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Availability Group Automatic Failover monitor

Microsoft.SQLServer.2016.AlwaysOn.AutomaticFailoverReadiness (UnitMonitor)

Availability Group Automatic Failover

Knowledge Base article:

Summary

This monitor checks whether the availability group has at least one secondary replica which is failover ready. The monitor is unhealthy and alert is raised when the failover mode of primary replica is automatic but none of secondary replica in the availability group is automatic failover ready. The monitor is healthy when at least one secondary replica is automatic failover ready.

Causes

The availability group is not ready for automatic failover. The primary replica is configured for automatic failover; however, the secondary replica is not ready for automatic failover. The secondary replica that is configured for automatic failover might be unavailable or its data synchronization state is currently not SYNCHRONIZED.

Resolutions

Overrideable Parameters

Name

Description

Default Value

Enabled

Enables or disables the workflow.

Yes

Generates Alerts

Defines whether the workflow generates an Alert.

No

Interval (seconds)

The recurring interval of time in seconds in which to run the workflow.

900

Timeout (seconds)

Specifies the time the workflow is allowed to run before being closed and marked as failed.

300

Element properties:

TargetMicrosoft.SQLServer.2016.AlwaysOn.AvailabilityGroupHealth
Parent MonitorSystem.Health.AvailabilityState
CategoryAvailabilityHealth
EnabledTrue
Alert GenerateFalse
Alert Auto ResolveFalse
Monitor TypeMicrosoft.SQLServer.2016.AlwaysOn.SystemPolicyScriptMonitorType
RemotableTrue
AccessibilityPublic
RunAsMicrosoft.SQLServer.MonitoringAccount

Source Code:

<UnitMonitor ID="Microsoft.SQLServer.2016.AlwaysOn.AutomaticFailoverReadiness" RunAs="GPMP!Microsoft.SQLServer.MonitoringAccount" TypeID="Microsoft.SQLServer.2016.AlwaysOn.SystemPolicyScriptMonitorType" Accessibility="Public" Enabled="true" ParentMonitorID="Health!System.Health.AvailabilityState" Remotable="true" Target="AlwaysOnDisc!Microsoft.SQLServer.2016.AlwaysOn.AvailabilityGroupHealth" Priority="Normal">

  <Category>AvailabilityHealth</Category>

  <OperationalStates>

    <OperationalState ID="Success" MonitorTypeStateID="HealthState" HealthState="Success"/>

    <OperationalState ID="Critical" MonitorTypeStateID="ErrorState" HealthState="Error"/>

  </OperationalStates>

  <Configuration>

    <Interval>900</Interval>

    <TimeoutSeconds>300</TimeoutSeconds>

    <PolicyName>$Target/Property[Type="AlwaysOnDisc!Microsoft.SQLServer.2016.AlwaysOn.AvailabilityGroupHealth"]/AvailabilityGroupName$-AlwaysOnAgAutomaticFailoverHealthPolicy</PolicyName>

    <InstanceName>$Target/Property[Type="AlwaysOnDisc!Microsoft.SQLServer.2016.AlwaysOn.AvailabilityGroupHealth"]/InstanceName$</InstanceName>

  </Configuration>

</UnitMonitor>