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Data Collection Agent: Number of non-critical messages that could not be enqueued into LYSS and were dropped by the dispatcher queue

Microsoft.LS.2019.Monitoring.UnitMonitor.ThresholdPC.Registrar.PERF_DATACOLLECTION_AgentDispatcherQueue_NON_CRITICAL_MESSAGES_DROPPED (UnitMonitor)

Knowledge Base article:

Summary

The total number of non-critical messages dropped by the dispatcher queue.

Causes

This can occur due to server overload, Storage Service connectivity issues, or internal errors. Generally, Storage Service or its dependent components is the cause of the slow or blocked processing resulting in dropped messages.

Resolutions

An immediate investigation to find the root cause of this torpid processing of the data by Storage Service or its dependent components is required in order to prevent further data loss and return to a normal state. Looking for error events from the Storage Service will provide a good start to the investigation. Taking this server out of rotation might be necessary to prevent further data loss, to help buy more time to resolve the root cause of the issue and to let the dispatcher queue reduce its backlog.

Element properties:

TargetMicrosoft.LS.2019.Component.Registrar
Parent MonitorSystem.Health.PerformanceState
CategoryPerformanceHealth
EnabledTrue
Alert GenerateTrue
Alert SeverityError
Alert PriorityHigh
Alert Auto ResolveTrue
Monitor TypeMicrosoft.LS.2019.Performance.Double.DeltaThresholdMonitor
RemotableTrue
AccessibilityPublic
Alert Message
[Skype] The total number of non-critical messages dropped by the dispatcher queue.
Perf Object Name:
Perf Counter Name: {0}
Perf Counter Value: {1}
Error Threshold: 500
Warning Threshold: 250
Delta Window Size: 2
Instances to include (wildcard supported): _Total
Instances to exclude (wildcard supported): None
Please see the 'Product Knowledge' and the 'Alert Context' tab on Alert Properties view for more information.
RunAsDefault

Source Code:

<UnitMonitor ID="Microsoft.LS.2019.Monitoring.UnitMonitor.ThresholdPC.Registrar.PERF_DATACOLLECTION_AgentDispatcherQueue_NON_CRITICAL_MESSAGES_DROPPED" Accessibility="Public" Enabled="true" Target="SFBDiscovery!Microsoft.LS.2019.Component.Registrar" ParentMonitorID="Health!System.Health.PerformanceState" Remotable="true" Priority="Normal" TypeID="Microsoft.LS.2019.Performance.Double.DeltaThresholdMonitor" ConfirmDelivery="false">

  <Category>PerformanceHealth</Category>

  <AlertSettings AlertMessage="Alert_The_total_number_of_non_critical_messages_dropped_by_the_dispatcher_queue.">

    <AlertOnState>Error</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>High</AlertPriority>

    <AlertSeverity>Error</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Data/Context/CounterName$</AlertParameter1>

      <AlertParameter2>$Data/Context/Value$</AlertParameter2>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

    <OperationalState ID="Microsoft.LS.2019.Monitoring.UnitMonitor.ThresholdPC.Registrar.PERF_DATACOLLECTION_AgentDispatcherQueue_NON_CRITICAL_MESSAGES_DROPPED_OverThreshold" MonitorTypeStateID="OverThreshold" HealthState="Error"/>

    <OperationalState ID="Microsoft.LS.2019.Monitoring.UnitMonitor.ThresholdPC.Registrar.PERF_DATACOLLECTION_AgentDispatcherQueue_NON_CRITICAL_MESSAGES_DROPPED_UnderThreshold" MonitorTypeStateID="UnderThreshold" HealthState="Success"/>

    <OperationalState ID="Microsoft.LS.2019.Monitoring.UnitMonitor.ThresholdPC.Registrar.PERF_DATACOLLECTION_AgentDispatcherQueue_NON_CRITICAL_MESSAGES_DROPPED_UnderThresholdOverThreshold" MonitorTypeStateID="UnderThresholdOverThreshold" HealthState="Warning"/>

  </OperationalStates>

  <Configuration>

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

    <CounterName>UDC - Number of Non-Critical Messages Dropped</CounterName>

    <ObjectName>LS:DATACOLLECTION - Dispatcher Queues in the Data Collection Agent</ObjectName>

    <AllInstances>true</AllInstances>

    <Frequency>900</Frequency>

    <IncludeInstances>

      <RegExExpression>

        <ValueExpression>

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

        </ValueExpression>

        <Operator>MatchesWildcard</Operator>

        <Pattern>_Total</Pattern>

      </RegExExpression>

    </IncludeInstances>

    <ExcludeInstances/>

    <WarningThreshold>250</WarningThreshold>

    <ErrorThreshold>500</ErrorThreshold>

    <NumSamples>2</NumSamples>

  </Configuration>

</UnitMonitor>