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GOV.UK Exporter

A Prometheus exporter that exposes the following metrics:

  • govuk_mirror_last_updated_time: A unix timestamp representing the Last-Modified header of the page referenced by the MIRROR_FRESHNESS_URL. Has the label backend for each backend override being used.

  • govuk_mirror_response_status_code: An HTTP status code representing the response status of the page referenced by the MIRROR_AVAILABILITY_URL. Has the label backend for each backend override being used.

Usage

Configuration is handled through environment variables as listed below:

  • MIRROR_FRESHNESS_URL: Specifies the URL to probe for Mirror freshness.
    • Example: MIRROR_FRESHNESS_URL=https://www.gov.uk/last-updated.txt
  • MIRROR_AVAILABILITY_URL: Specifies the URL to probe for Mirror availability.
    • Example: MIRROR_AVAILABILITY_URL=https://www.gov.uk
  • BACKENDS: A comma-separated list of backend overrides to collect metrics for.
    • Example: BACKENDS=mirrorS3,mirrorS3Replica,mirrorGCS
  • REFRESH_INTERVAL: The interval refresh the metrics. Defaults to 4h.
    • Example: REFRESH_INTERVAL=4h