Add PDBs that cover every Pod
Ideally every Pod should be associated with a PodDisruptionBudget so that cluster updates don't kill all the replicas of any app. Details about PDBs here: https://kubernetes.io/docs/concepts/workloads/pods/disruptions/
A reasonable place to start is to set them all to maxUnavailable: 1
. When we're done, kubectl get pdb
should show at least 1 disruption allowed for every PDB which may mean increasing the default replicas too.