Documentation Grafana Cloud Instrument and send data Grafana Alloy Reference Components discovery discovery.dns

discovery.dns

discovery.dns discovers scrape targets from DNS records.

Usage

alloy Copy

discovery.dns "LABEL" {
  names = [NAME_1, NAME_2, ...]
}

Arguments

The following arguments are supported:

Exported fields

The following field is exported and can be referenced by other components:

Each target includes the following labels:

• __meta_dns_name: Name of the record that produced the discovered target.
• __meta_dns_srv_record_target: Target field of the SRV record.
• __meta_dns_srv_record_port: Port field of the SRV record.
• __meta_dns_mx_record_target: Target field of the MX record.
• __meta_dns_ns_record_target: Target field of the NS record.

Component health

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

Debug information

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

Debug metrics

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

Example

This example discovers targets from an A record.

alloy Copy

discovery.dns "dns_lookup" {
  names = ["myservice.example.com", "myotherservice.example.com"]
  type = "A"
  port = 8080
}

prometheus.scrape "demo" {
  targets    = discovery.dns.dns_lookup.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.

Compatible components

discovery.dns has exports that can be consumed by the following components:

• Components that consume Targets