...

'cipSecGlobalActiveTunnels' => {
  'oid' => 'cipSecGlobalActiveTunnels',
  'title' => 'Global Active Tunnels',
  'alert' => {
    'test' => '$r == 0',
    'event' => 'No tunnels present',
    'level' => 'Critical'
  }
}       

More Advanced Alerts

Alerts can also be created in the 'alerts' section of the model (if the model does not have that section it can be added at the lowest level of the model, e.g. along side '-common=' and 'system'.  Alerts created in this section have the advantage of being able to use values from a whole section of data to determine if the alert should be triggered or not.  A concrete example always makes things more clear.

...