Add azure public ip label (#5475)

* Update Azure SD Config with Public IP label

Signed-off-by: earthmant <trammell@cloudify.co>

discovery/azure/azure.go

@@ -48,6 +48,7 @@ const (
 	azureLabelMachineOSType        = azureLabel + "machine_os_type"
 	azureLabelMachineLocation      = azureLabel + "machine_location"
 	azureLabelMachinePrivateIP     = azureLabel + "machine_private_ip"
+	azureLabelMachinePublicIP      = azureLabel + "machine_public_ip"
 	azureLabelMachineTag           = azureLabel + "machine_tag_"
 	azureLabelMachineScaleSet      = azureLabel + "machine_scale_set"
 
@@ -334,6 +335,9 @@ func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
 
 				if *networkInterface.Primary {
 					for _, ip := range *networkInterface.IPConfigurations {
+						if ip.PublicIPAddress != nil {
+							labels[azureLabelMachinePublicIP] = model.LabelValue(*ip.PublicIPAddress.IPAddress)
+						}
 						if ip.PrivateIPAddress != nil {
 							labels[azureLabelMachinePrivateIP] = model.LabelValue(*ip.PrivateIPAddress)
 							address := net.JoinHostPort(*ip.PrivateIPAddress, fmt.Sprintf("%d", d.port))

docs/configuration/configuration.md

@@ -274,6 +274,7 @@ The following meta labels are available on targets during relabeling:
 * `__meta_azure_machine_name`: the machine name
 * `__meta_azure_machine_os_type`: the machine operating system
 * `__meta_azure_machine_private_ip`: the machine's private IP
+* `__meta_azure_machine_public_ip`: the machine's public IP if it exists
 * `__meta_azure_machine_resource_group`: the machine's resource group
 * `__meta_azure_machine_tag_<tagname>`: each tag value of the machine
 * `__meta_azure_machine_scale_set`: the name of the scale set which the vm is part of (this value is only set if you are using a [scale set](https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/))