Registry-based discovery does not show non key property value

Question

Hi,
Discovered Inventory shows instances of my new class correctly, but the non key property ServerType appears but has no value. I have confirmed each instance does have the registry value populated. What can I do?
I see the following Event 31876 on one of the clients:
Data item returned no information for parameter '$Data/Values/ServerType$'
 This usually indicates that the query is incorrect.
Detailed Background:
My custom application is made of 8 different computer roles.
HKLM\SOFTWARE\Vendor\Appname exists = true indicates an instance of my app.
HKLM\SOFTWARE\Vendor\Appname\ServerType indicates the actual server role.
I want an initial hosted class (VendorServer) based on Microsoft.Windows.Computer base class to contain all server roles.
Then I will create 8 hosted classes (VendorServerRoleA, VendorServerRoleB, etc) for each server role based on the initial hosted class (VendorServer).
My discovery for VendorServer class created instances, and I see ServerType as a property in Discovered Inventory, but it is blank for all instances.  Should I expect to see ServerType populated where I mapped it as follows:
Name =
$MPElement[Name="MPName.VendorServer"]/ServerType$
Value =
$Data/Values/ServerType$
Does $MPElement need to reference the discovery object instead of the class object (which it currently does)?
I started with a blank MP and then create the new VendorServer class based on Microsoft.Windows.ComputerRole and added the new Property, ServerType as a non key property.
The discovery targets Microsoft.Windows.Computers.  Is it ok to have the discover target one class and the VendorServer class have a different base class?
My build event was simply if HKLM\SOFTWARE\Vendor\Appname exists
I am hesitant to proceed to create my VendorServerRoleA class based on HKLM\SOFTWARE\Vendor\Appname\ServerType=AAA until what I have built so far works completely, unless it is not expected to do so.
A related question.  Once I have classes for each server role, can I target monitorA at multiple classes, or do I need to create a new monitor for each class?
This authoring learning curve is so steep as I am sure many of you already know.  MUCH thanks for help...

