Documentation Grafana Cloud Instrument and send data Grafana Alloy Reference Configuration blocks argument

argument block

argument is an optional configuration block used to specify parameterized input to a custom component. argument blocks must be given a label which determines the name of the argument.

The argument block may only be specified inside the definition of a declare block.

Example

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argument "ARGUMENT_NAME" {}

Arguments

The following arguments are supported:

By default, all module arguments are required. The optional argument can be used to mark the module argument as optional. When optional is true, the initial value for the module argument is specified by default.

Exported fields

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

If you use a custom component, you are responsible for determining the values for arguments. Other expressions within a custom component may use argument.ARGUMENT_NAME.value to retrieve the value you provide.

Example

This example creates a custom component that self-collects process metrics and forwards them to an argument specified by the user of the custom component:

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declare "self_collect" {
  argument "metrics_output" {
    optional = false
    comment  = "Where to send collected metrics."
  }

  prometheus.scrape "selfmonitor" {
    targets = [{
      __address__ = "127.0.0.1:12345",
    }]

    forward_to = [argument.metrics_output.value]
  }
}