Table of contents
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

Icinga alerts

Nginx high conn writing -- upstream indicator Check

What is the ‘Nginx high conn writing – upstream indicator’ check?

Other useful information

  • Checks are specifically on the Nginx frontend boxes as that is the closest place to the problem we can monitor and avoids the false positives that checking the load balancers might give us.
  • The warning and alert levels for outages have been set low to be useful flags of what might be happening, but not so low that we get too many false positives.
  • Ideally we would monitor at the rack/unicorn level, which would give us more accurate information, but don’t currently have that ability, hence this check.
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