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Tiago Silva
acad233f53
This PR implements the Kubernetes Tester for the ConnectionDiagnostic feature.
The goal is to validate if the Kubernetes cluster is available and if the user can access it.
A series of checks are performed against Teleport using a Kubernetes Client populated with the user's certificates for accessing the desired cluster.
Currently, the checks are:
- Kubernetes Cluster is up and running
- User's role specifies at least one `kubernetes_groups` or `kubernetes_users`
- User's roles allow RBAC access to the cluster: `kubernetes_labels` match.
- Values specified under `kubernetes_groups` or `kubernetes_users` exist in the cluster and allow the user to list pods in the desired namespace.
Testing:
Post: `/v1/webapi/sites/<teleport-cluster>/diagnostics/connections`
```json
{
"resource_kind": "kube_cluster",
"resource_name": "<cluster_name>",
"kubernetes_namespace": "default"
}
```
Closes #16824