Answer 1

<ManagementPack ContentReadable="true" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <Manifest>
    <Identity>
      <ID>Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack</ID>
      <Version>1.1.1.1</Version>
    </Identity>
    <Name>Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack</Name>
    <References>
      <Reference Alias="SC">
        <ID>Microsoft.SystemCenter.Library</ID>
        <Version>6.0.6278.0</Version>
        <PublicKeyToken>31bf3856ad364e35</PublicKeyToken>
      </Reference>
      <Reference Alias="Windows">
        <ID>Microsoft.Windows.Library</ID>
        <Version>6.0.6278.0</Version>
        <PublicKeyToken>31bf3856ad364e35</PublicKeyToken>
      </Reference>
      <Reference Alias="Health">
        <ID>System.Health.Library</ID>
        <Version>6.0.6278.0</Version>
        <PublicKeyToken>31bf3856ad364e35</PublicKeyToken>
      </Reference>
      <Reference Alias="System">
        <ID>System.Library</ID>
        <Version>6.0.6278.0</Version>
        <PublicKeyToken>31bf3856ad364e35</PublicKeyToken>
      </Reference>
    </References>
  </Manifest>
  <TypeDefinitions>
    <EntityTypes>
      <ClassTypes>
        <ClassType ID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServer" Accessibility="Internal" Abstract="false" Base="Windows!Microsoft.Windows.ComputerRole" Hosted="true" Singleton="false">
          <Property ID="ServerType" Type="string" Key="false" CaseSensitive="false" Length="256" MinLength="0" />
        </ClassType>
        <ClassType ID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServerCDC" Accessibility="Internal" Abstract="false" Base="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServer" Hosted="true"
Singleton="false" />
      </ClassTypes>
    </EntityTypes>
  </TypeDefinitions>
  <Monitoring>
    <Discoveries>
      <Discovery ID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.DiscoverIFSSubsystemServer" Enabled="true" Target="Windows!Microsoft.Windows.Computer" ConfirmDelivery="false" Remotable="true" Priority="Normal">
        <Category>Discovery</Category>
        <DiscoveryTypes>
          <DiscoveryClass TypeID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServer" />
        </DiscoveryTypes>
        <DataSource ID="DS" TypeID="Windows!Microsoft.Windows.FilteredRegistryDiscoveryProvider">
          <ComputerName>$Target/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</ComputerName>
          <RegistryAttributeDefinitions>
            <RegistryAttributeDefinition>
              <AttributeName>KeyExists</AttributeName>
              <Path>SOFTWARE\Thales\IFSBOSystem</Path>
              <PathType>0</PathType>
              <AttributeType>0</AttributeType>
            </RegistryAttributeDefinition>
          </RegistryAttributeDefinitions>
          <Frequency>300</Frequency>
          <ClassId>$MPElement[Name="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServer"]$</ClassId>
          <InstanceSettings>
            <Settings>
              <Setting>
                <Name>$MPElement[Name="Windows!Microsoft.Windows.Computer"]/PrincipalName$</Name>
                <Value>$Target/Property[Type="Windows!Microsoft.Windows.Computer"]/PrincipalName$</Value>
              </Setting>
              <Setting>
                <Name>$MPElement[Name="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServer"]/ServerType$</Name>
                <Value>$Data/Values/ServerType$</Value>
              </Setting>
              <Setting>
                <Name>$MPElement[Name="System!System.Entity"]/DisplayName$</Name>
                <Value>$Target/Property[Type="Windows!Microsoft.Windows.Computer"]/PrincipalName$</Value>
              </Setting>
            </Settings>
          </InstanceSettings>
          <Expression>
            <SimpleExpression>
              <ValueExpression>
                <XPathQuery Type="String">Values/KeyExists</XPathQuery>
              </ValueExpression>
              <Operator>Equal</Operator>
              <ValueExpression>
                <Value Type="String">true</Value>
              </ValueExpression>
            </SimpleExpression>
          </Expression>
        </DataSource>
      </Discovery>
      <Discovery ID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.DiscoverIFSSubsystemServerCDC" Enabled="true" Target="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServer" ConfirmDelivery="false" Remotable="true"
Priority="Normal">
        <Category>Discovery</Category>
        <DiscoveryTypes>
          <DiscoveryClass TypeID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServerCDC" />
        </DiscoveryTypes>
        <DataSource ID="DS" TypeID="Windows!Microsoft.Windows.FilteredRegistryDiscoveryProvider">
          <ComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</ComputerName>
          <RegistryAttributeDefinitions>
            <RegistryAttributeDefinition>
              <AttributeName>ServerTypeCDCTrue</AttributeName>
              <Path>SOFTWARE\Thales\IFSBOSystem\ServerType</Path>
              <PathType>1</PathType>
              <AttributeType>1</AttributeType>
            </RegistryAttributeDefinition>
          </RegistryAttributeDefinitions>
          <Frequency>300</Frequency>
          <ClassId>$MPElement[Name="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServerCDC"]$</ClassId>
          <InstanceSettings>
            <Settings>
              <Setting>
                <Name>$MPElement[Name="Windows!Microsoft.Windows.Computer"]/PrincipalName$</Name>
                <Value>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/PrincipalName$</Value>
              </Setting>
              <Setting>
                <Name>$MPElement[Name="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServer"]/ServerType$</Name>
                <Value>$Data/Values/ServerType$</Value>
              </Setting>
              <Setting>
                <Name>$MPElement[Name="System!System.Entity"]/DisplayName$</Name>
                <Value>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/PrincipalName$</Value>
              </Setting>
            </Settings>
          </InstanceSettings>
          <Expression>
            <SimpleExpression>
              <ValueExpression>
                <XPathQuery Type="String">Values/ServerTypeCDCTrue</XPathQuery>
              </ValueExpression>
              <Operator>Equal</Operator>
              <ValueExpression>
                <Value Type="String">CDC</Value>
              </ValueExpression>
            </SimpleExpression>
          </Expression>
        </DataSource>
      </Discovery>
    </Discoveries>
  </Monitoring>
  <LanguagePacks>
    <LanguagePack ID="ENU" IsDefault="true">
      <DisplayStrings>
        <DisplayString ElementID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack">
          <Name>Thales IFS Subsystem Discovery Monitoring Management Pack</Name>
          <Description>The purpose of this management pack is to monitor the health of various components of the Thales IFS subsystem servers including server types CDC CRD DC MWS PMS and SUP.</Description>
        </DisplayString>
        <DisplayString ElementID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.DiscoverIFSSubsystemServer">
          <Name>Discover IFS Subsystem Server</Name>
        </DisplayString>
        <DisplayString ElementID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.DiscoverIFSSubsystemServerCDC">
          <Name>IFS Subsystem CDC Server</Name>
        </DisplayString>
        <DisplayString ElementID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServer">
          <Name>IFS Subsystem Server</Name>
          <Description>CDC CRD DC MWS PMS SUP</Description>
        </DisplayString>
        <DisplayString ElementID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServer" SubElementID="ServerType">
          <Name>ServerType</Name>
          <Description>CDC CRD DC MWS PMS or SUP</Description>
        </DisplayString>
        <DisplayString ElementID="Thales.IFS.Subsystem.Discovery.Monitoring.ManagementPack.IFSSubsystemServerCDC">
          <Name>IFS Subsystem CDC Server</Name>
        </DisplayString>
      </DisplayStrings>
    </LanguagePack>
  </LanguagePacks>
</ManagementPack>