integ/monitoring/collectd-extensions/src/example.conf

<Plugin "threshold">
  <Plugin "example">
    <Type "percent">
      Instance "used"
      Persist true
      PersistOK true
      WarningMax 49.00
      FailureMax 74.00
      Hits 1
      Invert false
    </Type>
  </Plugin>
</Plugin>