Table of contents
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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

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 thats 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 have been selected to fire early in the case of outages to be a useful flag of what might be happening, but not so low that we get too many false positives.
  • We should really monitor what’s going on at the rack/unicorn level which would give us more accurate information. We don’t currently have that ability, hence this check.
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