VictoriaMetrics/docs/sd_configs.md

---
sort: 24
weight: 24
title: Prometheus service discovery
menu:
  docs:
    parent: "victoriametrics"
    weight: 24
aliases:
- /sd_configs.html
---

# Prometheus service discovery

# Supported service discovery configs

[vmagent](https://docs.victoriametrics.com/vmagent.html) and [single-node VictoriaMetrics](https://docs.victoriametrics.com/#how-to-scrape-prometheus-exporters-such-as-node-exporter) supports the following Prometheus-compatible service discovery options for Prometheus-compatible scrape targets in the file pointed by `-promscrape.config` command-line flag.

* `azure_sd_configs` is for scraping the targets registered in [Azure Cloud](https://azure.microsoft.com/en-us/). See [these docs](#azure_sd_configs).
* `consul_sd_configs` is for discovering and scraping targets registered in [Consul](https://www.consul.io/). See [these docs](#consul_sd_configs).
* `consulagent_sd_configs` is for discovering and scraping targets registered in [Consul Agent](https://developer.hashicorp.com/consul/api-docs/agent/service). See [these docs](#consulagent_sd_configs).
* `digitalocean_sd_configs` is for discovering and scraping targerts registered in [DigitalOcean](https://www.digitalocean.com/). See [these docs](#digitalocean_sd_configs).
* `dns_sd_configs` is for discovering and scraping targets from [DNS](https://it.wikipedia.org/wiki/Domain_Name_System) records (SRV, A and AAAA). See [these docs](#dns_sd_configs).
* `docker_sd_configs` is for discovering and scraping [Docker](https://www.docker.com/) targets. See [these docs](#docker_sd_configs).
* `dockerswarm_sd_configs` is for discovering and scraping [Docker Swarm](https://docs.docker.com/engine/swarm/) targets. See [these docs](#dockerswarm_sd_configs).
* `ec2_sd_configs` is for discovering and scraping [Amazon EC2](https://aws.amazon.com/ec2/) targets. See [these docs](#ec2_sd_configs).
* `eureka_sd_configs` is for discovering and scraping targets registered in [Netflix Eureka](https://github.com/Netflix/eureka). See [these docs](#eureka_sd_configs).
* `file_sd_configs` is for scraping targets defined in external files (aka file-based service discovery). See [these docs](#file_sd_configs).
* `gce_sd_configs` is for discovering and scraping [Google Compute Engine](https://cloud.google.com/compute) targets. See [these docs](#gce_sd_configs).
* `http_sd_configs` is for discovering and scraping targerts provided by external http-based service discovery. See [these docs](#http_sd_configs).
* `kubernetes_sd_configs` is for discovering and scraping [Kubernetes](https://kubernetes.io/) targets. See [these docs](#kubernetes_sd_configs).
* `kuma_sd_configs` is for discovering and scraping [Kuma](https://kuma.io) targets. See [these docs](#kuma_sd_configs).
* `nomad_sd_configs` is for discovering and scraping targets registered in [HashiCorp Nomad](https://www.nomadproject.io/). See [these docs](#nomad_sd_configs).
* `openstack_sd_configs` is for discovering and scraping OpenStack targets. See [these docs](#openstack_sd_configs).
* `static_configs` is for scraping statically defined targets. See [these docs](#static_configs).
* `yandexcloud_sd_configs` is for discoverying and scraping [Yandex Cloud](https://cloud.yandex.com/en/) targets. See [these docs](#yandexcloud_sd_configs).

Note that the `refresh_interval` option isn't supported for these scrape configs. Use the corresponding `-promscrape.*CheckInterval`
command-line flag instead. For example, `-promscrape.consulSDCheckInterval=60s` sets `refresh_interval` for all the `consul_sd_configs`
entries to 60s. Run `vmagent -help` or `victoria-metrics -help` in order to see default values for the `-promscrape.*CheckInterval` flags.

Please file feature requests to [our issue tracker](https://github.com/VictoriaMetrics/VictoriaMetrics/issues) if you need other service discovery mechanisms to be supported by VictoriaMetrics and `vmagent`.

## azure_sd_configs

Azure SD configuration discovers scrape targets from [Microsoft Azure](https://azure.microsoft.com/en-us/) VMs.

Configuration example:

```yaml
scrape_configs:
- job_name: azure
  azure_sd_configs:

    # subscription_id is a mandatory subscription ID.
  - subscription_id: "..."

    # environment is an optional Azure environment. By default "AzurePublicCloud" is used.
    # environment: "..."

    # authentication_method is an optional authentication method, either OAuth or ManagedIdentity.
    # See https://docs.microsoft.com/en-us/azure/active-directory/managed-identities-azure-resources/overview
    # By default OAuth is used.
    # authentication_method: "..."

    # tenant_id is an optional tenant ID. Only required with authentication_method OAuth.
    # tenant_id: "..."

    # client_id is an optional client ID. Only required with authentication_method OAuth.
    # client_id: "..."

    # client_secret is an optional client secret. Only required with authentication_method OAuth.
    # client_secret: "..."

    # resource_group is an optional resource group name. Limits discovery to this resource group. 
    # resource_group: "..."

    # port is an optional port to scrape metrics from.
    # Port 80 is used by default.
    # port: ...

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to `<private_ip>:<port>`, where `<private_ip>` is the machine's private IP and the `<port>` is the `port`
option specified in the `azure_sd_configs`.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_azure_machine_id`: the machine ID
* `__meta_azure_machine_location`: the location the machine runs in
* `__meta_azure_machine_name`: the machine name
* `__meta_azure_machine_computer_name`: the machine computer name
* `__meta_azure_machine_os_type`: the machine operating system
* `__meta_azure_machine_private_ip`: the machine's private IP
* `__meta_azure_machine_public_ip`: the machine's public IP if it exists
* `__meta_azure_machine_resource_group`: the machine's resource group
* `__meta_azure_machine_scale_set`: the name of the scale set which the vm is part of (this value is only set if you are using a scale set)
* `__meta_azure_machine_size`: the machine size
* `__meta_azure_machine_tag_<tagname>`: each tag value of the machine
* `__meta_azure_subscription_id`: the subscription ID
* `__meta_azure_tenant_id`: the tenant ID

The list of discovered Azure targets is refreshed at the interval, which can be configured via `-promscrape.azureSDCheckInterval` command-line flag.

## consul_sd_configs

Consul SD configuration allows retrieving scrape targets from [Consul's Catalog API](https://www.consul.io/api-docs/catalog).

Configuration example:

```yaml
scrape_configs:
- job_name: consul
  consul_sd_configs:

    # server is an optional Consul server to connect to. By default localhost:8500 is used
  - server: "localhost:8500"

    # token is an optional Consul API token.
    # If the token isn't specified, then it is read from a file pointed by CONSUL_HTTP_TOKEN_FILE
    # environment var or from the CONSUL_HTTP_TOKEN environment var.
    # token: "..."

    # datacenter is an optional Consul API datacenter.
    # If the datacenter isn't specified, then it is read from Consul server.
    # See https://www.consul.io/api-docs/agent#read-configuration
    # datacenter: "..."

    # namespace is an optional Consul namespace.
    # See https://developer.hashicorp.com/consul/docs/enterprise/namespaces
    # If the namespace isn't specified, then it is read from CONSUL_NAMESPACE environment var.
    # namespace: "..."

    # partition is an optional Consul partition.
    # See https://developer.hashicorp.com/consul/docs/enterprise/admin-partitions
    # If partition isn't specified, then the default partition is used.
    # partition: "..."

    # scheme is an optional scheme (http or https) to use for connecting to Consul server.
    # By default http scheme is used.
    # scheme: "..."

    # services is an optional list of services for which targets are retrieved.
    # If omitted, all services are scraped.
    # See https://www.consul.io/api-docs/catalog#list-nodes-for-service .
    # services: ["...", "..."]

    # tags is an optional list of tags used to filter nodes for a given service.
    # Services must contain all tags in the list.
    # Deprecated: use filter instead with ServiceTags selector.
    # tags: ["...", "..."]

    # node_meta is an optional node metadata key/value pairs to filter nodes for a given service.
    # Deprecated: use filter instead with NodeMeta selector.
    # node_meta:
    #   "...": "..."

    # tag_separator is an optional string by which Consul tags are joined into the __meta_consul_tags label.
    # By default "," is used as a tag separator.
    # Individual tags are also available via __meta_consul_tag_<tagname> labels - see below.
    # tag_separator: "..."

