discovery/kubernetes: add node name and hostname to endpoints

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

discovery/kubernetes/endpoints.go

@@ -192,6 +192,8 @@ func endpointsSourceFromNamespaceAndName(namespace, name string) string {
 
 const (
 	endpointsNameLabel             = metaLabelPrefix + "endpoints_name"
+	endpointNodeName               = metaLabelPrefix + "endpoint_node_name"
+	endpointHostname               = metaLabelPrefix + "endpoint_hostname"
 	endpointReadyLabel             = metaLabelPrefix + "endpoint_ready"
 	endpointPortNameLabel          = metaLabelPrefix + "endpoint_port_name"
 	endpointPortProtocolLabel      = metaLabelPrefix + "endpoint_port_protocol"
@@ -230,6 +232,13 @@ func (e *Endpoints) buildEndpoints(eps *apiv1.Endpoints) *targetgroup.Group {
 			target[model.LabelName(endpointAddressTargetNameLabel)] = lv(addr.TargetRef.Name)
 		}
 
+		if addr.NodeName != nil {
+			target[model.LabelName(endpointNodeName)] = lv(*addr.NodeName)
+		}
+		if addr.Hostname != "" {
+			target[model.LabelName(endpointHostname)] = lv(addr.Hostname)
+		}
+
 		pod := e.resolvePodRef(addr.TargetRef)
 		if pod == nil {
 			// This target is not a Pod, so don't continue with Pod specific logic.

discovery/kubernetes/endpoints_test.go

@@ -25,6 +25,7 @@ import (
 )
 
 func makeEndpoints() *v1.Endpoints {
+	var nodeName = "foobar"
 	return &v1.Endpoints{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      "testendpoints",
@@ -35,6 +36,8 @@ func makeEndpoints() *v1.Endpoints {
 				Addresses: []v1.EndpointAddress{
 					{
 						IP:       "1.2.3.4",
+						Hostname: "testendpoint1",
+						NodeName: &nodeName,
 					},
 				},
 				Ports: []v1.EndpointPort{
@@ -83,6 +86,8 @@ func TestEndpointsDiscoveryBeforeRun(t *testing.T) {
 				Targets: []model.LabelSet{
 					{
 						"__address__":                              "1.2.3.4:9000",
+						"__meta_kubernetes_endpoint_hostname":      "testendpoint1",
+						"__meta_kubernetes_endpoint_node_name":     "foobar",
 						"__meta_kubernetes_endpoint_port_name":     "testport",
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "true",
@@ -369,6 +374,8 @@ func TestEndpointsDiscoveryWithService(t *testing.T) {
 				Targets: []model.LabelSet{
 					{
 						"__address__":                              "1.2.3.4:9000",
+						"__meta_kubernetes_endpoint_hostname":      "testendpoint1",
+						"__meta_kubernetes_endpoint_node_name":     "foobar",
 						"__meta_kubernetes_endpoint_port_name":     "testport",
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "true",
@@ -435,6 +442,8 @@ func TestEndpointsDiscoveryWithServiceUpdate(t *testing.T) {
 				Targets: []model.LabelSet{
 					{
 						"__address__":                              "1.2.3.4:9000",
+						"__meta_kubernetes_endpoint_hostname":      "testendpoint1",
+						"__meta_kubernetes_endpoint_node_name":     "foobar",
 						"__meta_kubernetes_endpoint_port_name":     "testport",
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "true",
@@ -545,6 +554,8 @@ func TestEndpointsDiscoveryNamespaces(t *testing.T) {
 				Targets: []model.LabelSet{
 					{
 						"__address__":                              "1.2.3.4:9000",
+						"__meta_kubernetes_endpoint_hostname":      "testendpoint1",
+						"__meta_kubernetes_endpoint_node_name":     "foobar",
 						"__meta_kubernetes_endpoint_port_name":     "testport",
 						"__meta_kubernetes_endpoint_port_protocol": "TCP",
 						"__meta_kubernetes_endpoint_ready":         "true",

docs/configuration/configuration.md

@@ -778,6 +778,8 @@ Available meta labels:
 * `__meta_kubernetes_endpoints_name`: The names of the endpoints object.
 * For all targets discovered directly from the endpoints list (those not additionally inferred
   from underlying pods), the following labels are attached:
+  * `__meta_kubernetes_endpoint_hostname`: Hostname of the endpoint.
+  * `__meta_kubernetes_endpoint_node_name`: Name of the node hosting the endpoint.
   * `__meta_kubernetes_endpoint_ready`: Set to `true` or `false` for the endpoint's ready state.
   * `__meta_kubernetes_endpoint_port_name`: Name of the endpoint port.
   * `__meta_kubernetes_endpoint_port_protocol`: Protocol of the endpoint port.