 1398182

+1 we need this added to every relevant OS charm with a service
(in keystone catalog).

As a suggestion, please consider adding some minimal auto-templating, like
#1 public_url: https://{{service_name}}.os.example.com:{{service_port}}/{{service_path}}
or
#2 public_url: https://{{service_type}}.os.example.com:{{service_port}}/{{service_path}}

which would expand to e.g.
#1:
- https://keystone.os.example.com:5000/v2.0
- https://swift-proxy.os.example.com:8080/v1/AUTH_xxx
- https://nova-cloud-controller.os.example.com:8774/v2/yyy
#2:
- https://identity.os.example.com:5000/v2.0
- https://object-store.os.example.com:8080/v1/AUTH_xxx
- https://compute.os.example.com:8774/v2/yyy

FYI above would allow us to set a single 'override:' line at juju-deploy config.