Documentation

The Reporting services availability report proceses data in two pillars.

SQL Story: The group membership and the aggregated data is gathered. for group membership the group object has to be passed as an xml string to sql referred in details below.
Reporting Services Story: Availability is calculated at this stage

Reporting Services Story

Percent Uptime

=Code.FormatNumber("P2", Sum(Fields!UpTimeMilliseconds.Value) / Sum(Fields!IntervalDurationMilliseconds.Value))

UpTimeMilliSeconds

=Fields!InGreenStateMilliseconds.Value +
 IIF(Code.IsDownTime(Code.StateIntervalType.Yellow), 0, Fields!InYellowStateMilliseconds.Value) +
 IIF(Code.IsDownTime(Code.StateIntervalType.White), 0, Fields!InWhiteStateMilliseconds.Value) +
 IIF(Code.IsDownTime(Code.StateIntervalType.Gray), 0, Fields!InDisabledStateMilliseconds.Value) +
 IIF(Code.IsDownTime(Code.StateIntervalType.ServiceGray), 0, Fields!HealthServiceUnavailableMilliseconds.Value) +
 IIF(Code.IsDownTime(Code.StateIntervalType.Blue), 0, Fields!InPlannedMaintenanceMilliseconds.Value) +
 IIF(Code.IsDownTime(Code.StateIntervalType.Black), 0, Fields!InUnplannedMaintenanceMilliseconds.Value)

DowntimeMilliSeconds

=Fields!InRedStateMilliseconds.Value + 
 IIF(Code.IsDownTime(Code.StateIntervalType.Yellow), Fields!InYellowStateMilliseconds.Value, 0) + 
 IIF(Code.IsDownTime(Code.StateIntervalType.White), Fields!InWhiteStateMilliseconds.Value, 0) + 
 IIF(Code.IsDownTime(Code.StateIntervalType.Gray), Fields!InDisabledStateMilliseconds.Value, 0) + 
 IIF(Code.IsDownTime(Code.StateIntervalType.ServiceGray), Fields!HealthServiceUnavailableMilliseconds.Value, 0) +
 IIF(Code.IsDownTime(Code.StateIntervalType.Blue), Fields!InPlannedMaintenanceMilliseconds.Value, 0) + 
 IIF(Code.IsDownTime(Code.StateIntervalType.Black), Fields!InUnplannedMaintenanceMilliseconds.Value, 0)

Note: IIF (Clause, return when true, return when False)

Enum and Function used to calculate the above expresion.

Public Enum StateIntervalType
	Red = 0
	Green = 1
	Yellow = 2
	White = 3
	Gray = 4
	Black = 5
	Blue = 6
	ServiceGray = 7
End Enum

Public Function IsDownTime(time As StateIntervalType)
	Select Case time
		Case StateIntervalType.Red
			Return True

		Case StateIntervalType.Green
			Return False

		Case Else
			If IsNothing(DownTimeTable) Then
				DownTimeTable = New System.Collections.Generic.List(Of Integer)()
				Dim val As String
				For Each val in Report.Parameters(DownTimeParameterName).Value
					DownTimeTable.Add(CInt(val))
				Next
			End If
			
			Return DownTimeTable.Contains(CInt(time))
	End Select
End Function

SQL Story

SP execute

How to run the sp

Microsoft_SystemCenter_DataWarehouse_Report_Library_AvailabilityReportDataGet:

exec Microsoft_SystemCenter_DataWarehouse_Report_Library_AvailabilityReportDataGet @ObjectList=N'<Data><Objects><Object Use="Containment">137</Object></Objects></Data>',@MonitorName=N'System.Health.AvailabilityState',@StartDate='2021-12-01 08:54:00',@EndDate='2021-12-16 08:54:00',@DataAggregation=0,@LanguageCode=N'ENU'

The Xml used in the SP for Group Containment.

<Data><Objects><Object Use="Containment">137</Object></Objects></Data>

The number used represent ManagedEntityRowId in OperationsManagerDW

emrgcl / SCOMAvailability