const (
	nodeControllerSubsystem = "node_collector"
	zoneHealthStatisticKey  = "zone_health"
	zoneSizeKey             = "zone_size"
	zoneNoUnhealthyNodesKey = "unhealthy_nodes_in_zone"
	evictionsTotalKey       = "evictions_total"

	updateNodeHealthKey     = "update_node_health_duration_seconds"
	updateAllNodesHealthKey = "update_all_nodes_health_duration_seconds"
)

var (
	zoneHealth = metrics.NewGaugeVec(
		&metrics.GaugeOpts{

- Remove a v1alpha1 networking API for ClusterCIDRConfig ([#109436](https://github.com/kubernetes/kubernetes/pull/109436), [@JamesLaverack](https://github.com/JamesLaverack))

			if result {
				// Count the number of evictions.
				zone := nodetopology.GetZoneKey(node)
				evictionsTotal.WithLabelValues(zone).Inc()
			}

			return result, 0
		})
	}
}

// monitorNodeHealth verifies node health are constantly updated by kubelet, and if not, post "NodeReady==ConditionUnknown".