    # filter is an optional filter for service discovery.
    # Replaces tags and node_meta options.
    # Consul supports it since 1.14 version.
    # See the list of supported filters at https://developer.hashicorp.com/consul/api-docs/catalog#filtering-1
    # See filter examples at https://developer.hashicorp.com/consul/api-docs/features/filtering
    # filter: "..."

    # allow_stale is an optional config, which allows stale Consul results.
    # See https://www.consul.io/api/features/consistency.html
    # Reduce load on Consul if set to true. By default is is set to true.
    # allow_stale: ...

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to `<service_or_node_addr>:<service_port>`, where `<service_or_node_addr>` is the service address. If the service address is empty,
then the node address is used instead. The `<service_port>` is the service port.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__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_metadata_<key>`: each node metadata key value of the target
* `__meta_consul_namespace`: namespace of the service - see [namespace docs](https://developer.hashicorp.com/consul/docs/enterprise/namespaces)
* `__meta_consul_node`: the node name defined for the target
* `__meta_consul_partition`: partition of the service - see [partition docs](https://developer.hashicorp.com/consul/docs/enterprise/admin-partitions)
* `__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_tag_<tagname>`: the value for the given <tagname> tag of the target
* `__meta_consul_tagpresent_<tagname>`: "true" for every <tagname> tag of the target
* `__meta_consul_tags`: the list of tags of the target joined by the `tag_separator`

The list of discovered Consul targets is refreshed at the interval, which can be configured via `-promscrape.consulSDCheckInterval` command-line flag.

If you have performance issues with consul_sd_configs on a large cluster, then consider using [consulagent_sd_configs](#consulagent_sd_configs) instead.

## consulagent_sd_configs

Consul Agent SD configuration allows retrieving scrape targets from [Consul's Agent API](https://developer.hashicorp.com/consul/api-docs/agent/service).
When using the Agent API, each running vmagent will only get services registered in the local Consul Agent running on the same node when discovering new targets. 
It's suitable for huge clusters for which using the [Catalog API](https://developer.hashicorp.com/consul/api-docs/catalog#list-services) would be too slow or resource intensive, 
in other cases we recommend to use [consul_sd_configs](#consul_sd_configs).

Configuration example:

```yaml
scrape_configs:
- job_name: consul
  consulagent_sd_configs:

    # server is an optional Consul agent to connect to. By default localhost:8500 is used
  - server: "localhost:8500"

    # token is an optional Consul API token.
    # If the token isn't specified, then it is read from a file pointed by CONSUL_HTTP_TOKEN_FILE
    # environment var or from the CONSUL_HTTP_TOKEN environment var.
    # token: "..."

    # datacenter is an optional Consul API datacenter.
    # If the datacenter isn't specified, then it is read from Consul server.
    # See https://www.consul.io/api-docs/agent#read-configuration
    # datacenter: "..."

    # namespace is an optional Consul namespace.
    # See https://developer.hashicorp.com/consul/docs/enterprise/namespaces
    # If the namespace isn't specified, then it is read from CONSUL_NAMESPACE environment var.
    # namespace: "..."

    # scheme is an optional scheme (http or https) to use for connecting to Consul server.
    # By default http scheme is used.
    # scheme: "..."

    # services is an optional list of services for which targets are retrieved.
    # If omitted, all services are scraped.
    # See https://www.consul.io/api-docs/catalog#list-nodes-for-service .
    # services: ["...", "..."]

    # tag_separator is an optional string by which Consul tags are joined into the __meta_consul_tags label.
    # By default "," is used as a tag separator.
    # Individual tags are also available via __meta_consul_tag_<tagname> labels - see below.
    # tag_separator: "..."

    # filter is optional filter for service nodes discovery request. 
    # Replaces tags and node_metadata options.
    # consul supports it since 1.14 version
    # list of supported filters https://developer.hashicorp.com/consul/api-docs/catalog#filtering-1
    # syntax examples https://developer.hashicorp.com/consul/api-docs/features/filtering
    # filter: "..." 

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to `<service_or_node_addr>:<service_port>`, where `<service_or_node_addr>` is the service address. If the service address is empty,
then the node address is used instead. The `<service_port>` is the service port.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_consulagent_address`: the address of the target
* `__meta_consulagent_dc`: the datacenter name for the target
* `__meta_consulagent_health`: the health status of the service
* `__meta_consulagent_metadata_<key>`: each node metadata key value of the target
* `__meta_consulagent_namespace`: namespace of the service - see [namespace docs](https://developer.hashicorp.com/consul/docs/enterprise/namespaces)
* `__meta_consulagent_node`: the node name defined for the target
* `__meta_consulagent_service_address`: the service address of the target
* `__meta_consulagent_service_id`: the service ID of the target
* `__meta_consulagent_service_metadata_<key>`: each service metadata key value of the target
* `__meta_consulagent_service_port`: the service port of the target
* `__meta_consulagent_service`: the name of the service the target belongs to
* `__meta_consulagent_tagged_address_<key>`: each node tagged address key value of the target
* `__meta_consulagent_tag_<tagname>`: the value for the given <tagname> tag of the target
* `__meta_consulagent_tagpresent_<tagname>`: "true" for every <tagname> tag of the target
* `__meta_consulagent_tags`: the list of tags of the target joined by the `tag_separator`

The list of discovered Consul Agent targets is refreshed at the interval, which can be configured via `-promscrape.consulagentSDCheckInterval` command-line flag.

## digitalocean_sd_configs

DigitalOcean SD configuration allows retrieving scrape targets from [DigitalOcean's Droplets API](https://docs.digitalocean.com/reference/api/api-reference/#tag/Droplets).

Configuration example:

```yaml
scrape_configs:
- job_name: digitalocean
  digitalocean_sd_configs:
    # server is an optional DigitalOcean API server to query.
    # By default https://api.digitalocean.com is used.
  - server: "https://api.digitalocean.com"

    # port is an optional port to scrape metrics from. By default port 80 is used.
    # port: ...

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to `<public_ip>:<port>`, where `<public_ip>` is a public ipv4 address of the droplet, while `<port>` is the port specified in the `digitalocean_sd_configs`.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_digitalocean_droplet_id`: the id of the droplet
* `__meta_digitalocean_droplet_name`: the name of the droplet
* `__meta_digitalocean_image`: the slug of the droplet's image
* `__meta_digitalocean_image_name`: the display name of the droplet's image
* `__meta_digitalocean_private_ipv4`: the private IPv4 of the droplet
* `__meta_digitalocean_public_ipv4`: the public IPv4 of the droplet
* `__meta_digitalocean_public_ipv6`: the public IPv6 of the droplet
* `__meta_digitalocean_region`: the region of the droplet
* `__meta_digitalocean_size`: the size of the droplet
* `__meta_digitalocean_status`: the status of the droplet
* `__meta_digitalocean_features`: the comma-separated list of features of the droplet
* `__meta_digitalocean_tags`: the comma-separated list of tags of the droplet
* `__meta_digitalocean_vpc`: the id of the droplet's VPC

The list of discovered DigitalOcean targets is refreshed at the interval, which can be configured via `-promscrape.digitaloceanSDCheckInterval` command-line flag.

## dns_sd_configs

DNS-based service discovery allows retrieving scrape tragets from the specified DNS domain names.
These specified names are periodically queried to discover a list of targets with the interval
configured via `-promscrape.dnsSDCheckInterval` command-line flag.

Configuration example:

```yaml
scrape_configs:
- job_name: dns
  dns_sd_configs:
    # names must contain a list of DNS names to query.
  - names: ["...", "..."]

    # type is an optional type of DNS query to perform.
    # Supported values are: SRV, A, AAAA or MX.
    # By default SRV is used.
    # type: ...

    # port is a port number to use if the query type is not SRV.
    # port: ...
```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to the `<addr>:<port>`, where `<addr>` is the discovered DNS address, while `<port>` is either the discovered port for SRV records or the port
specified in the `dns_sd_config`.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_dns_name`: the record name that produced the discovered target.
* `__meta_dns_srv_record_target`: the target field of the SRV record
* `__meta_dns_srv_record_port`: the port field of the SRV record
* `__meta_dns_mx_record_target`: the target field of the MX record.

The list of discovered DNS targets is refreshed at the interval, which can be configured via `-promscrape.dnsSDCheckInterval` command-line flag.

## docker_sd_configs

Docker SD configuration allows retrieving scrape targets from [Docker Engine](https://docs.docker.com/engine/) hosts.

