Add support for auto importing of third party cluster registry into ArgoCD

[mikeshng]

Is your feature request related to a problem? Please describe. There are third party projects that has a concept of cluster registry or cluster inventory. These clusters are usually represented by a CRD. For example, in OCM-io the API is ManagedCluster. When a user install the argocd-operator, it will be nice to have an option that allows for auto importing of all these clusters into ArgoCD without the user having to manually add them one by one.

Describe the solution you'd like Add a new optional spec ThirdPartyAutoImport to specify a third party provide for cluster registry auto importing. If the field is populated, the ArgoCD operator will evaluate the value and perform the auto importing in a case by case basis.

Describe alternatives you've considered Scripting the import is possible but not user friendly.

Additional context In OCM-io, there is a CR that can convert a set of ManagedClusters into the ArgoCD cluster secrets. So for the provider implementation of the spec, I imagine it to be creating this import CR using a dynamic client which makes it relatively straight forward.

[mikeshng]

CC @iam-veeramalla

[iam-veeramalla]

Hi @mikeshng , Thanks for the enhancement request.

Can I say on a high level, you are looking for a way to automate the manual cluster adding process (argocd cluster add) ? This looks like a very good enhancement request to me :). If the clusters information is already available as part of ManagedCluster or any other APIs, it makes sense to eliminate the manual effort, specially when the number of clusters is high.

May be we can can add a new controller to the operator which will create a CronJob or a Job that reads the clusters from the ThirdPartyAPIs like ManagedCluster and runs a few argocd cluster add commands using a shell script. We do something similar for Export functionality using the ArgoCDExport controller.

(or) if a new controller is not required, we should think of a way to add this logic to the Argo CD Controller.

Let me know your thoughts 👍🏽

[mikeshng]

@iam-veeramalla this is exactly what we are looking for!

ThirdPartyAPIs sounds good to me. As for the implementation, a new controller that behaves like ArgoCDExport is exactly what we are looking for as well!

If this initial idea is acceptable, we will draft a more detailed enhancement proposal based on your suggestion. Thank you!

[iam-veeramalla]

@mikeshng sure, please feel free to create a detailed enhancement request and link this.