HAProxy metrics

The OpenTelemetry Collector, when configured with a Prometheus receiver, provides an integration with HAProxy to ingest metrics available from the HAProxy Stats page. The Collector fetches metrics from the configured path in the HAProxy configuration file and sends it to the Prometheus exporter. From there the metrics are received and processed by the Prometheus receiver and exported to Cloud Observability.

To complete the integration, you will:

Configure HAProxy to use the Prometheus exporter.
Configure the Collector to use the HAProxy endpoint as a scrape target for the Prometheus receiver.
Enable the integration by adding it to a pipeline.

Prerequisites

HAProxy v2.0 or later
You’ve configured the Collector to export metric data to Cloud Observability.

Configure HAProxy reporting

You need to configure HAProxy to use the Prometheus exporter.

In the frontend-stats section of your HAProxy configuration file, add the following directive: http-request use-service prometheus-exporter if { path /metrics }

frontend stats
  bind *:8404
  http-request use-service prometheus-exporter if { path /metrics }
  stats enable
  stats uri /
  stats refresh 10s

Read this blog post or more details about using HAProxy with the Prometheus exporter.

Configure the Collector receiver

In the Collector configuration file, configure the Prometheus receiver to use the HAProxy endpoint as a scrape target.

receivers:
  prometheus:
      config:
        scrape_configs:
          - job_name: 'haproxy'
            static_configs:
              - targets: ['haproxy:8404']

The OpenTelemetry repo’s readme provides additional details about Prometheus receiver configuration.

Enable the Collector receiver

Once the HAProxy receiver is configured, enable it by adding it to one or more pipelines as described in the Collector configuration documentation.

Validate metrics are reporting to Cloud Observability

You can validate that metrics are reporting to Cloud Observability on the Metrics details page in Settings.

In Cloud Observability, click Settings > Metric details.
Search for HAProxy metric names.
If needed, click on the metric to edit the description and how the units are displayed in Cloud Observability.

Create a dashboard for the metrics

Use the Cloud Observability Terraform Provider to create a dashboard for the metrics.

Additional resources

For a more complete example that’s ready to run, see the HAProxy integration in Cloud Observability OpenTelemetry Examples.