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This is documentation for the next version of Alloy. For the latest stable release, go to the latest version.

Open source

otelcol.connector.host_info

otel.connector.host_info accepts span data from other otelcol components and generates usage metrics.

Usage

alloy
otelcol.connector.host_info "LABEL" {
  output {
    metrics = [...]
  }
}

Arguments

otelcol.connector.host_info supports the following arguments:

NameTypeDescriptionDefaultRequired
host_identifierslist(string)Ordered list of resource attributes used to identify unique hosts.["host.id"]no
metrics_flush_intervaldurationHow often to flush generated metrics."60s"no

Blocks

The following blocks are supported inside the definition of otelcol.connector.host_info:

HierarchyBlockDescriptionRequired
outputoutputConfigures where to send received telemetry data.yes
debug_metricsdebug_metricsConfigures the metrics that this component generates to monitor its state.no

output block

The output block configures a set of components to forward resulting telemetry data to.

The following arguments are supported:

NameTypeDescriptionDefaultRequired
metricslist(otelcol.Consumer)List of consumers to send metrics to.[]no

You must specify the output block, but all its arguments are optional. By default, telemetry data is dropped. Configure the metrics argument accordingly to send telemetry data to other components.

debug_metrics block

The debug_metrics block configures the metrics that this component generates to monitor its state.

The following arguments are supported:

NameTypeDescriptionDefaultRequired
disable_high_cardinality_metricsbooleanWhether to disable certain high cardinality metrics.trueno
levelstringControls the level of detail for metrics emitted by the wrapped collector."detailed"no

disable_high_cardinality_metrics is the Grafana Alloy equivalent to the telemetry.disableHighCardinalityMetrics feature gate in the OpenTelemetry Collector. It removes attributes that could cause high cardinality metrics. For example, attributes with IP addresses and port numbers in metrics about HTTP and gRPC connections are removed.

Note

If configured, disable_high_cardinality_metrics only applies to otelcol.exporter.* and otelcol.receiver.* components.

level is the Alloy equivalent to the telemetry.metrics.level feature gate in the OpenTelemetry Collector. Possible values are "none", "basic", "normal" and "detailed".

Exported fields

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

NameTypeDescription
inputotelcol.ConsumerA value that other components can use to send telemetry data to.

input accepts otelcol.Consumer traces telemetry data. It does not accept metrics and logs.

Example

The example below accepts traces, adds the host.id resource attribute via the otelcol.processor.resourcedetection component, creates usage metrics from these traces, and writes the metrics to Mimir.

alloy
otelcol.receiver.otlp "otlp" {
  http {}
  grpc {}

  output {
    traces = [otelcol.processor.resourcedetection.otlp_resources.input]
  }
}

otelcol.processor.resourcedetection "otlp_resources" {
  detectors = ["system"]
  system {
    hostname_sources = [ "os" ]
    resource_attributes {
      host.id {
        enabled = true
      }
    }
  }
  output {
    traces = [otelcol.connector.host_info.default.input]
  }
}

otelcol.connector.host_info "default" {
  output {
    metrics = [otelcol.exporter.prometheus.otlp_metrics.input]
  }
}

otelcol.exporter.prometheus "otlp_metrics" {
  forward_to = [prometheus.remote_write.default.receiver]
}

prometheus.remote_write "default" {
  endpoint {
    url = "https://prometheus-xxx.grafana.net/api/prom/push"
    basic_auth {
      username = sys.env("PROMETHEUS_USERNAME")
      password = sys.env("GRAFANA_CLOUD_API_KEY")
    }
  }
}

Compatible components

otelcol.connector.host_info can accept arguments from the following components:

otelcol.connector.host_info has exports that can be consumed by the following components:

Note

Connecting some components may not be sensible or components may require further configuration to make the connection work correctly. Refer to the linked documentation for more details.