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This page describes what to do in case of an Icinga alert. For more information you could search the govuk-puppet repo for the source of the alert
Last updated: 17 Sep 2020

Pingdom check for homepage failing

Pingdom monitors externally (from ~10 locations in Europe and America) that it can connect to https://www.gov.uk. If this fails it could indicate that DNS for www.gov.uk is not working, our CDN has failed or GOV.UK and all the static mirrors are inaccessible, which would qualify as a major incident.

If you can confirm that GOV.UK is globally inaccessible, this is cause to first alert other people who may be able to help, then start troubleshooting to see if you can narrow down the failure.