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Documentation Grafana Agent Flow mode Reference Components reference discovery.consul

discovery.consul

discovery.consul allows retrieving scrape targets from Consul’s Catalog API.

Usage

river Copy

discovery.consul "LABEL" {
  server = CONSUL_SERVER
}

Arguments

The following arguments are supported:

At most one of the following can be provided:

• bearer_token argument.
• bearer_token_file argument.
• basic_auth block.
• authorization block.
• oauth2 block.

Blocks

The following blocks are supported inside the definition of discovery.consul:

The > symbol indicates deeper levels of nesting. For example, oauth2 > tls_config refers to a tls_config block defined inside an oauth2 block.

basic_auth block

password and password_file are mutually exclusive and only one can be provided inside of a basic_auth block.

authorization block

credential and credentials_file are mutually exclusive and only one can be provided inside of an authorization block.

oauth2 block

client_secret and client_secret_file are mutually exclusive and only one can be provided inside of an oauth2 block.

The oauth2 block may also contain its own separate tls_config sub-block.

tls_config block

The following pairs of arguments are mutually exclusive and cannot 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:

Each target includes the following labels:

• __meta_consul_address: the address of the target.
• __meta_consul_dc: the datacenter name for the target.
• __meta_consul_health: the health status of the service.
• __meta_consul_partition: the admin partition name where the service is registered.
• __meta_consul_metadata_<key>: each node metadata key value of the target.
• __meta_consul_node: the node name defined for the target.
• __meta_consul_service_address: the service address of the target.
• __meta_consul_service_id: the service ID of the target.
• __meta_consul_service_metadata_<key>: each service metadata key value of the target.
• __meta_consul_service_port: the service port of the target.
• __meta_consul_service: the name of the service the target belongs to.
• __meta_consul_tagged_address_<key>: each node tagged address key value of the target.
• __meta_consul_tags: the list of tags of the target joined by the tag separator.

Component health

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

Debug information

discovery.consul does not expose any component-specific debug information.

Debug metrics

discovery.consul does not expose any component-specific debug metrics.

Example

This example discovers targets from Consul for the specified list of services:

river Copy

discovery.consul "example" {
  server = "localhost:8500"
  services = [
    "service1",
    "service2",
  ]
}

prometheus.scrape "demo" {
  targets    = discovery.consul.example.targets
  forward_to = [prometheus.remote_write.demo.receiver]
}

prometheus.remote_write "demo" {
  endpoint {
    url = PROMETHEUS_REMOTE_WRITE_URL

    basic_auth {
      username = USERNAME
      password = PASSWORD
    }
  }
}

Replace the following:

• 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.