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