System Center 2019+ Virtual Machine Manager Tier Member Count

Microsoft.SystemCenter.VirtualMachineManager.TierMemberCountMonitor (UnitMonitor)

Monitors whether the virtual machine tier member count is within the specified range

Knowledge Base article:

Summary

The virtual machine tier member count monitor determines whether the current instance count of a virtual machine tier of a service is outside of its configured minimum and maximum instance count.

Causes

If the current instance count of a computer tier is below the defined minimum instance count or above the defined maximum instance count, the monitor will go into an unhealthy state.

Resolutions

If the virtual machine tier is below its prescribed instance count, either use the VMM scale out feature to add one or more instances to the virtual machine tier in order to meet the defined minimum instance count or redefine the virtual machine tier to reflect different minimum and maximum instance definitions.

If the virtual machine tier is above its prescribed instance count, either remove one or more instances from the virtual machine tier in order to meet the defined maximum instance count or redefine the virtual machine tier to reflect different minimum and maximum instance definitions.

Element properties:

Target

Microsoft.SystemCenter.VirtualMachineManager.Discovery.ComputerTier

Parent Monitor

System.Health.AvailabilityState

Category

AvailabilityHealth

Enabled

True

Alert Generate

True

Alert Severity

Error

Alert Priority

Normal

Alert Auto Resolve

True

Monitor Type

Microsoft.SystemCenter.VirtualMachineManager.CheckValueWithinRangeMonitorType

Remotable

True

Accessibility

Public

Alert Message

Tier member count not within range

The virtual machine tier member count for service {3} is {0}, it should be ≥ {1} and ≤ {2}

RunAs

Default

Source Code:

<UnitMonitor ID="Microsoft.SystemCenter.VirtualMachineManager.TierMemberCountMonitor" Accessibility="Public" Target="VMMDiscovery!Microsoft.SystemCenter.VirtualMachineManager.Discovery.ComputerTier" TypeID="Microsoft.SystemCenter.VirtualMachineManager.CheckValueWithinRangeMonitorType" ParentMonitorID="SystemHealth!System.Health.AvailabilityState">

  <Category>AvailabilityHealth</Category>

  <AlertSettings AlertMessage="Microsoft.SystemCenter.VirtualMachineManager.TierMemberCountMonitor.AlertMessage">

    <AlertOnState>Error</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>Error</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Target/Property[Type="VMMBase!Microsoft.SystemCenter.VirtualMachineManager.ComputerTier"]/CurrentMachineCount$</AlertParameter1>

      <AlertParameter2>$Target/Property[Type="VMMBase!Microsoft.SystemCenter.VirtualMachineManager.ComputerTier"]/MinMachineCount$</AlertParameter2>

      <AlertParameter3>$Target/Property[Type="VMMBase!Microsoft.SystemCenter.VirtualMachineManager.ComputerTier"]/MaxMachineCount$</AlertParameter3>

      <AlertParameter4>$Target/Host/Property[Type="System!System.Entity"]/DisplayName$</AlertParameter4>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

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

    <OperationalState ID="TierMemberCountCritical" MonitorTypeStateID="ValueWithinRangeCritical" HealthState="Error"/>

  </OperationalStates>

  <Configuration>

    <IntervalSeconds>300</IntervalSeconds>

    <TimeoutSeconds>300</TimeoutSeconds>

    <MinValue>$Target/Property[Type="VMMBase!Microsoft.SystemCenter.VirtualMachineManager.ComputerTier"]/MinMachineCount$</MinValue>

    <MaxValue>$Target/Property[Type="VMMBase!Microsoft.SystemCenter.VirtualMachineManager.ComputerTier"]/MaxMachineCount$</MaxValue>

    <CurrentValue>$Target/Property[Type="VMMBase!Microsoft.SystemCenter.VirtualMachineManager.ComputerTier"]/CurrentMachineCount$</CurrentValue>

  </Configuration>

</UnitMonitor>