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Open source


discovery.serverset discovers Serversets stored in Zookeeper and exposes them as targets. Serversets are commonly used by Finagle and Aurora.


discovery.serverset "LABEL" {
	servers = SERVERS_LIST

Serverset data stored in Zookeeper must be in JSON format. The Thrift format is not supported.


The following arguments are supported:

serverslist(string)The Zookeeper servers to connect to.yes
pathslist(string)The Zookeeper paths to discover Serversets from.yes
timeoutdurationThe Zookeeper session timeout10sno

Exported fields

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

targetslist(map(string))The set of targets discovered.

The following metadata labels are available on targets during relabeling:

  • __meta_serverset_path: the full path to the serverset member node in Zookeeper
  • __meta_serverset_endpoint_host: the host of the default endpoint
  • __meta_serverset_endpoint_port: the port of the default endpoint
  • __meta_serverset_endpoint_host_<endpoint>: the host of the given endpoint
  • __meta_serverset_endpoint_port_<endpoint>: the port of the given endpoint
  • __meta_serverset_shard: the shard number of the member
  • __meta_serverset_status: the status of the member

Component health

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

Debug information

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

Debug metrics

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


The configuration below will connect to one of the Zookeeper servers (either zk1, zk2, or zk3) and discover JSON Serversets at paths /path/to/znode1 and /path/to/znode2. The discovered targets are scraped by the prometheus.scrape.default component and forwarded to the prometheus.remote_write.default component, which will send the samples to specified remote_write URL.

discovery.serverset "zookeeper" {
	servers = ["zk1", "zk2", "zk3"]
	paths   = ["/path/to/znode1", "/path/to/znode2"]
	timeout = "30s"

prometheus.scrape "default" {
	targets    = discovery.serverset.zookeeper.targets
	forward_to = [prometheus.remote_write.default.receiver]

prometheus.remote_write "default" {
	endpoint {
		url = "http://remote-write-url1"