Configuration example:

```yaml
scrape_configs:
- job_name: docker
  docker_sd_configs:

    # host must contain the address of the Docker daemon.
  - host: "..."

    # port is an optional port to scrape metrics from.
    # By default port 80 is used.
    # port: ...

    # host_networking_host is an optional host to use if the container is in host networking mode.
    # By default localhost is used.
    # host_networking_host: "..."

    # filters is an optional filters to limit the discovery process to a subset of available resources.
    # See https://docs.docker.com/engine/api/v1.40/#operation/ContainerList
    # filters:
    # - name: "..."
    #   values: ["...", "..."]

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to `<ip_address>:<port>`, where `<ip_address>` is the exposed ip address of the docker container, while the `<port>` is either the exposed port
of the docker container or the port specified in the `docker_sd_configs` if the docker container has no exposed ports.
If a container exposes multiple ip addresses, then multiple targets will be discovered - one per each exposed ip address.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_docker_container_id`: the id of the container
* `__meta_docker_container_name`: the name of the container
* `__meta_docker_container_network_mode`: the network mode of the container
* `__meta_docker_container_label_<labelname>`: each label of the container
* `__meta_docker_network_id`: the ID of the network
* `__meta_docker_network_name`: the name of the network
* `__meta_docker_network_ingress`: whether the network is ingress
* `__meta_docker_network_internal`: whether the network is internal
* `__meta_docker_network_label_<labelname>`: each label of the network
* `__meta_docker_network_scope`: the scope of the network
* `__meta_docker_network_ip`: the IP of the container in this network
* `__meta_docker_port_private`: the port on the container
* `__meta_docker_port_public`: the external port if a port-mapping exists
* `__meta_docker_port_public_ip`: the public IP if a port-mapping exists

The list of discovered Docker targets is refreshed at the interval, which can be configured via `-promscrape.dockerSDCheckInterval` command-line flag.

## dockerswarm_sd_configs

Docker Swarm SD configuration allows retrieving scrape targets from [Docker Swarm engine](https://docs.docker.com/engine/swarm/).

Configuration example:

```yaml
scrape_configs:
- job_name: dockerswarm
  dockerswarm_sd_configs:

    # host must contain the address of the Docker daemon.
  - host: "..."

    # role must contain `services`, `tasks` or `nodes` as described below.
    role: ...

    # port is an optional port to scrape metrics from, when `role` is nodes, and for discovered
    # tasks and services that don't have published ports.
    # By default port 80 is used.
    # port: ...

    # filters is an optional filters to limit the discovery process to a subset of available resources.
    # The available filters are listed in the upstream documentation:
    # Services: https://docs.docker.com/engine/api/v1.40/#operation/ServiceList
    # Tasks: https://docs.docker.com/engine/api/v1.40/#operation/TaskList
    # Nodes: https://docs.docker.com/engine/api/v1.40/#operation/NodeList
    # filters:
    # - name: "..."
    #   values: ["...", "..."]

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

One of the following roles can be configured to discover targets:

* `role: services`

  The `services` role discovers all Swarm services.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to `<ip>:<port>`, where `<ip>` is the endpoint's virtual IP, while the `<port>` is the published port of the service.
  If the service has multiple pulbished ports, then multiple targets are generated - one per each port.
  If the service has no published ports, then the `<port>` is set to the `port` value obtained from `dockerswarm_sd_configs`.

  Available meta labels for `role: services` during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_dockerswarm_service_id`: the id of the service
  * `__meta_dockerswarm_service_name`: the name of the service
  * `__meta_dockerswarm_service_mode`: the mode of the service
  * `__meta_dockerswarm_service_endpoint_port_name`: the name of the endpoint port, if available
  * `__meta_dockerswarm_service_endpoint_port_publish_mode`: the publish mode of the endpoint port
  * `__meta_dockerswarm_service_label_<labelname>`: each label of the service
  * `__meta_dockerswarm_service_task_container_hostname`: the container hostname of the target, if available
  * `__meta_dockerswarm_service_task_container_image`: the container image of the target
  * `__meta_dockerswarm_service_updating_status`: the status of the service, if available
  * `__meta_dockerswarm_network_id`: the ID of the network
  * `__meta_dockerswarm_network_name`: the name of the network
  * `__meta_dockerswarm_network_ingress`: whether the network is ingress
  * `__meta_dockerswarm_network_internal`: whether the network is internal
  * `__meta_dockerswarm_network_label_<labelname>`: each label of the network
  * `__meta_dockerswarm_network_scope`: the scope of the network

* `role: tasks`

  The `tasks` role discovers all Swarm tasks.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to `<ip>:<port>`, where the `<ip>` is the node IP, while the `<port>` is the published port of the task.
  If the task has multiple published ports, then multiple targets are generated - one per each port.
  If the task has no published ports, then the `<port>` is set to the `port` value obtained from `dockerswarm_sd_configs`.

  Available meta labels for `role: tasks` during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_dockerswarm_container_label_<labelname>`: each label of the container
  * `__meta_dockerswarm_task_id`: the id of the task
  * `__meta_dockerswarm_task_container_id`: the container id of the task
  * `__meta_dockerswarm_task_desired_state`: the desired state of the task
  * `__meta_dockerswarm_task_slot`: the slot of the task
  * `__meta_dockerswarm_task_state`: the state of the task
  * `__meta_dockerswarm_task_port_publish_mode`: the publish mode of the task port
  * `__meta_dockerswarm_service_id`: the id of the service
  * `__meta_dockerswarm_service_name`: the name of the service
  * `__meta_dockerswarm_service_mode`: the mode of the service
  * `__meta_dockerswarm_service_label_<labelname>`: each label of the service
  * `__meta_dockerswarm_network_id`: the ID of the network
  * `__meta_dockerswarm_network_name`: the name of the network
  * `__meta_dockerswarm_network_ingress`: whether the network is ingress
  * `__meta_dockerswarm_network_internal`: whether the network is internal
  * `__meta_dockerswarm_network_label_<labelname>`: each label of the network
  * `__meta_dockerswarm_network_label`: each label of the network
  * `__meta_dockerswarm_network_scope`: the scope of the network
  * `__meta_dockerswarm_node_id`: the ID of the node
  * `__meta_dockerswarm_node_hostname`: the hostname of the node
  * `__meta_dockerswarm_node_address`: the address of the node
  * `__meta_dockerswarm_node_availability`: the availability of the node
  * `__meta_dockerswarm_node_label_<labelname>`: each label of the node
  * `__meta_dockerswarm_node_platform_architecture`: the architecture of the node
  * `__meta_dockerswarm_node_platform_os`: the operating system of the node
  * `__meta_dockerswarm_node_role`: the role of the node
  * `__meta_dockerswarm_node_status`: the status of the node

  The `__meta_dockerswarm_network_*` meta labels are not populated for ports which are published with `mode=host`.

* `role: nodes`

  The `nodes` role is used to discover Swarm nodes.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to `<ip>:<port>`, where `<ip>` is the node IP, while the `<port>` is the `port` value obtained from the `dockerswarm_sd_configs`.

  Available meta labels for `role: nodes` during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_dockerswarm_node_address`: the address of the node
  * `__meta_dockerswarm_node_availability`: the availability of the node
  * `__meta_dockerswarm_node_engine_version`: the version of the node engine
  * `__meta_dockerswarm_node_hostname`: the hostname of the node
  * `__meta_dockerswarm_node_id`: the ID of the node
  * `__meta_dockerswarm_node_label_<labelname>`: each label of the node
  * `__meta_dockerswarm_node_manager_address`: the address of the manager component of the node
  * `__meta_dockerswarm_node_manager_leader`: the leadership status of the manager component of the node (true or false)
  * `__meta_dockerswarm_node_manager_reachability`: the reachability of the manager component of the node
  * `__meta_dockerswarm_node_platform_architecture`: the architecture of the node
  * `__meta_dockerswarm_node_platform_os`: the operating system of the node
  * `__meta_dockerswarm_node_role`: the role of the node
  * `__meta_dockerswarm_node_status`: the status of the node

The list of discovered Docker Swarm targets is refreshed at the interval, which can be configured via `-promscrape.dockerswarmSDCheckInterval` command-line flag.

## ec2_sd_configs

EC2 SD configuration allows retrieving scrape targets from [AWS EC2 instances](https://aws.amazon.com/ec2/).

