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Microsoft Audit Collection Services Collector Event Stream Gap Detected

Microsoft.SystemCenter.ACS.Collector.EventStreamGap (Rule)

Knowledge Base article:

Summary

This monitor and alert indicates that the ACS Collector detected a gap from the incoming event stream from an ACS forwarder. This means some events may be missing due to event log wrapping or someone clearing the event log on the managed computer.

The alert is raised when the rule detects event: Source = AdtServer and ID = 4635.

Causes

The alert can indicate the following may be happening on the agent:

Resolutions

Element properties:

TargetMicrosoft.SystemCenter.ACS.Collector
CategoryAlert
EnabledTrue
Event_ID4635
Event SourceAdtServer
Alert GenerateTrue
Alert SeverityWarning
Alert PriorityNormal
RemotableTrue
Alert Message
Microsoft Audit Collection Services Collector Event Stream Gap Detected
Microsoft Audit Collection Services Collector detected a gap in the event stream from Forwarder {0}.
Event LogOperations Manager

Member Modules:

ID Module Type TypeId RunAs 
DS DataSource Microsoft.Windows.EventProvider Default
Alert WriteAction System.Health.GenerateAlert Default

Source Code:

<Rule ID="Microsoft.SystemCenter.ACS.Collector.EventStreamGap" Enabled="true" Target="Microsoft.SystemCenter.ACS.Collector" ConfirmDelivery="true" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>Alert</Category>

  <DataSources>

    <DataSource ID="DS" TypeID="Windows!Microsoft.Windows.EventProvider">

      <ComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</ComputerName>

      <LogName>Operations Manager</LogName>

      <Expression>

        <And>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery Type="UnsignedInteger">EventDisplayNumber</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value Type="UnsignedInteger">4635</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery Type="String">PublisherName</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value Type="String">AdtServer</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

        </And>

      </Expression>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="Alert" TypeID="Health!System.Health.GenerateAlert">

      <Priority>1</Priority>

      <Severity>1</Severity>

      <AlertName/>

      <AlertDescription/>

      <AlertOwner/>

      <AlertMessageId>$MPElement[Name="Microsoft.SystemCenter.ACS.Collector.EventStreamGap.AlertMessage"]$</AlertMessageId>

      <AlertParameters>

        <AlertParameter1>$Data/Params/Param[1]$</AlertParameter1>

      </AlertParameters>

      <Suppression>

        <SuppressionValue>$Data/EventDisplayNumber$</SuppressionValue>

        <SuppressionValue>$Data/PublisherName$</SuppressionValue>

        <SuppressionValue>$Data/LoggingComputer$</SuppressionValue>

        <SuppressionValue>$Data/Params/Param[1]$</SuppressionValue>

      </Suppression>

      <Custom1>$Data/Params/Param[1]$</Custom1>

      <Custom2/>

      <Custom3/>

      <Custom4/>

      <Custom5/>

      <Custom6/>

      <Custom7/>

      <Custom8/>

      <Custom9/>

      <Custom10/>

    </WriteAction>

  </WriteActions>

</Rule>