Profile - Move to per-product namespaces

[olebhansen]

Description

Profile should be moved out of the default namespace. We want to collect namespace changes across multiple applications in order to update as many as possible in one go. New namespace should be profile.

Kubernetes uses ndots:5 in DNS search:
https://pracucci.com/kubernetes-dns-resolution-ndots-options-and-why-it-may-affect-application-performances.html

This means the DNS address we use to access profile should preferably have 5 dots. eg:
http://altinn-profile.profile.svc.cluster.local.
Notice the dot at the end.

In the values file for Notifications this would look like this:

    - name: PlatformSettings__ApiProfileEndpoint
      value: http://altinn-profile.profile.svc.cluster.local./profile/api/v1/

Deploy

Profile cannot be moved into a new namespace in the existing AKS service without some downtime. There are two issues:

1. We can't run Profile in two namespaces at the same time without running into routing limitations. Traefik wouldn't know where to send requests and will probably stop us from setting it up.
2. Multiple other applications use local DNS address in order to send requests to profile. With the change of namespace the address will change. This can be mitigates by having other applications use the public address instead. This would have consequences for performance, but would be for a limited time.

While we have a workaround for issue number 2, issue number 1 is forcing us to use blue-green deploy of platform. We want to update as many applications as possible on a new instance of AKS for then to switch between the AKS instances.

Tasks

• Update release pipeline to deploy Profile to new namespace.
• Update all application references to the DNS address of Profile to use the new address
• Order the creation of namespaces: Team Core needs help setting up some namespaces in k8 for some of their applications altinn-platform#968