How to Create an Override for a Discovery

System Center

Updated: May 22, 2009

Applies To: Operations Manager 2007 R2, Operations Manager 2007 SP1, System Center Operations Manager 2007

You can create an override for a property or configuration parameter for a discovery. A property override changes the default value of a discovery property, and a configuration override changes the default value of a custom configuration setting for a discovery. If you want to create an override for a discovery, use the ManagementPackDiscoveryPropertyOverride or ManagementPackDiscoveryConfigurationOverride class. These classes are derived from the ManagementPackDiscoveryOverride class.

Only the Enabled property can be overridden for discoveries. To figure out which parameters can be overridden, you must look at the definition of the discovery in the Management Pack that defines the discovery. All the parameters that can be overridden are defined in the OverrideableParameters element of the discovery. You can also call the GetOverrideableParameters method to get the list of parameters programmatically.

The following example creates an override for the Enabled property of a discovery.

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.EnterpriseManagement
Imports Microsoft.EnterpriseManagement.Administration
Imports Microsoft.EnterpriseManagement.Common
Imports Microsoft.EnterpriseManagement.Configuration
Imports Microsoft.EnterpriseManagement.Monitoring


Namespace SDKSamples
    Class Program
        Public Overloads Shared Function Main(ByVal args() As String) As Integer

            Dim mg As ManagementGroup
            Dim mp As ManagementPack
            Dim monitoringClass As MonitoringClass
            Dim classCriteria As MonitoringClassCriteria
            Dim discoveryCriteria As MonitoringDiscoveryCriteria
            Dim discovery As MonitoringDiscovery
            Dim discoveryOverride As ManagementPackDiscoveryPropertyOverride

            mg = New ManagementGroup("localhost")

            mp = mg.GetManagementPacks("OverrideTestMP")(0)

            classCriteria = New MonitoringClassCriteria("Name='Microsoft.SQLServer.2005.DBEngine'")

            monitoringClass = mg.GetMonitoringClasses(classCriteria)(0)

            discoveryCriteria = New MonitoringDiscoveryCriteria( _
                "Name='Microsoft.SQLServer.2005.DatabaseDiscoveryRule'")

            discovery = mg.GetMonitoringDiscoveries(discoveryCriteria)(0)

            discoveryOverride = New ManagementPackDiscoveryPropertyOverride(mp, _
                "SampleDiscoveryOverride")

            discoveryOverride.Discovery = discovery
            discoveryOverride.Property = ManagementPackWorkflowProperty.Enabled
            discoveryOverride.Value = "false"
            discoveryOverride.Context = monitoringClass
            discoveryOverride.DisplayName = "SampleDiscoveryOverride"

            mp.Verify()

            ' Save the changes into the management pack.
            mp.AcceptChanges()

        End Function
    End Class
End Namespace

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