Support non-CRUD subresources (like pod logs)

Hi I am one of the maintainers @kubeflow

We are using kubebuilder to implement some CRDs for Machine Learning/Deep Learning workloads. We meet some problems with the client in controller-runtime.

We need to get the logs of pods using the client, But It seems that controller-runtime client has a higher level abstraction on top of Kubernetes client. Do we have a plan to support expansion (e.g. https://github.com/kubernetes/client-go/blob/master/kubernetes/typed/core/v1/pod_expansion.go) for the client? Or is there any suggestion to do it with controller-runtime client?

Now we have to create a Kubernetes client and use this to get pod logs.

I'd appreciate it if anyone could help me.

Thanks :clinking_glasses: :beers:

Start by reading Kubernetes client-go's pod_expansion.go and the controller-runtime client abstraction to understand how non-CRUD operations are represented. Define the scope for supporting pod logs and similar subresources, then confirm that callers can use the controller-runtime client without creating a separate Kubernetes client.

Written by the indexing model from the issue text.