Sometimes it is not desirable for the alerts to process the data for you.  In this case, we provide filters, whose actions are executed every time a new piece of data is received for a given subscription.  The format of a filter is simple:

<filter farm="My Farm" cluster="My Cluster" node="My Node" param="some param">
  <action1 />
  <action2 />
</filter>

The above example will execute actions 1 and 2 anytime data matching "My Farm/My Cluster/My Node/some param" is received.