Official story on kubernetes drone runner?

(for the open source environment, three questions)
1- Is the kubernetes runner deprecated, or not? (one place says it is, another not)
2- If so, then the docker runner (in k8s) is the right and supported way to execute pipelines in k8s?
3- If so, is there a way to define secrets, to be used by the k8s deployed docker runner, other than with the Drone UI (i.e. using Kubernetes Secrets | Drone or some other way of using k8s secrets)?