update internal_ip and external_ip node label for multi-value

Author: stonith

internal/store/node.go

@@ -134,23 +134,36 @@ func createNodeInfoFamilyGenerator() generator.FamilyGenerator {
 				n.Status.NodeInfo.SystemUUID,
 			}
 
-			internalIP := ""
+			internalIPs := []string{}
+			externalIPs := []string{}
 			for _, address := range n.Status.Addresses {
-				if address.Type == "InternalIP" {
-					internalIP = address.Address
+				switch address.Type {
+				case "InternalIP":
+					internalIPs = append(internalIPs, address.Address)
+				case "ExternalIP":
+					externalIPs = append(externalIPs, address.Address)
 				}
 			}
-			labelKeys = append(labelKeys, "internal_ip")
-			labelValues = append(labelValues, internalIP)
 
-			externalIP := ""
-			for _, address := range n.Status.Addresses {
-				if address.Type == "ExternalIP" {
-					externalIP = address.Address
+			if len(internalIPs) > 0 {
+				for _, ip := range internalIPs {
+					labelKeys = append(labelKeys, "internal_ip")
+					labelValues = append(labelValues, ip)
+				}
+			} else {
+				labelKeys = append(labelKeys, "internal_ip")
+				labelValues = append(labelValues, "")
+			}
+
+			if len(externalIPs) > 0 {
+				for _, ip := range externalIPs {
+					labelKeys = append(labelKeys, "external_ip")
+					labelValues = append(labelValues, ip)
 				}
+			} else {
+				labelKeys = append(labelKeys, "external_ip")
+				labelValues = append(labelValues, "")
 			}
-			labelKeys = append(labelKeys, "external_ip")
-			labelValues = append(labelValues, externalIP)
 
 			return &metric.Family{
 				Metrics: []*metric.Metric{

internal/store/node_test.go

@@ -106,6 +106,7 @@ func TestNodeStore(t *testing.T) {
 					},
 					Addresses: []v1.NodeAddress{
 						{Type: "InternalIP", Address: "1.2.3.4"},
+						{Type: "InternalIP", Address: "fc00::"},
 						{Type: "ExternalIP", Address: "5.6.7.8"},
 					},
 					Capacity: v1.ResourceList{
@@ -142,7 +143,7 @@ func TestNodeStore(t *testing.T) {
 		# TYPE kube_node_status_allocatable gauge
 		# TYPE kube_node_status_capacity gauge
 		kube_node_created{node="127.0.0.1"} 1.5e+09
-        kube_node_info{container_runtime_version="rkt",kernel_version="kernel",kubelet_version="kubelet",kubeproxy_version="kubeproxy",node="127.0.0.1",os_image="osimage",pod_cidr="172.24.10.0/24",provider_id="provider://i-randomidentifier",internal_ip="1.2.3.4",external_ip="5.6.7.8",system_uuid="6a934e21-5207-4a84-baea-3a952d926c80"} 1
+        kube_node_info{container_runtime_version="rkt",kernel_version="kernel",kubelet_version="kubelet",kubeproxy_version="kubeproxy",node="127.0.0.1",os_image="osimage",pod_cidr="172.24.10.0/24",provider_id="provider://i-randomidentifier",internal_ip="1.2.3.4",internal_ip="fc00::",external_ip="5.6.7.8",system_uuid="6a934e21-5207-4a84-baea-3a952d926c80"} 1
 		kube_node_role{node="127.0.0.1",role="master"} 1
         kube_node_spec_unschedulable{node="127.0.0.1"} 1
         kube_node_status_allocatable{node="127.0.0.1",resource="cpu",unit="core"} 3