Configuration example:

```yaml
scrape_configs:
- job_name: ec2
  ec2_sd_configs:
    # region is an optional config for AWS region.
    # By default the region from the instance metadata is used.
  - region: "..."

    # endpoint is an optional custom AWS API endpoint to use.
    # By default the standard endpoint for the given region is used.
    # endpoint: "..."

    # sts_endpoint is an optional custom STS API endpoint to use.
    # By default the standard endpoint for the given region is used.
    # sts_endpoint: "..."

    # access_key is an optional AWS API access key.
    # By default the access key is loaded from AWS_ACCESS_KEY_ID environment var.
    # access_key: "..."

    # secret_key is an optional AWS API secret key.
    # By default the secret key is loaded from AWS_SECRET_ACCESS_KEY environment var.
    # secret_key: "..."

    # role_arn is an optional AWS Role ARN, an alternative to using AWS API keys.
    # role_arn: "..."

    # port is an optional port to scrape metrics from.
    # By default port 80 is used.
    # port: ...

    # filters is an optional filters for the instance list.
    # Available filter criteria can be found here:
    # https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeInstances.html
    # Filter API documentation: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_Filter.html
    # filters:
    # - name: "..."
    #   values: ["...", "..."]

    # az_filters is an optional filters for the availability zones list.
    # Available filter criteria can be found here:
    # https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeAvailabilityZones.html
    # Filter API documentation: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_Filter.html
    # az_filters:
    # - name: "..."
    #   values: ["...", "..."]
```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to `<instance_ip>:<port>`, where `<instance_ip>` is the private IP of the instance, while the `<port>` is set to the `port` value
obtaine from `ec2_sd_configs`.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_ec2_ami`: the EC2 Amazon Machine Image
* `__meta_ec2_architecture`: the architecture of the instance
* `__meta_ec2_availability_zone`: the availability zone in which the instance is running
* `__meta_ec2_availability_zone_id`: the availability zone ID in which the instance is running (requires ec2:DescribeAvailabilityZones)
* `__meta_ec2_instance_id`: the EC2 instance ID
* `__meta_ec2_instance_lifecycle`: the lifecycle of the EC2 instance, set only for 'spot' or 'scheduled' instances, absent otherwise
* `__meta_ec2_instance_state`: the state of the EC2 instance
* `__meta_ec2_instance_type`: the type of the EC2 instance
* `__meta_ec2_ipv6_addresses`: comma separated list of IPv6 addresses assigned to the instance's network interfaces, if present
* `__meta_ec2_owner_id`: the ID of the AWS account that owns the EC2 instance
* `__meta_ec2_platform`: the Operating System platform, set to 'windows' on Windows servers, absent otherwise
* `__meta_ec2_primary_subnet_id`: the subnet ID of the primary network interface, if available
* `__meta_ec2_private_dns_name`: the private DNS name of the instance, if available
* `__meta_ec2_private_ip`: the private IP address of the instance, if present
* `__meta_ec2_public_dns_name`: the public DNS name of the instance, if available
* `__meta_ec2_public_ip`: the public IP address of the instance, if available
* `__meta_ec2_region`: EC2 region for the discovered instance
* `__meta_ec2_subnet_id`: comma separated list of subnets IDs in which the instance is running, if available
* `__meta_ec2_tag_<tagkey>`: each tag value of the instance
* `__meta_ec2_vpc_id`: the ID of the VPC in which the instance is running, if available

The list of discovered EC2 targets is refreshed at the interval, which can be configured via `-promscrape.ec2SDCheckInterval` command-line flag.

## eureka_sd_configs

Eureka SD configuration allows retrieving scrape targets using the [Eureka REST API](https://github.com/Netflix/eureka/wiki/Eureka-REST-operations).

Configuration example:

```yaml
scrape_configs:
- job_name: eureka
  eureka_sd_configs:
    # server is an optional URL to connect to the Eureka server.
    # By default The http://localhost:8080/eureka/v2 is used.
  - server: "..."

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to `<instance_host>:<instance_port>`, where `<instance_host>` is the discovered instance hostname, while the `<instance_port>`
is the discovered instance port. If the instance has no port, then port 80 is used.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_eureka_app_name`: the name of the app
* `__meta_eureka_app_instance_id`: the ID of the app instance
* `__meta_eureka_app_instance_hostname`: the hostname of the instance
* `__meta_eureka_app_instance_homepage_url`: the homepage url of the app instance
* `__meta_eureka_app_instance_statuspage_url`: the status page url of the app instance
* `__meta_eureka_app_instance_healthcheck_url`: the health check url of the app instance
* `__meta_eureka_app_instance_ip_addr`: the IP address of the app instance
* `__meta_eureka_app_instance_vip_address`: the VIP address of the app instance
* `__meta_eureka_app_instance_secure_vip_address`: the secure VIP address of the app instance
* `__meta_eureka_app_instance_status`: the status of the app instance
* `__meta_eureka_app_instance_port`: the port of the app instance
* `__meta_eureka_app_instance_port_enabled`: the port enabled of the app instance
* `__meta_eureka_app_instance_secure_port`: the secure port address of the app instance
* `__meta_eureka_app_instance_secure_port_enabled`: the secure port of the app instance
* `__meta_eureka_app_instance_country_id`: the country ID of the app instance
* `__meta_eureka_app_instance_metadata_<metadataname>`: app instance metadata
* `__meta_eureka_app_instance_datacenterinfo_name`: the datacenter name of the app instance
* `__meta_eureka_app_instance_datacenterinfo_metadata_<metadataname>`: the datacenter metadata

The list of discovered Eureka targets is refreshed at the interval, which can be configured via `-promscrape.eurekaSDCheckInterval` command-line flag.

## file_sd_configs

File-based service discovery reads a set of files with lists of targets to scrape.

Configuration example:

```yaml
scrape_configs:
- job_name: file
  file_sd_configs:
    # files must contain a list of file patterns for files with scrape targets.
    # The last path segment can contain `*`, which matches any number of chars in file name.
  - files:
    - "my/path/*.yaml"
    - "another/path.json"
```

Files must contain a list of static configs in one of the following formats:

* JSON:

  ```json
  [
    {
      "targets": ["<host>", ... ],
      "labels": {
        "<labelname>": "<labelvalue>",
        ...,
      }
    },
    ...
  ]
  ```

* YAML:

  ```yaml
  - targets: ["<host>", ... ]
    labels:
      <labelname>: <labelvalue>
      ...
    ...
  ```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to one of the `target` value specified in the target files.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_filepath`: the filepath from which the target was extracted

See the [list of integrations](https://prometheus.io/docs/operating/integrations/#file-service-discovery) with `file_sd_configs`.

The list of discovered file-based targets is refreshed at the interval, which can be configured via `-promscrape.fileSDCheckInterval` command-line flag.

## gce_sd_configs

GCE SD configuration allows retrieving scrape targets from [GCP GCE instances](https://cloud.google.com/compute).

Configuration example:

```yaml
scrape_configs:
- job_name: gce
  gce_sd_configs:
    # project is an optional GCE project where targets must be discovered.
    # By default the local project is used.
  - project: "..."

    # zone is an optional zone where targets must be discovered.
    # By default the local zone is used.
    # If zone equals to '*', then targets in all the zones for the given project are discovered.
    # The zone may contain a list of zones: zone["us-east1-a", "us-east1-b"]
    # zone: "..."

    # filter is an optional filter for the instance list.
    # See https://cloud.google.com/compute/docs/reference/latest/instances/list
    # filter: "..."

    # port is an optional port to scrape metrics from.
    # By default port 80 is used.
    # port: ...

    # tag_separator is an optional separator for tags in `__meta_gce_tags` label.
    # By default "," is used.
    # tag_separator: "..."
```

Credentials are discovered by looking in the following places, preferring the first location found:

1. a JSON file specified by the `GOOGLE_APPLICATION_CREDENTIALS` environment variable
2. a JSON file in the well-known path `$HOME/.config/gcloud/application_default_credentials.json`
3. fetched from the GCE metadata server

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to `<iface_ip>:<port>`, where `<iface_ip>` is private IP of the discovered instance, while `<port>` is the `port` value
specified in the `gce_sd_configs`.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_gce_instance_id`: the numeric id of the instance
* `__meta_gce_instance_name`: the name of the instance
* `__meta_gce_label_<labelname>`: each GCE label of the instance
* `__meta_gce_machine_type`: full or partial URL of the machine type of the instance
* `__meta_gce_metadata_<name>`: each metadata item of the instance
* `__meta_gce_network`: the network URL of the instance
* `__meta_gce_private_ip`: the private IP address of the instance
* `__meta_gce_interface_ipv4_<name>`: IPv4 address of each named interface
* `__meta_gce_project`: the GCP project in which the instance is running
* `__meta_gce_public_ip`: the public IP address of the instance, if present
* `__meta_gce_subnetwork`: the subnetwork URL of the instance
* `__meta_gce_tags`: list of instance tags separated by tag_separator
* `__meta_gce_zone`: the GCE zone URL in which the instance is running

The list of discovered GCE targets is refreshed at the interval, which can be configured via `-promscrape.gceSDCheckInterval` command-line flag.

## http_sd_configs

HTTP-based service discovery fetches targets from the specified `url`.

Configuration example:

```yaml
scrape_configs:
- job_name: http
  http_sd_configs:
    # url must contain the URL from which the targets are fetched.
  - url: "http://..."

