Questions about creating a dynamic model for a firewall

Dear colleagues,

I am starting to work with dynamic modelling and found a couple of questions I can't find an answer for.

Basically, I want to extend a model for a firewall, gather a couple of additional OIDs and use a custom threshold from the UI.

This is where we currently are:

/*
* pp_fw_palo_alto.mdl - model file for Perimeter Protecion Palo Alto firewalls - IP domain(s)
* FIELD CERTIFICATION FILE
*
*/

interface PP_FW_PALO_ALTO_Status_Setting : ICF_PollingSetting
{
        refine stored DisplayName
                = "PP Palo Alto firewall Environment";
        refine stored RuleSet
                = "devstat/pp_fw_palo_alto_setting.asl";
        refine stored TargetClass = "ICIM_UnitaryComputerSystem";
}

interface PP_FW_PALO_ALTO_Setting : ICF_Setting {
        refine stored DisplayName
                = "PP Palo Alto firewall Settings";
        attribute int [0 .. 100] FwPaloAltopanSessionThreshold
                "Session table utilization percentage threshold (%)."
                = 50;
}

interface PP_FW_PALO_ALTO_Fault : ICIM_Instrumentation
{
        instrument SNMP {
                panMgmtPanoramaConnectedSNMP = "1.3.6.1.4.1.25461.2.1.2.4.1",
                panSessionUtilizationSNMP = "1.3.6.1.4.1.25461.2.1.2.3.1"
        };
        instrumented attribute string panMgmtPanoramaConnectedSNMP
                "Current Connection status to Panorama Server (connected, not-connected).";
        instrumented attribute int panSessionUtilizationSNMP
                "Current Session table usage (percentage).";
}

interface PP_FW_PALO_ALTO : UnitaryComputerSystem
{
        propagate attribute int panSessionUtilization
                "Current Session table usage (percentage)."
                = PP_FW_PALO_ALTO_Fault, InstrumentedBy, panSessionUtilizationSNMP;

        propagate attribute string panMgmtPanoramaConnected
                "Current Connection status to Panorama Server (connected, not-connected)."
                = PP_FW_PALO_ALTO_Fault, InstrumentedBy, panMgmtPanoramaConnectedSNMP;

        propagate attribute int [0 .. 100] FwPaloAltopanSessionThreshold
                "Session table utilization percentage threshold (%)."
                = PP_FW_PALO_ALTO_Setting, InstrumentedBy, FwPaloAltopanSessionThreshold

        event FwPaloAltoSessionUtilization
                "The current Session table usage is too high."
                = panSessionUtilization >= FwPaloAltopanSessionThreshold;
        export FwPaloAltoSessionUtilization;

        readonly string FwPaloAltoSessionUtilization_attributes()
        definition:
                return  "THRESHOLD      PCT     panSessionUtilization > FwPaloAltopanSessionThreshold";

        event FwPaloAltoPanoramaDisconnected
                "Firewall disconnected from Panorama Server."
                = panMgmtPanoramaConnected == "not-connected";
        export FwPaloAltoPanoramaDisconnected;
}

My questions, which I hope some of you have an answer for:

1) This mdl fails because FwPaloAltopanSessionThreshold is used directly and it is only declared inside the "interface PP_FW_PALO_ALTO_Setting : ICF_Setting" block, what else should I add inside the "interface PP_FW_PALO_ALTO : UnitaryComputerSystem" so that I can compare the instrumented value against the threshold configured in the UI? (Also, is there any way to see the errors and troubleshoot them? I can only see that the class does not get created unless I replace FwPaloAltopanSessionThreshold with a value such as 50)

2) I never get to see values for the instrumented attributes when I look for panSessionUtilization and panMgmtPanoramaConnected in the attribute list for a firewall of this class. The attributes do appear, but they are greyed out and have no value. What else could I be missing? In other case I get the events, but I can never see the actual value neither in the attributes nor in the "Details" tab of the event.

3) How can I query a OID defined as a table and iterate it in order to generate alerts?

4) Last but not least: is there any decent manual or training about these topics? We only have the dynamic modelling doc, with a few simple exampleas and both support and Professional Services won't help us with this, which is surprising when least...

Thanks a lot for your time and apologies for the long message.

Regards and greetings from Spain,

Hector