// initOnlineNodesGauge counts all nodes with status Online and initializes the
// OnlineNode Gauge with it. It also register a callback with the database to be notified
// of nodes going offline.
func initOnlineNodesGauge(store data.Nodeinfostore) {
OnlineNodes.Set(0.0)
for _, status := range store.GetNodeStatusInfos() {
if status.Online {
OnlineNodes.Inc()
}
}
store.NotifyNodeOffline(decrementOnlineNodes)
}