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

The service at `url` must return JSON response in the following format:

```json
[
  {
    "targets": [ "<host>", ... ],
    "labels": {
      "<labelname>": "<labelvalue>",
      ...
    }
  },
  ...
]
```

The `url` is queried periodically with the interval specified in `-promscrape.httpSDCheckInterval` command-line flag.
Discovery errors are tracked in `promscrape_discovery_http_errors_total` metric.

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to one of the targets returned by the http service.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_url`: the URL from which the target was extracted

The list of discovered HTTP-based targets is refreshed at the interval, which can be configured via `-promscrape.httpSDCheckInterval` command-line flag.

## kubernetes_sd_configs

Kubernetes SD configuration allows retrieving scrape targets from [Kubernetes REST API](https://kubernetes.io/docs/reference/using-api/).

Configuration example:

```yaml
scrape_configs:
- job_name: kubernetes
  kubernetes_sd_configs:

    # role must contain the Kubernetes role of entities that should be discovered.
    # It must have one of the following values:
    # endpoints, endpointslice, service, pod, node or ingress.
    # See docs below about each particular role.
  - role: "..."

    # api_server is an optional url for Kubernetes API server.
    # By default it is read from /var/run/secrets/kubernetes.io/serviceaccount/
    # api_server: "..."

    # kubeconfig_file is an optional path to a kubeconfig file.
    # Note that api_server and kubeconfig_file are mutually exclusive.
    # kubeconfig_file: "..."

    # namespaces is an optional namespace for service discovery.
    # By default all namespaces are used.
    # If own_namespace is set to true, then the current namespace is used for service discovery.
    # namespaces:
    #   own_namespace: <boolean>
    #   names: ["...", "..."]

    # selects is an optional label and field selectors to limit the discovery process to a subset of available resources.
    # See https://kubernetes.io/docs/concepts/overview/working-with-objects/field-selectors/
    # and https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/
    # The `role: endpoints` supports pod, service and endpoints selectors.
    # The `role: pod` supports node selectors when configured with `attach_metadata: {node: true}`.
    # Other roles only support selectors matching the role itself (e.g. node role can only contain node selectors).
    # selectors:
    # - role: "..."
    #   label: "..."
    #   field: "..."

    # attach_metadata is an optional metadata to attach to discovered targets.
    # When `node` is set to true, then node metadata is attached to discovered targets.
    # Valid for roles: pod, endpoints, endpointslice.
    # attach_metadata:
    #   node: <boolean>

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

One of the following `role` types can be configured to discover targets:

* `role: node`

  The `role: node` discovers one target per cluster node.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to `<ip>:<port>`, where `<ip>` is to the first existing address of the Kubernetes node object in the address type order
  of `NodeInternalIP`, `NodeExternalIP`, `NodeLegacyHostIP` and `NodeHostName`,
  while `<port>` is the kubelet's port on the given node.

  Available meta labels for `role: node` during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_kubernetes_node_name`: The name of the node object.
  * `__meta_kubernetes_node_provider_id`: The cloud provider's name for the node object.
  * `__meta_kubernetes_node_label_<labelname>`: Each label from the node object.
  * `__meta_kubernetes_node_labelpresent_<labelname>`: "true" for each label from the node object.
  * `__meta_kubernetes_node_annotation_<annotationname>`: Each annotation from the node object.
  * `__meta_kubernetes_node_annotationpresent_<annotationname>`: "true" for each annotation from the node object.
  * `__meta_kubernetes_node_address_<address_type>`: The first address for each node address type, if it exists.

  In addition, the `instance` label for the node will be set to the node name as retrieved from the API server.

* `role: service`

  The `role: service` discovers Kubernetes services.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to `<service_name>.<namespace>:<port>`, where `<service_name>` is the service name, `<namespace>` is the service namespace
  and `<port>` is the service port.
  If the service has multiple ports, then multiple targets are discovered for the service - one per each port.

  This is generally useful for blackbox monitoring of a service. The target address will be set to the Kubernetes DNS name
  of the service and respective service port.

  Available meta labels for `role: service` during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_kubernetes_namespace`: The namespace of the service object.
  * `__meta_kubernetes_service_annotation_<annotationname>`: Each annotation from the service object.
  * `__meta_kubernetes_service_annotationpresent_<annotationname>`: "true" for each annotation of the service object.
  * `__meta_kubernetes_service_cluster_ip`: The cluster IP address of the service. (Does not apply to services of type ExternalName)
  * `__meta_kubernetes_service_external_name`: The DNS name of the service. (Applies to services of type ExternalName)
  * `__meta_kubernetes_service_label_<labelname>`: Each label from the service object.
  * `__meta_kubernetes_service_labelpresent_<labelname>`: "true" for each label of the service object.
  * `__meta_kubernetes_service_name`: The name of the service object.
  * `__meta_kubernetes_service_port_name`: Name of the service port for the target.
  * `__meta_kubernetes_service_port_number`: Service port number for the target.
  * `__meta_kubernetes_service_port_protocol`: Protocol of the service port for the target.
  * `__meta_kubernetes_service_type`: The type of the service.

* `role: pod`

  The `role: pod` discovers all pods and exposes their containers as targets.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to `<ip>:<port>`, where `<ip>` is pod IP, while `<port>` is the exposed container port.
  If the pod has multiple container ports, then multiple targets are generated for the pod - one per each exposed container port.
  If the pod has no exposed container ports, then the `__address__` for pod target is set to the pod IP.

  Available meta labels for `role: pod` during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_kubernetes_namespace`: The namespace of the pod object.
  * `__meta_kubernetes_pod_name`: The name of the pod object.
  * `__meta_kubernetes_pod_ip`: The pod IP of the pod object.
  * `__meta_kubernetes_pod_label_<labelname>`: Each label from the pod object.
  * `__meta_kubernetes_pod_labelpresent_<labelname>`: "true" for each label from the pod object.
  * `__meta_kubernetes_pod_annotation_<annotationname>`: Each annotation from the pod object.
  * `__meta_kubernetes_pod_annotationpresent_<annotationname>`: "true" for each annotation from the pod object.
  * `__meta_kubernetes_pod_container_id`: ID of the container in the form `<type>://<container_id>`.
  * `__meta_kubernetes_pod_container_image`: Container image the target address points to.
  * `__meta_kubernetes_pod_container_init`: "true" if the container is an InitContainer.
  * `__meta_kubernetes_pod_container_name`: Name of the container the target address points to.
  * `__meta_kubernetes_pod_container_port_name`: Name of the container port.
  * `__meta_kubernetes_pod_container_port_number`: Number of the container port.
  * `__meta_kubernetes_pod_container_port_protocol`: Protocol of the container port.
  * `__meta_kubernetes_pod_ready`: Set to true or false for the pod's ready state.
  * `__meta_kubernetes_pod_phase`: Set to Pending, Running, Succeeded, Failed or Unknown in the lifecycle.
  * `__meta_kubernetes_pod_node_name`: The name of the node the pod is scheduled onto.
  * `__meta_kubernetes_pod_host_ip`: The current host IP of the pod object.
  * `__meta_kubernetes_pod_uid`: The UID of the pod object.
  * `__meta_kubernetes_pod_controller_kind`: Object kind of the pod controller.
  * `__meta_kubernetes_pod_controller_name`: Name of the pod controller.

* `role: endpoints`

  The `role: endpoints` discovers targets from listed endpoints of a service.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to `<addr>:<port>`, where `<addr>` is the endpoint address, while `<port>` is the endpoint port.
  If the endpoint has multiple ports, then a single target per each port is generated.
  If the endpoint is backed by a pod, all additional container ports of the pod, not bound to an endpoint port, are discovered as targets as well.

  Available meta labels for `role: endpoints` during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_kubernetes_namespace`: The namespace of the endpoints object.
  * `__meta_kubernetes_endpoints_name`: The names of the endpoints object.
  * `__meta_kubernetes_endpoints_label_<labelname>`: Each label from the endpoints object.
  * `__meta_kubernetes_endpoints_labelpresent_<labelname>`: "true" for each label from the endpoints object.

  For all targets discovered directly from the endpoints list (those not additionally inferred from underlying pods), the following labels are attached:

  * `__meta_kubernetes_endpoint_hostname`: Hostname of the endpoint.
  * `__meta_kubernetes_endpoint_node_name`: Name of the node hosting the endpoint.
  * `__meta_kubernetes_endpoint_ready`: Set to true or false for the endpoint's ready state.
  * `__meta_kubernetes_endpoint_port_name`: Name of the endpoint port.
  * `__meta_kubernetes_endpoint_port_protocol`: Protocol of the endpoint port.
  * `__meta_kubernetes_endpoint_address_target_kind`: Kind of the endpoint address target.
  * `__meta_kubernetes_endpoint_address_target_name`: Name of the endpoint address target.

  If the endpoints belong to a service, all labels of the `role: service` are attached.
  For all targets backed by a pod, all labels of the `role: pod` are attached.

* `role: endpointslice`

  The `role: endpointslice` discovers targets from existing endpointslices.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to `<addr>:<port>`, where `<addr>` is the endpoint address, while `<port>` is the endpoint port.
  If the endpoint has multiple ports, then a single target per each port is generated.
  If the endpoint is backed by a pod, all additional container ports of the pod, not bound to an endpoint port, are discovered as targets as well.

  Available meta labels for `role: endpointslice` during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_kubernetes_namespace`: The namespace of the endpoints object.
  * `__meta_kubernetes_endpointslice_name`: The name of endpointslice object.

  For all targets discovered directly from the endpointslice list (those not additionally inferred from underlying pods), the following labels are attached:

  * `__meta_kubernetes_endpointslice_address_target_kind`: Kind of the referenced object.
  * `__meta_kubernetes_endpointslice_address_target_name`: Name of referenced object.
  * `__meta_kubernetes_endpointslice_address_type`: The ip protocol family of the address of the target.
  * `__meta_kubernetes_endpointslice_endpoint_conditions_ready`: Set to true or false for the referenced endpoint's ready state.
  * `__meta_kubernetes_endpointslice_endpoint_topology_kubernetes_io_hostname`: Name of the node hosting the referenced endpoint.
  * `__meta_kubernetes_endpointslice_endpoint_topology_present_kubernetes_io_hostname`: Flag that shows if the referenced object has a kubernetes.io/hostname annotation.
  * `__meta_kubernetes_endpointslice_port`: Port of the referenced endpoint.
  * `__meta_kubernetes_endpointslice_port_name`: Named port of the referenced endpoint.
  * `__meta_kubernetes_endpointslice_port_protocol`: Protocol of the referenced endpoint.

  If the endpoints belong to a service, all labels of the `role: service` are attached.
  For all targets backed by a pod, all labels of the `role: pod` are attached.

* `role: ingress`

  The `role: ingress` discovers a target for each path of each ingress.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to the host obtained from ingress spec.
  If the ingress has multiple specs with multiple hosts, then a target per each host is created.

  This is generally useful for blackbox monitoring of an ingress.

  Available meta labels for `role: ingress` during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_kubernetes_namespace`: The namespace of the ingress object.
  * `__meta_kubernetes_ingress_name`: The name of the ingress object.
  * `__meta_kubernetes_ingress_label_<labelname>`: Each label from the ingress object.
  * `__meta_kubernetes_ingress_labelpresent_<labelname>`: "true" for each label from the ingress object.
  * `__meta_kubernetes_ingress_annotation_<annotationname>`: Each annotation from the ingress object.
  * `__meta_kubernetes_ingress_annotationpresent_<annotationname>`: "true" for each annotation from the ingress object.
  * `__meta_kubernetes_ingress_class_name`: Class name from ingress spec, if present.
  * `__meta_kubernetes_ingress_scheme`: Protocol scheme of ingress, https if TLS config is set. Defaults to http.
  * `__meta_kubernetes_ingress_path`: Path from ingress spec. Defaults to `/`.

The list of discovered Kuberntes targets is refreshed at the interval, which can be configured via `-promscrape.kubernetesSDCheckInterval` command-line flag.

## kuma_sd_configs

Kuma service discovery config allows to fetch targets from the specified control plane `server` of [Kuma Service Mesh](https://kuma.io).

It discovers "monitoring assignments" based on Kuma Dataplane Proxies, 
via the [MADS (Monitoring Assignment Discovery Service)](https://kuma.io/docs/2.1.x/policies/traffic-metrics/#traffic-metrics) 
[xDS RESP API](http://envoyproxy.io/docs/envoy/latest/api-docs/xds_protocol).

Configuration example:

