Our current cluster seems to use the ancient pause:2.0 container. We also have the pause:3.0 container loaded into our registry, but the update to pause:3.1 seems good: https://github.com/kubernetes/kubernetes/blob/master/build/pause/CHANGELOG.md
We should sort out loading that in and then configuring our kubeadm deploy process to use the internal registry for this core-to-everything-kubernetes container. If we don't we will not be able to run much of anything on this once the admission webhook is deployed.