Kevin Pham 0b997f63e3 MDL-71627 check: Add AV status, notification levels and more logging
- `notifylevel` will change what gets sent as part of the antivirus
  notification emails based on the scan type. For example if set on
  SCAN_RESULT_FOUND, it will not notify for any detections, if set to
  SCAN_RESULT_ERROR, it will notify for both detections and errors.
- `threshold` will determine how far the lookback is when displaying the
  status of the /reports/status (System Status) page. It will display as
  an ERROR state if there has been scanner issues within this certain
  threshold period
- As part of the above, scanner errors will now trigger a new event
  which will be logged as antivirus_scan_data_error or
  antivirus_scan_file_error. Due to the nature of it reading from the
  logs table, it only works currently for the "Standard logging"
  logstore.
2021-08-11 11:46:15 +10:00
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