```yaml
scrape_configs:
- job_name: kuma
  kuma_sd_configs:
    # server must contain the URL of Kuma Control Plane's MADS xDS server.
  - server: "http://localhost:5676"

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

The `server` is queried periodically with the interval specified in `-promscrape.kumaSDCheckInterval` command-line flag.
Discovery errors are tracked in `promscrape_discovery_kuma_errors_total` metric.

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to one of the targets returned by the http service.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_kuma_mesh`: the name of the mesh
* `__meta_kuma_dataplane`: the name of the proxy
* `__meta_kuma_service`: the name of the service associated with the proxy
* `__meta_kuma_label_<label_name>`: each label of target given from Kuma Control Plane

The list of discovered Kuma targets is refreshed at the interval, which can be configured via `-promscrape.kumaSDCheckInterval` command-line flag.

## nomad_sd_configs

Nomad SD configuration allows retrieving scrape targets from [HashiCorp Nomad Services](https://www.hashicorp.com/blog/nomad-service-discovery).

Configuration example:

```yaml
scrape_configs:
- job_name: nomad
  nomad_sd_configs:

    # server is an optional Nomad server to connect to.
    # If the server isn't specified, then it is read from NOMAD_ADDR environment var.
    # If the NOMAD_ADDR environment var isn't set, then localhost:4646 is used.
  - server: "localhost:4646"

    # namespace is an optional Nomad namespace.
    # If the namespace isn't specified, then it is read from NOMAD_NAMESPACE environment var.
    # namespace: "..."

    # region is an optional Nomad region.
    # If the region isn't specified, then it is read from NOMAD_REGION environment var.
    # If NOMAD_REGION environment var isn't set, then "global" region is used
    # region: "..."

    # tag_separator is an optional string by which Nomad tags are joined into the __meta_nomad_tags label.
    # By default "," is used as a tag separator.
    # Individual tags are also available via __meta_nomad_tag_<tagname> labels - see below.
    # tag_separator: "..."

    # allow_stale is an optional config, which allows stale Nomad results.
    # See https://developer.hashicorp.com/nomad/api-docs#consistency-modes
    # Reduces load on Nomad if set to true. By default is is set to true.
    # allow_stale: ...

    # Additional HTTP API client options can be specified here.
    # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to `<addr>:<port>`, where `<addr>` is the service address, while `<port>` is the service port.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_nomad_address`: the address of the target
* `__meta_nomad_dc`: the datacenter name for the target
* `__meta_nomad_namespace`: namespace of the service
* `__meta_nomad_node_id`: the node ID defined for the target
* `__meta_nomad_service`: the name of the service the target belongs to
* `__meta_nomad_service_address`: the service address of the target
* `__meta_nomad_service_alloc_id`: the AllocID of the target service
* `__meta_nomad_service_id`: the ID of the target service
* `__meta_nomad_service_job_id`: the JobID of the target service
* `__meta_nomad_service_port`: the service port of the target
* `__meta_nomad_tag_<tagname>`: the value for the given <tagname> tag of the target
* `__meta_nomad_tagpresent_<tagname>`: "true" for every <tagname> tag of the target
* `__meta_nomad_tags`: the list of tags of the target joined by the `tag_separator`

The list of discovered Nomad targets is refreshed at the interval, which can be configured via `-promscrape.nomadSDCheckInterval` command-line flag.

## openstack_sd_configs

OpenStack SD configuration allows retrieving scrape targets from [OpenStack Nova](https://docs.openstack.org/nova/latest/) instances.

[OpenStack identity API v3](https://docs.openstack.org/api-ref/identity/v3/) is supported only.

Configuration example:

```yaml
scrape_configs:
- job_name: openstack
  openstack_sd_configs:

    # role must contain either `hypervisor` or `instance`.
    # See docs below for details.
  - role: "..."

    # region must contain OpenStack region for targets' discovery.
    region: "..."

    # identity_endpoint is an optional HTTP Identity API endpoint.
    # By default it is read from OS_AUTH_URL environment variable.
    # identity_endpoint: "..."

    # username is an optional username to query Identity API.
    # By default it is read from OS_USERNAME environment variable.
    # username: "..."

