Unit monitors are used to monitor specific counters, events, scripts, and services. Unit monitors can be rolled up to either dependency or aggregate rollup monitors. You have the option to set the monitor to generate an alert.
For an example of how to create a unit monitor to monitor an event log see, How to Create an Event Log Unit Monitor.
The following code example shows how to create a unit monitor that monitors the state of a service:
// // Creates a unit monitor. // using Microsoft.EnterpriseManagement; using Microsoft.EnterpriseManagement.Administration; using Microsoft.EnterpriseManagement.Common; using Microsoft.EnterpriseManagement.Configuration; using Microsoft.EnterpriseManagement.Monitoring; using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Text; namespace SDKSamples { class Program { //------------------------------------------------------------------- static void Main(string[] args) { ManagementGroup mg; ManagementPack mp; ManagementPackClass monitoringClass; ManagementPackClassCriteria monitoringClassCriteria; ManagementPackUnitMonitor serviceMonitor; ManagementPackUnitMonitorType serviceMonitorType; mg = new ManagementGroup("localhost"); mp = mg.ManagementPacks.GetManagementPacks(new ManagementPackCriteria("Name='SampleManagementPack'"))[0]; monitoringClassCriteria = new ManagementPackClassCriteria( "DisplayName='Windows Server 2003 Operating System'"); monitoringClass = mg.EntityTypes.GetClasses(monitoringClassCriteria)[0]; serviceMonitorType = mg.Monitoring.GetUnitMonitorTypes( new ManagementPackUnitMonitorTypeCriteria("Id = 'Microsoft.Windows.CheckNTServiceStateMonitorType'"))[0]; serviceMonitor = new ManagementPackUnitMonitor( mp, "SampleServiceMonitor", ManagementPackAccessibility.Internal); serviceMonitor.DisplayName = "Sample Service Monitor"; serviceMonitor.TypeID = serviceMonitorType; serviceMonitor.Target = monitoringClass; ConfigureAlertSettings(serviceMonitor,serviceMonitorType,mp); ConfigureHealthStates(serviceMonitor, serviceMonitorType); SpecifyMonitorConfiguration(serviceMonitor); SpecifyParentMonitor(serviceMonitor, mg); mp.Verify(); //Save the changes into the management pack. mp.AcceptChanges(); } private static void SpecifyParentMonitor( ManagementPackUnitMonitor serviceMonitor, ManagementGroup mg ) { ManagementPackAggregateMonitor parentMonitor; ManagementPackMonitorCriteria monitorCriteria; monitorCriteria = new ManagementPackMonitorCriteria("Name='System.Health.AvailabilityState'"); parentMonitor = (ManagementPackAggregateMonitor)mg.Monitoring.GetMonitors(monitorCriteria)[0]; serviceMonitor.ParentMonitorID = parentMonitor; } //------------------------------------------------------------------- private static void SpecifyMonitorConfiguration( ManagementPackUnitMonitor serviceMonitor ) { string monitorConfig; monitorConfig = @"<ComputerName>$Target/Host/Property[Type=""Windows!Microsoft.Windows.Computer""]/NetworkName$</ComputerName> <ServiceName>Alerter</ServiceName>"; serviceMonitor.Configuration = monitorConfig; } //------------------------------------------------------------------- private static void ConfigureHealthStates( ManagementPackUnitMonitor serviceMonitor, ManagementPackUnitMonitorType serviceMonitorType ) { ManagementPackUnitMonitorOperationalState healthyState; ManagementPackUnitMonitorOperationalState errorState; healthyState = new ManagementPackUnitMonitorOperationalState(serviceMonitor, "Success"); errorState = new ManagementPackUnitMonitorOperationalState(serviceMonitor, "Error"); healthyState.HealthState = HealthState.Success; healthyState.MonitorTypeStateID = "Running"; errorState.HealthState = HealthState.Error; errorState.MonitorTypeStateID = "NotRunning"; serviceMonitor.OperationalStateCollection.Add(healthyState); serviceMonitor.OperationalStateCollection.Add(errorState); } //------------------------------------------------------------------- private static void ConfigureAlertSettings( ManagementPackUnitMonitor serviceMonitor, ManagementPackUnitMonitorType unitMonitorType, ManagementPack mp ) { serviceMonitor.AlertSettings = new ManagementPackMonitorAlertSettings(); serviceMonitor.AlertSettings.AlertOnState = HealthState.Error; serviceMonitor.AlertSettings.AutoResolve = true; serviceMonitor.AlertSettings.AlertPriority = ManagementPackWorkflowPriority.Normal; serviceMonitor.AlertSettings.AlertSeverity = ManagementPackAlertSeverity.Error; serviceMonitor.AlertSettings.AlertParameter1 = @"$Target/Host/Property[Type=""Windows!Microsoft.Windows.Computer""]/NetworkName$"; //this points to the computer name ManagementPackStringResource alertMessage; alertMessage = new ManagementPackStringResource(mp, "SampleAlertMessage"); alertMessage.DisplayName = "The Alerter service is stopped"; alertMessage.Description = "The Alerter service is stopped on computer {0}."; serviceMonitor.AlertSettings.AlertMessage = alertMessage; } } }