Monitors Configured Cache Size
Event based monitor, which monitors configured cache limit.
Warning State
Triggered by event with ID 7688. Cause: The size of the cache on DNS Server is approaching its configured limit. An event has been fired by recursion thread to bring down the cache size within the configured limit. The system may experience momentary CPU spikes.
Critical State
Triggered by event with ID 7689. Cause: The size of the cache on DNS Server is approaching its configured limit. Timeout thread has started to bring down the cache size within the configured limit. The system may experience momentary CPU spikes.
Healthy state could be triggered by event with ID 7690: The size of the cache on DNS Server has been brought within its configured limit.
The DNS Server will automatically scavenge and if needed flush the cache to bring it under the configured limit. The users might experience CPU spikes due to this. If this error is too frequent then please check the configured cache limit. If it is too low for your deployment change accordingly.
Target | Microsoft.Windows.DNSServer.2016.Server | ||
Parent Monitor | System.Health.AvailabilityState | ||
Category | AvailabilityHealth | ||
Enabled | True | ||
Alert Generate | True | ||
Alert Severity | MatchMonitorHealth | ||
Alert Priority | Normal | ||
Alert Auto Resolve | True | ||
Monitor Type | Microsoft.Windows.3SingleEventLog3StateUnitMonitorType | ||
Remotable | True | ||
Accessibility | Public | ||
Alert Message |
| ||
RunAs | Microsoft.Windows.DNSServer.2016.ActionAccount |
<UnitMonitor ID="Microsoft.Windows.DNSServer.2016.Monitor.CacheLimitHit" Accessibility="Public" Enabled="true" Target="Microsoft.Windows.DNSServer.2016.Server" ParentMonitorID="Health!System.Health.AvailabilityState" Remotable="true" Priority="Normal" RunAs="Microsoft.Windows.DNSServer.2016.ActionAccount" TypeID="Windows!Microsoft.Windows.3SingleEventLog3StateUnitMonitorType" ConfirmDelivery="true">
<Category>AvailabilityHealth</Category>
<AlertSettings AlertMessage="Microsoft.Windows.DNSServer.2016.Monitor.CacheLimitHit_AlertMessageResourceID">
<AlertOnState>Warning</AlertOnState>
<AutoResolve>true</AutoResolve>
<AlertPriority>Normal</AlertPriority>
<AlertSeverity>MatchMonitorHealth</AlertSeverity>
<AlertParameters>
<AlertParameter1>$Data/Context/EventDisplayNumber$</AlertParameter1>
<AlertParameter2>$Data/Context/EventSourceName$</AlertParameter2>
<AlertParameter3>$Data/Context/Channel$</AlertParameter3>
<AlertParameter4>$Data/Context/EventDescription$</AlertParameter4>
</AlertParameters>
</AlertSettings>
<OperationalStates>
<OperationalState ID="WarningState" MonitorTypeStateID="FirstEventRaised" HealthState="Warning"/>
<OperationalState ID="ErrorState" MonitorTypeStateID="SecondEventRaised" HealthState="Error"/>
<OperationalState ID="SuccessState" MonitorTypeStateID="ThirdEventRaised" HealthState="Success"/>
</OperationalStates>
<Configuration>
<FirstComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</FirstComputerName>
<FirstLogName>DNS Server</FirstLogName>
<FirstExpression>
<SimpleExpression>
<ValueExpression>
<XPathQuery Type="UnsignedInteger">EventDisplayNumber</XPathQuery>
</ValueExpression>
<Operator>Equal</Operator>
<ValueExpression>
<Value Type="UnsignedInteger">7688</Value>
</ValueExpression>
</SimpleExpression>
</FirstExpression>
<SecondComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</SecondComputerName>
<SecondLogName>DNS Server</SecondLogName>
<SecondExpression>
<SimpleExpression>
<ValueExpression>
<XPathQuery Type="UnsignedInteger">EventDisplayNumber</XPathQuery>
</ValueExpression>
<Operator>Equal</Operator>
<ValueExpression>
<Value Type="UnsignedInteger">7689</Value>
</ValueExpression>
</SimpleExpression>
</SecondExpression>
<ThirdComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</ThirdComputerName>
<ThirdLogName>DNS Server</ThirdLogName>
<ThirdExpression>
<SimpleExpression>
<ValueExpression>
<XPathQuery Type="UnsignedInteger">EventDisplayNumber</XPathQuery>
</ValueExpression>
<Operator>Equal</Operator>
<ValueExpression>
<Value Type="UnsignedInteger">7690</Value>
</ValueExpression>
</SimpleExpression>
</ThirdExpression>
</Configuration>
</UnitMonitor>