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[Eric Chen <1908432@xxxxxxxxxxxxxxxxxx>]

** Tags added: bseng-484

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https://bugs.launchpad.net/bugs/1908432

Title:
  Nagios unit stops checks and doesn't alert when disk goes read-only

Status in Nagios Charm:
  New

Bug description:
  We had an incident where the root disk of the nagios VM on an infra
  node was marked read-only due to I/O Errors.

  No checks ran after the i/o errors started and no alerts were sent to
  pagerduty which was enabled on the site.

  While the remote thruk-external-agent alerted to content issues on the
  nagios/thruk unit, it would be nice if a site with pagerduty enabled
  could have a watchdog process that alerts out if checks are not
  running or if the filesystem is in read-only mode.

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