add more context info to client guide (gardener#5203)

* add more context info * Update docs/development/kubernetes-clients.md Co-authored-by: Tim Ebert <timebertt@gmail.com> Co-authored-by: Tim Ebert <timebertt@gmail.com>
nickytd · Dec 21, 2021 · a5d3a55 · a5d3a55
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commit a5d3a55
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diff --git a/docs/development/kubernetes-clients.md b/docs/development/kubernetes-clients.md
@@ -12,6 +12,7 @@ Please familiarize yourself with the following basic Kubernetes API concepts fir
 - [Extending the Kubernetes API](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/) (including Custom Resources and aggregation layer / extension API servers)
 - [Extend the Kubernetes API with CustomResourceDefinitions](https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/)
 - [Working with Kubernetes Objects](https://kubernetes.io/docs/concepts/overview/working-with-objects/)
+- [Sample Controller](https://github.com/kubernetes/sample-controller/blob/master/docs/controller-client-go.md) (the diagram helps to build an understanding of an controller's basic structure)
 
 ## Client Types: Client-Go, Generated, Controller-Runtime
 
@@ -75,6 +76,8 @@ err := c.Update(ctx, deployment)
 err = c.Update(ctx, shoot)
 ```
 
+A brief introduction to controller-runtime and its basic constructs can be found [here](https://pkg.go.dev/sigs.k8s.io/controller-runtime).
+
 _Important characteristics of controller-runtime clients:_
 
 - The client functions take a generic `client.Object` or `client.ObjectList` value. These interfaces are implemented by all Golang types, that represent Kubernetes API objects or lists respectively which can be interacted with via usual API requests. [1]