    # userid is an optional userid to query Identity API.
    # By default it is read from OS_USERID environment variable.
    # userid: "..."

    # password is an optional password to query Identity API.
    # By default it is read from OS_PASSWORD environment variable.
    # password: "..."

    # At most one of domain_id and domain_name must be provided.
    # By default they are read from OS_DOMAIN_NAME and OS_DOMAIN_ID environment variables.
    # domain_name: "..."
    # domain_id: "..."

    # project_name and project_id are optional project name and project id.
    # By default is is read from OS_PROJECT_NAME and OS_PROJECT_ID environment variables.
    # If these vars are emtpy, then the options are read
    # from OS_TENANT_NAME and OS_TENANT_ID environment variables.
    # project_name: "..."
    # project_id: "..."

    # By default these fields are read from OS_APPLICATION_CREDENTIAL_NAME
    # and OS_APPLICATION_CREDENTIAL_ID environment variables
    # application_credential_name: "..."
    # application_credential_id: "..."

    # By default this field is read from OS_APPLICATION_CREDENTIAL_SECRET
    # application_credential_secret: "..."

    # all_tenants can be set to true if all instances in all projects must be discovered.
    # It is only relevant for the 'role: instance' and usually requires admin permissions.
    # all_tenants: ...

    # port is an optional port to scrape metrics from.
    # Port 80 is used by default.
    # port: ...

    # availability is the availability of the endpoint to connect to.
    # Must be one of public, admin or internal.
    # By default it is set to public
    # availability: "..."

    # tls_config is an optional tls config.
    # See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#tls_config
    # tls_config:
    #   ...
```

One of the following `role` types can be configured to discover targets:

* `role: hypervisor`

  The `role: hypervisor` discovers one target per Nova hypervisor node.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to `<host>:<port>`, where `<host>` is the discovered node IP, while `<port>` is the port specified in the `openstack_sd_configs`.

  The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_openstack_hypervisor_host_ip`: the hypervisor node's IP address.
  * `__meta_openstack_hypervisor_hostname`: the hypervisor node's name.
  * `__meta_openstack_hypervisor_id`: the hypervisor node's ID.
  * `__meta_openstack_hypervisor_state`: the hypervisor node's state.
  * `__meta_openstack_hypervisor_status`: the hypervisor node's status.
  * `__meta_openstack_hypervisor_type`: the hypervisor node's type.

* `role: instance`

  The `role: instance` discovers one target per network interface of Nova instance.

  Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
  to `<host>:<port>`, where `<host>` is the private IP address of the discovered instance, while `<port>` is the port specified in the `openstack_sd_configs`.

  The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

  * `__meta_openstack_address_pool`: the pool of the private IP.
  * `__meta_openstack_instance_flavor`: the flavor of the OpenStack instance.
  * `__meta_openstack_instance_id`: the OpenStack instance ID.
  * `__meta_openstack_instance_name`: the OpenStack instance name.
  * `__meta_openstack_instance_status`: the status of the OpenStack instance.
  * `__meta_openstack_private_ip`: the private IP of the OpenStack instance.
  * `__meta_openstack_project_id`: the project (tenant) owning this instance.
  * `__meta_openstack_public_ip`: the public IP of the OpenStack instance.
  * `__meta_openstack_tag_<tagkey>`: each tag value of the instance.
  * `__meta_openstack_user_id`: the user account owning the tenant.

The list of discovered OpenStack targets is refreshed at the interval, which can be configured via `-promscrape.openstackSDCheckInterval` command-line flag.

## static_configs

A static config allows specifying a list of targets and a common label set for them.

Configuration example:

```yaml
scrape_configs:
- job_name: static
  static_configs:

    # targets must contain a list of `host:port` targets to scrape.
    # The `http://host:port/metrics` endpoint is scraped per each configured traget then.
    # The `http` scheme can be changed to `https` by setting it via `scheme` field at `scrape_config` level.
    # The `/metrics` path can be changed to arbitrary path via `metrics_path` field at `scrape_config` level.
    # See https://docs.victoriametrics.com/sd_configs.html#scrape_configs .
    #
    # Alternatively the scheme and path can be changed via `relabel_configs` section at `scrape_config` level.
    # See https://docs.victoriametrics.com/vmagent.html#relabeling .
    #
    # It is also possible specifying full target urls here, e.g. "http://host:port/metrics/path?query_args"
  - targets:
    - "vmsingle1:8428"
    - "vmsingleN:8428"

    # labels is an optional labels to add to all the targets.
    # labels:
    #   <labelname1>: "<labelvalue1>"
    #   ...
    #   <labelnameN>: "<labelvalueN>"
```

## yandexcloud_sd_configs

[Yandex Cloud](https://cloud.yandex.com/en/) SD configurations allow retrieving scrape targets from accessible folders.

Configuration example:

```yaml
scrape_configs:
- job_name: yandexcloud
  yandexcloud_sd_configs:
    # service is a mandatory option for yandexcloud service discovery
    # currently only "compute" service is supported
  - service: compute

    # api_endpoint is an optional API endpoint for service discovery
    # The https://api.cloud.yandex.net endpoint is used by default.
    # api_endpoint: "https://api.cloud.yandex.net"

    # yandex_passport_oauth_token is an optional OAuth token
    # for querying yandexcloud API. See https://cloud.yandex.com/en-ru/docs/iam/concepts/authorization/oauth-token
    # yandex_passport_oauth_token: "..."

    # tls_config is an optional tls config.
    # See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#tls_config
    # tls_config:
    #   ...
```

Yandex Cloud SD support both user [OAuth token](https://cloud.yandex.com/en-ru/docs/iam/concepts/authorization/oauth-token)
and [instance service account](https://cloud.yandex.com/en-ru/docs/compute/operations/vm-connect/auth-inside-vm) if `yandex_passport_oauth_token` is omitted:

```yaml
scrape_configs:
- job_name: YC_with_oauth
  yandexcloud_sd_configs:
  - service: compute
    yandex_passport_oauth_token: "AQAAAAAsfasah<...>7E10SaotuL0"
  relabel_configs:
  - source_labels: [__meta_yandexcloud_instance_public_ip_0]
    target_label: __address__
    replacement: "$1:9100"

- job_name: YC_with_Instance_service_account
  yandexcloud_sd_configs:
  - service: compute
  relabel_configs:
  - source_labels: [__meta_yandexcloud_instance_private_ip_0]
    target_label: __address__
    replacement: "$1:9100"
```

Each discovered target has an [`__address__`](https://docs.victoriametrics.com/relabeling.html#how-to-modify-scrape-urls-in-targets) label set
to the FQDN of the discovered instance.

The following meta labels are available on discovered targets during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling):

* `__meta_yandexcloud_instance_name`: the name of instance
* `__meta_yandexcloud_instance_id`: the id of instance
* `__meta_yandexcloud_instance_fqdn`: generated FQDN for instance
* `__meta_yandexcloud_instance_status`: the status of instance
* `__meta_yandexcloud_instance_platform_id`: instance platform ID (i.e. "standard-v3")
* `__meta_yandexcloud_instance_resources_cores`: instance vCPU cores
* `__meta_yandexcloud_instance_resources_core_fraction`: instance core fraction
* `__meta_yandexcloud_instance_resources_memory`: instance memory
* `__meta_yandexcloud_folder_id`: instance folder ID
* `__meta_yandexcloud_instance_label_<label name>`: each label from instance
* `__meta_yandexcloud_instance_private_ip_<interface index>`: private IP of <interface index> network interface
* `__meta_yandexcloud_instance_public_ip_<interface index>`: public (NAT) IP of <interface index> network interface
* `__meta_yandexcloud_instance_private_dns_<record number>`: if configured DNS records for private IP
* `__meta_yandexcloud_instance_public_dns_<record number>`: if configured DNS records for public IP

The list of discovered Yandex Cloud targets is refreshed at the interval, which can be configured via `-promscrape.yandexcloudSDCheckInterval` command-line flag.

## scrape_configs

The `scrape_configs` section at file pointed by `-promscrape.config` command-line flag can contain [supported service discovery options](#supported-service-discovery-configs).
Additionally, it can contain the following options:

```yaml
scrape_configs:
  # job_name must contain value for `job` label, which is added
  # to all the metrics collected from the configured and discovered scrape targets.
  # See https://prometheus.io/docs/concepts/jobs_instances/ .
- job_name: "..."

