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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: 22 Apr 2021

Pingdom search check

If Pingdom can’t retrieve the search results page, it means that while GOV.UK may be available, it is not possible to retrieve dynamic content. Assuming that the homepage check has not failed, the CDN is probably OK. It is possible for our main provider (AWS) to be down and for us to serve static content from a secondary mirror at a second supplier (AWS/GCP).

This is not as critical a problem as you might assume, because a large amount of traffic from external searches goes directly to static content and can be served from the mirror. Debug as normal by walking through the stack backwards from the user’s perspective to find out where the failure is.