Comment 6 for bug 2036990

*1 I was very surprised to see missing app data during the new traefik unit being added:

# relation-list -r ingress-internal:7
traefik/0
traefik/1
# relation-get -r ingress-internal:7 - traefik/0 --app
{}
# relation-get -r ingress-internal:7 - traefik/0
egress-subnets: 10.20.21.2/32
ingress-address: 10.20.21.2
private-address: 10.20.21.2
# relation-get -r ingress-internal:7 - traefik/1
egress-subnets: 10.20.21.2/32
ingress-address: 10.20.21.2
private-address: 10.20.21.2

# relation-list -r ingress-internal:8
traefik/0
traefik/1
# relation-get -r ingress-internal:8 - traefik/0 --app
{}
# relation-get -r ingress-internal:8 - traefik/0
egress-subnets: 10.20.21.2/32
ingress-address: 10.20.21.2
private-address: 10.20.21.2
# relation-get -r ingress-internal:8 - traefik/1
egress-subnets: 10.20.21.2/32
ingress-address: 10.20.21.2
private-address: 10.20.21.2