The advanced alert do not contain any fields you could use to trigger an action based on an event.
I suggest you create a thread in the NPM Feature Request section.
Alternatively there is an unsupported way of executing your own SQL Query in an advanced alert.
Since the EventType you are looking for is Volume Dissapeared (EventType=210), it should be straighforward to customize an alert assuming you are used to SQL syntax. I advise you to read the following thread to see how you could perform this:
I have the same issue but i would want to troubleshoot why the message appears when everything seems to be working. But i don't know where to start.
I am using SAM 6.0.0. These messages appears only when monitoring the filesysytem in unix. Any thoughts or solution?