type ZoneState string

const (
	stateInitial           = ZoneState("Initial")
	stateNormal            = ZoneState("Normal")
	stateFullDisruption    = ZoneState("FullDisruption")
	statePartialDisruption = ZoneState("PartialDisruption")
)

const (
	// The amount of time the nodecontroller should sleep between retrying node health updates
	retrySleepTime   = 20 * time.Millisecond
	nodeNameKeyIndex = "spec.nodeName"

    * Change eviction policies in NodeController:
      *  add a "partialDisruption" mode, when more than 33% of Nodes in the zone are not Ready
      *  add "fullDisruption" mode, when all Nodes in the zone are not Ready
    * Eviction behavior depends on the mode in which NodeController is operating: