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Part 7: Use VSAE fragments to add custom Groups to your MP

This is part 7 in a series of posts described here:

In our next example fragment – we will create custom groups and add them to our MP.

Groups are a critical part of any management pack.  We will use them for overrides, to scope monitoring views, and to scope subscriptions.


I like to consider adding one or more of two different types groups to most of my custom application MP’s, depending on how you use SCOM.

First – a group of all instances of my custom class. 

I will use this for overrides, and subscriptions, where needed.

Second – a group of all Windows Computer objects that contain an instance of my custom class…. and the respective Health Service Watcher object related to each Computer.

I will use this to scope console views so I can expose more monitoring data about the computers running my app – to app owners.  It can also be used for subscriptions and overrides, since these computers host (and therefore contain) my class.  We want the Health Service Watcher objects when I need to allow app owners know when their computers are down – so they can see “Heartbeat” and “Computer Down” alerts.


I have created fragments which add groups independently, so you can pick and choose.  Don’t just add them all for every MP you make, because if you are a large enterprise, you might end up with too many groups (I’m talking >1000 here), which can cause SCOM to get overloaded.


Step 1:  Download and extract the sample MP fragments.  These are available here:

I will update these often as I enhance and add new ones, so check back often for new versions.

Step 2:  Open your newly created MP solution, and open Solution Explorer.  This solution was created in Part 1, and the class was created in Part 2.

Step 3:  Create a folder and add the fragment to it.

Create a folder called “Groups” in your MP, if you don’t already have this folder.



Right click Groups, and Add > Existing item.

Find the fragment named “Class.Group.ClassInstances.mpx” and add it.

Select Class.Group.ClassInstances.mpx in solution explorer to display the XML.


Step 4:  Find and Replace

Replace ##CompanyID## with our company ID which is “Fab

Replace ##AppName## with our App ID, which is “DemoApp

Replace ##ClassID## with the custom class we created in Part 2 of the series.  This was “Fab.DemoApp.Server.Class” from our previous class fragment.


That took all of 2 minutes.  Take another few minutes to review the XML we have in this fragment.  It is a simple class definition for our group, a discovery to populate the group, along with DisplayStrings for displaynames for each.


Step 5:  Build the MP.   BUILD > Build Solution.


Error    92    Cannot resolve identifier MSIL!Microsoft.SystemCenter.InstanceGroup in the context of management pack Fab.DemoApp. Unknown alias: MSIL    C:\Program Files (x86)\MSBuild\Microsoft\VSAC\Microsoft.SystemCenter.OperationsManager.targets    255    6    Fab.DemoApp


This is because the group fragment needs a reference to the Instance Group Library.

In Solution Explorer – add a reference by right clicking “References” and choose “Add Reference”



VSAE came with a bunch of common reference files – so browse to C:\Program Files (x86)\System Center Visual Studio Authoring Extensions\References folder.  Pick the version of SCOM you want to be able to import this into, and select the “”.

Highlight this MP in Solution Explorer under References, and in the properties window you will see the default Alias used, which you can change if necessary.  I used the default VSAE reference aliases in all my fragments.



Now Save All, then BUILD again.





Step 6:  Import or Deploy the management pack.




Step 7:  Test the MP.

Open the Authoring pane of the console – and select “Groups”

Find your new DemoApp Instance group:



Right click and View Group Members:

(Note:  This may take a few minutes in your environment for Group Population to run, and generate new config)



At this point – you can repeat these same steps for some other group fragments:









  1. Adam Hulek

    Hi Kevin,

    Your MP fragments are great and makes our life easier 🙂
    But I`m struggling with a problem when creating a group of Windows Computers that contain another class. That is based on Class.Group.WindowsComputers.mpx
    I think I do everything by the book. MP Build is successful, I have tried to seal MP. Import works as expected but when a group calculation runs I hit this error:
    EventID 31415:
    The group membership calculation is exiting on an unrecoverable exception: System.Xml.Schema.XmlSchemaValidationException: A schema error occurred.

    And this is full xml of the MP I`m importing.
    What am I doing wrong 🙂 ????












    CS AD Computers Group

    CS AD Computers Group Discovery
    This discovery rule populates a group of Windows Computer Objects that contain a Windows Server Domain Controller instance

  2. HungryDad

    After adding the fragment Class.Group.WindowsComputer i get many Warnings in event viewer EventID 10457 , Source=Health Service Modules :

    “Échec du prochain appel
    Espace de noms \\.\ROOT\CIMV2
    Requête SELECT Timestamp_PerfTime,Frequency_PerfTime,TimeStamp_Sys100NS,Name,HandleCount FROM Win32_PerfRawData_PerfProc_Process WHERE IDProcess=4632

    HRESULT 0x80041017 Détails Demande non valide

    Au moins un flux de travail est affecté.

    Nom du flux de travail : Microsoft.SystemCenter.NTService.CollectHandleCount
    Nom de l’instance : Data Access Service –
    ID de l’instance : {35791C12-E9FF-E343-8707-B40470C20E2C} ”

    We are running on Windows Server 2019 (version 1809, 17763.973)!

    Could this be related to this version of Windows Server?

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