Discover/document Kubernetes alpha/beta features in use, record required versions
As seen in the demo on Dec 5, 2018:
Some features are in use that may not be enabled on all clusters. We should identify those, and the versions of Kubernetes they are available in as Alpha or better. We need to document these requirements as a part of the chart run-time requirements.
If we can't live without the feature, we should consider gating or removing that piece of the chart in order to allow greater compatibility, or outright require the version of Kubernetes that supports it as a non-Alpha feature.
cc @twk3