Grafana Alloy is the new name for our distribution of the OTel collector. Grafana Agent has been deprecated and is in Long-Term Support (LTS) through October 31, 2025. Grafana Agent will reach an End-of-Life (EOL) on November 1, 2025. Read more about why we recommend migrating to Grafana Alloy.

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


discovery.nerve discovers airbnb/nerve targets stored in Zookeeper.


discovery.nerve "LABEL" {
	servers = [SERVER_1, SERVER_2]
	paths   = [PATH_1, PATH_2]


The following arguments are supported:

serverslist(string)The Zookeeper servers.yes
pathslist(string)The paths to look for targets at.yes
timeoutdurationThe timeout to use."10s"no

Each element in the path list can either point to a single service, or to the root of a tree of services.


The discovery.nerve component does not support any blocks, and is configured fully through arguments.

Exported fields

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

targetslist(map(string))The set of targets discovered from Nerve’s API.

The following meta labels are available on targets and can be used by the discovery.relabel component

  • __meta_nerve_path: the full path to the endpoint node in Zookeeper
  • __meta_nerve_endpoint_host: the host of the endpoint
  • __meta_nerve_endpoint_port: the port of the endpoint
  • __meta_nerve_endpoint_name: the name of the endpoint

Component health

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

Debug information

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

Debug metrics

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


discovery.nerve "example" {
	servers = ["localhost"]
	paths   = ["/monitoring"]
	timeout = "1m"
prometheus.scrape "demo" {
	targets    = discovery.nerve.example.targets
	forward_to = [prometheus.remote_write.demo.receiver]
prometheus.remote_write "demo" {
	endpoint {
		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.