Open source


discovery.dns discovers scrape targets from DNS records.


discovery.dns "LABEL" {
  names = [""]


The following arguments are supported:

nameslist(string)DNS names to look up.yes
portnumberPort to use for collecting metrics. Not used for SRV records.0no
refresh_intervaldurationHow often to query DNS for updates."30s"no
typestringType of DNS record to query. Must be one of SRV, A, AAAA, or MX."SRV"no

Exported fields

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

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

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.

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.


This example discovers targets from an A record.

discovery.dns "dns_lookup" {
  names = ["", ""]
  type = "A"
  port = 8080