  # scrape_interval is an optional interval to scrape targets.
  # By default the scrape_interval sepcified in `global` section is used.
  # See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#configuration-file
  # If `global` section doesn't contain the `scrape_interval` option,
  # then one minute interval is used.
  # Example values:
  # - "30s" - 30 seconds
  # - "2m" - 2 minutes
  # The scrape_interval can be set on a per-target basis by specifying `__scrape_interval__`
  # label during target relabeling phase.
  # See https://docs.victoriametrics.com/vmagent.html#relabeling
  # scrape_interval: <duration>

  # scrape_timeout is an optional timeout when scraping the targets.
  # By default the scrape_timeout specified in `global` section is used.
  # See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#configuration-file
  # If `global` section doesn't contain the `scrape_timeout` option,
  # then 10 seconds interval is used.
  # Example values:
  # - "30s" - 30 seconds
  # - "2m" - 2 minutes
  # The `scrape_timeout` cannot exceed the `scrape_interval`.
  # The scrape_timeout can be set on a per-target basis by specifying `__scrape_timeout__`
  # label during target relabeling phase.
  # See https://docs.victoriametrics.com/vmagent.html#relabeling
  # scrape_timeout: <duration>

  # metrics_path is the path to fetch metrics from targets.
  # By default metrics are fetched from "/metrics" path.
  # metrics_path: "..."

  # honor_labels controls how to handle conflicts between labels that are
  # already present in scraped data and labels that would be attached
  # server-side ("job" and "instance" labels, manually configured target
  # labels, labels generated by service discovery, etc.
  #
  # If honor_labels is set to "true", label conflicts are resolved by keeping label
  # values from the scraped data and ignoring the conflicting server-side labels.
  #
  # If honor_labels is set to "false", label conflicts are resolved by renaming
  # conflicting labels in the scraped data to "exported_<original-label>" (for
  # example "exported_instance", "exported_job") and then attaching server-side
  # labels.
  #
  # Setting honor_labels to "true" is useful for use cases such as federation and
  # scraping the Pushgateway, where all labels specified in the target should be
  # preserved.
  #
  # By default honor_labels is set to false for security and consistency reasons.
  # honor_labels: <boolean>

  # honor_timestamps controls whether to respect the timestamps present in scraped data.
  #
  # If honor_timestamps is set to "true", the timestamps of the metrics exposed
  # by the target will be used.
  #
  # If honor_timestamps is set to "false", the timestamps of the metrics exposed
  # by the target will be ignored.
  #
  # By default honor_timestamps is set to true.
  # honor_timestamps: <boolean>

  # scheme configures the protocol scheme used for requests.
  # Supported values: http and https.
  # By default http is used.
  # scheme: "..."

  # Optional query arg parameters to add to scrape url.
  # params:
  #   "param_name1": ["value1", ..., "valueN"]
  #   ...
  #   "param_nameM": ["valueM1", ..., "valueMN"]

  # relabel_configs is an optional relabeling configurations
  # for the specified and discovered scrape targets.
  # See https://docs.victoriametrics.com/vmagent.html#relabeling
  # relabel_configs:
  # - <relabel_config> ...

  # metric_relabel_configs is an optional relabeling configs
  # for the collected metrics from active scrape targets.
  # See https://docs.victoriametrics.com/vmagent.html#relabeling
  # metric_relabel_configs:
  # - <relabel_config> ...

  # sample_limit is an optional per-scrape limit on number
  # of scraped samples that will be accepted.
  # If more than this number of samples are present after metric relabeling
  # the entire scrape will be treated as failed.
  # By default the limit is disabled.
  # sample_limit: <int>

  # disable_compression allows disabling HTTP compression for responses received from scrape targets.
  # By default scrape targets are queried with `Accept-Encoding: gzip` http request header,
  # so targets could send compressed responses in order to save network bandwidth.
  # See https://docs.victoriametrics.com/vmagent.html#scrape_config-enhancements
  # disable_compression: <boolean>

  # disable_keepalive allows disabling HTTP keep-alive when scraping targets.
  # By default HTTP keep-alive is enabled, so TCP connections to scrape targets
  # could be re-used.
  # See https://docs.victoriametrics.com/vmagent.html#scrape_config-enhancements
  # disable_keepalive: <boolean>

  # stream_parse allows enabling stream parsing mode when scraping targets.
  # By default stream parsing mode is disabled for targets which return up to a few thosands samples.
  # See https://docs.victoriametrics.com/vmagent.html#stream-parsing-mode .
  # The stream_parse can be set on a per-target basis by specifying `__stream_parse__`
  # label during target relabeling phase.
  # See https://docs.victoriametrics.com/vmagent.html#relabeling
  # stream_parse: <boolean>

  # scrape_align_interval allows aligning scrapes to the given interval.
  # Example values:
  # - "5m" - align scrapes to every 5 minutes.
  # - "1h" - align scrapes to every hour.
  # See https://docs.victoriametrics.com/vmagent.html#scrape_config-enhancements
  # scrape_align_interval: <duration>

  # scrape_offset allows specifying the exact offset for scrapes.
  # Example values:
  # - "5m" - align scrapes to every 5 minutes.
  # - "1h" - align scrapes to every hour.
  # See https://docs.victoriametrics.com/vmagent.html#scrape_config-enhancements
  # scrape_offset: <duration>

  # series_limit is an optional limit on the number of unique time series
  # a single target can expose during all the scrapes on the time window of 24h.
  # By default, there is no limit on the number of exposed series.
  # See https://docs.victoriametrics.com/vmagent.html#cardinality-limiter .
  # The series_limit can be set on a per-target basis by specifying `__series_limit__`
  # label during target relabeling phase.
  # See https://docs.victoriametrics.com/vmagent.html#relabeling
  # series_limit: ...

  # no_stale_markers allows disabling staleness tracking.
  # By default, staleness tracking is enabled for all the discovered scrape targets.
  # See https://docs.victoriametrics.com/vmagent.html#prometheus-staleness-markers
  # no_stale_markers: <boolean>

  # Additional HTTP client options for target scraping can be specified here.
  # See https://docs.victoriametrics.com/sd_configs.html#http-api-client-options
```

## HTTP API client options

The following additional options can be specified in the [scrape_configs](#scrape_configs)
and in the majority of [supported service discovery configs](#supported-service-discovery-configs):

```yaml
    # authorization is an optional `Authorization` header configuration.
    # authorization:
    #   type: "..."  # default: Bearer
    #   credentials: "..."
    #   credentials_file: "..."

    # basic_auth is an optional HTTP basic authentication configuration.
    # basic_auth:
    #   username: "..."
    #   password: "..."
    #   password_file: "..."

    # bearer_token is an optional Bearer token to send in every HTTP API request during service discovery.
    # bearer_token: "..."

    # bearer_token_file is an optional path to file with Bearer token to send
    # in every HTTP API request during service discovery.
    # The file is re-read every second, so its contents can be updated without the need to restart the service discovery.
    # bearer_token_file: "..."

    # oauth2 is an optional OAuth 2.0 configuration.
    # See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#oauth2
    # oauth2:
    #   ...

    # tls_config is an optional TLS configuration.
    # See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#tls_config
    # tls_config:
    #   ...

    # headers is an optional HTTP headers to pass with each request.
    # headers:
    # - "HeaderName1: HeaderValue"
    # - "HeaderNameN: HeaderValueN"

    # proxy_url is an optional URL for the proxy to use for HTTP API queries during service discovery.
    # proxy_url: "..."

    # proxy_authorization is an optional `Authorization` header config for the proxy_url.
    # proxy_authorization:
    #   type: "..."  # default: Bearer
    #   credentials: "..."
    #   credentials_file: "..."

    # proxy_basic_auth is an optional HTTP basic authentication configuration for the proxy_url.
    # proxy_basic_auth:
    #   username: "..."
    #   password: "..."
    #   password_file: "..."

    # proxy_bearer_token is an optional Bearer token to send to proxy_url.
    # proxy_bearer_token: "..."

    # proxy_bearer_token_file is an optional path to file with Bearer token to send to proxy_url.
    # The file is re-read every second, so its contents can be updated without the need to restart the service discovery.
    # proxy_bearer_token_file: "..."

    # proxy_oauth2 is an optional OAuth 2.0 configuration for the proxy_url.
    # See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#oauth2
    # proxy_oauth2:
    #   ...

    # proxy_tls_config is an optional TLS configuration for the proxy_url.
    # See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#tls_config
    # proxy_tls_config:
    #   ...

    # proxy_headers is an optional HTTP headers to pass to the proxy_url.
    # proxy_headers:
    # - "HeaderName1: HeaderValue"
    # - "HeaderNameN: HeaderValueN"
```