There is no direct equivalent of the Alerts functionality in QlikView.
One approach is to calculate whether an alert is required in the load script and then use the Qlik Notification Connector to send the alert.
This connector is one of the free ones included with Qlik Web Connectors, more detail can be found here:
Another approach is to use NPrinting, which can trigger reports to be sent on criteria being met - but there is an extra licence cost for this solution.
Hope that helps,