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Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.

Open source discovers Azure Virtual Machines and exposes them as targets.


river "LABEL" {


The following arguments are supported:

environmentstringAzure environment."AzurePublicCloud"no
portnumberPort to be appended to the __address__ label for each target.80no
subscription_idstringAzure subscription
refresh_intervaldurationInterval at which to refresh the list of targets.5mno
proxy_urlstringHTTP proxy to proxy requests
follow_redirectsboolWhether redirects returned by the server should be followed.trueno
enable_http2boolWhether HTTP2 is supported for requests.trueno


The following blocks are supported inside the definition of

oauthoauthOAuth configuration for Azure
managed_identitymanaged_identityManaged Identity configuration for Azure
tls_configtls_configTLS configuration for requests to the Azure

Exactly one of the oauth or managed_identity blocks must be specified.

oauth block

The oauth block configures OAuth authentication for the Azure API.

client_idstringOAuth client ID.yes
client_secretstringOAuth client secret.yes
tenant_idstringOAuth tenant ID.yes

managed_identity block

The managed_identity block configures Managed Identity authentication for the Azure API.

client_idstringManaged Identity client ID.yes

tls_config block

ca_pemstringCA PEM-encoded text to validate the server
ca_filestringCA certificate to validate the server
cert_pemstringCertificate PEM-encoded text for client
cert_filestringCertificate file for client
insecure_skip_verifyboolDisables validation of the server
key_filestringKey file for client
key_pemsecretKey PEM-encoded text for client
min_versionstringMinimum acceptable TLS
server_namestringServerName extension to indicate the name of the

The following pairs of arguments are mutually exclusive and can’t both be set simultaneously:

  • ca_pem and ca_file
  • cert_pem and cert_file
  • key_pem and key_file

When configuring client authentication, both the client certificate (using cert_pem or cert_file) and the client key (using key_pem or key_file) must be provided.

When min_version is not provided, the minimum acceptable TLS version is inherited from Go’s default minimum version, TLS 1.2. If min_version is provided, it must be set to one of the following strings:

  • "TLS10" (TLS 1.0)
  • "TLS11" (TLS 1.1)
  • "TLS12" (TLS 1.2)
  • "TLS13" (TLS 1.3)

Exported fields

The following fields are exported and can be referenced by other components:

targetslist(map(string))The set of targets discovered from the Azure API.

Each target includes the following labels:

  • __meta_azure_subscription_id: The Azure subscription ID.
  • __meta_azure_tenant_id: The Azure tenant ID.
  • __meta_azure_machine_id: The UUID of the Azure VM.
  • __meta_azure_machine_resource_group: The name of the resource group the VM is in.
  • __meta_azure_machine_name: The name of the VM.
  • __meta_azure_machine_computer_name: The host OS name of the VM.
  • __meta_azure_machine_os_type: The OS the VM is running (either Linux or Windows).
  • __meta_azure_machine_location: The region the VM is in.
  • __meta_azure_machine_private_ip: The private IP address of the VM.
  • __meta_azure_machine_public_ip: The public IP address of the VM.
  • __meta_azure_machine_tag_*: A tag on the VM. There will be one label per tag.
  • __meta_azure_machine_scale_set: The name of the scale set the VM is in.
  • __meta_azure_machine_size: The size of the VM.

Each discovered VM maps to a single target. The __address__ label is set to the private_ip:port ([private_ip]:port if the private IP is an IPv6 address) of the VM.

Component health is only reported as unhealthy when given an invalid configuration. In those cases, exported fields retain their last healthy values.

Debug information does not expose any component-specific debug information.

Debug metrics does not expose any component-specific debug metrics.


river "example" {
  port = 80
  subscription_id = AZURE_SUBSCRIPTION_ID
  oauth {
      client_id = AZURE_CLIENT_ID
      client_secret = AZURE_CLIENT_SECRET
      tenant_id = AZURE_TENANT_ID

prometheus.scrape "demo" {
  targets    =
  forward_to = [prometheus.remote_write.demo.receiver]

prometheus.remote_write "demo" {
  endpoint {

    basic_auth {
      username = USERNAME
      password = PASSWORD

Replace the following:

  • AZURE_SUBSCRIPTION_ID: Your Azure subscription ID.
  • AZURE_CLIENT_ID: Your Azure client ID.
  • AZURE_CLIENT_SECRET: Your Azure client secret.
  • AZURE_TENANT_ID: Your Azure tenant ID.
  • PROMETHEUS_REMOTE_WRITE_URL: The URL of the Prometheus remote_write-compatible server to send metrics to.
  • USERNAME: The username to use for authentication to the remote_write API.
  • PASSWORD: The password to use for authentication to the remote_write API.