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Documentation Grafana Agent Flow mode Reference Components reference discovery.marathon

discovery.marathon

discovery.marathon allows you to retrieve scrape targets from Marathon’s Service API.

Usage

river Copy

discovery.marathon "LABEL" {
  servers = [MARATHON_SERVER1, MARATHON_SERVER2...]
}

Arguments

The following arguments are supported:

You can provide one of the following arguments for authentication:

• auth_token argument.
• auth_token_file argument.
• basic_auth block.
• authorization block.
• oauth2 block.

Blocks

The following blocks are supported inside the definition of discovery.marathon:

The > symbol indicates deeper levels of nesting. For example, oauth2 > tls_config refers to a tls_config block defined inside an oauth2 block.

basic_auth block

password and password_file are mutually exclusive, and only one can be provided inside a basic_auth block.

authorization block

credential and credentials_file are mutually exclusive, and only one can be provided inside an authorization block.

oauth2 block

client_secret and client_secret_file are mutually exclusive, and only one can be provided inside an oauth2 block.

The oauth2 block may also contain a separate tls_config sub-block.

tls_config block

The following pairs of arguments are mutually exclusive and can’t both be set simultaneously:

• ca_pem and ca_file
• cert_pem and cert_file
• key_pem and key_file

When configuring client authentication, both the client certificate (using cert_pem or cert_file) and the client key (using key_pem or key_file) must be provided.

When min_version is not provided, the minimum acceptable TLS version is inherited from Go’s default minimum version, TLS 1.2. If min_version is provided, it must be set to one of the following strings:

• "TLS10" (TLS 1.0)
• "TLS11" (TLS 1.1)
• "TLS12" (TLS 1.2)
• "TLS13" (TLS 1.3)

Exported fields

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

Each target includes the following labels:

• __meta_marathon_app: the name of the app (with slashes replaced by dashes).
• __meta_marathon_image: the name of the Docker image used (if available).
• __meta_marathon_task: the ID of the Mesos task.
• __meta_marathon_app_label_<labelname>: any Marathon labels attached to the app.
• __meta_marathon_port_definition_label_<labelname>: the port definition labels.
• __meta_marathon_port_mapping_label_<labelname>: the port mapping labels.
• __meta_marathon_port_index: the port index number (e.g. 1 for PORT1).

Component health

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

Debug information

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

Debug metrics

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

Example

This example discovers targets from a Marathon server:

river Copy

discovery.marathon "example" {
  servers = ["localhost:8500"]
}

prometheus.scrape "demo" {
  targets    = discovery.marathon.example.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.