Task: replace platform service DNS with HelmDeployment

[Diaphteiros]

Understand the Task

Description

The sole purpose of platform service DNS is to deploy external-dns onto different clusters. This can easily be expressed by a HelmDeployment.

The advantage is that we could drop the platform service DNS completely and would only need to maintain a single, static YAML manifest instead of a whole controller.

Any further valuable resources.

No response

What is required to accept the Task as done.

Done Criteria

• Design HelmDeployment to produce results equivalent to running platform service DNS.
• Remove platform service DNS from landscapes.
  • Remove deployed external-dns from clusters.
    • Deleting the platform service does not remove its installed external-dns deployments. This either needs to be done manually, or the platform service's configuration is changed so that the cluster selector does not match any Cluster resources anymore, then the platform service should clean up its deployed instances on its own.
• Roll out HelmDeployment on landscapes and verify that it deploys external-dns with correct configuration.
• Include external-dns in OCM umbrella component, if that is not already done.