Added reset before collecting new metrics to prevent dangling metrics

metrics/pve_node_disk_collector.go

@@ -59,6 +59,10 @@ func (c *PveNodeDiskCollector) CollectMetrics() error {
 		return err
 	}
 
+	c.healthy.Reset()
+	c.wearout.Reset()
+	c.sizeBytes.Reset()
+
 	for _, node := range cluster.NodeStatuses {
 		disks, err := c.apiClient.GetNodeDisksList(node.Name)
 		if err != nil {