const nodeControllerSubsystem … const zoneHealthStatisticKey … const zoneSizeKey … const zoneNoUnhealthyNodesKey … const evictionsTotalKey … const updateNodeHealthKey … const updateAllNodesHealthKey … var zoneHealth … var zoneSize … var unhealthyNodes … var evictionsTotal … var updateNodeHealthDuration … var updateAllNodesHealthDuration … var registerMetrics … // Register the metrics that are to be monitored. func Register() { … }