I have created an alert in Performance Monitor (Windows Server 2008 R2) that should be triggered whenever \Processor(_Total)\% Processor Time is Above 10 (a small value just to guarantee that the condition for sending the alert is always met). You can see the Alert Task properties in the image.

In addition, I have also created a new task in the Task Scheduler that will run whether the user is logged on or not, and it will run with highest privileges. The trigger for this task has the following properties:

  • Begin the task: On an event
  • Settings: Basic
  • Log: System
  • Source: Processor

The Actions (and this is the part I don't know if it's correct) has the following settings:

  • Action: Start a program
  • Program/script: the path to a PowerShell script to send an email.

The PowerShell code is the following ($name, $date, $counter, $threshold, $value are supposed to come from the Performance Monitor data collector set alert task properties, as in the image above):

function SendMail ($name, $date, $counter, $threshold, $value) {

  $MailMessage = New-Object Net.Mail.MailMessage

  $MailMessage.To.Add("myemail@blah.bleh")

  $MailMessage.From = "do-not-reply@blah.bleh"

  $MailMessage.Subject = "ALERT - Performance Monitor"

  $MailMessage.IsBodyHtml = $True

  $MailMessage.Body = @"

    <html><head></head><body>

    The following counter needs attention:<BR><BR>

    Name: $($name)<BR>

    Date: $($date)<BR>

    Counter: $($counter)<BR>

    Threshold: $($threshold)<BR>

    Actual Value: $($value)<BR>

    <FONT face=Courier>$($html)</FONT>

    <BR>

    --- Automatically generated with SENDMAIL function ---

    </body>

    </html>

"@

  $SmtpClient = New-Object Net.Mail.SmtpClient("blah.bleh")

  $SmtpClient.Send($MailMessage)

}

Once the task is started, I have the following in the History: Task Started, Action Started, and Created ask Process. The email is never sent though.

I tried sending an email using the Action: Send an email, and it worked fine. Does anyone know what could be wrong?

        asked Aug 27 '13 at 21:08    
Anna 195211    
 
 
                                                                                        
                                                                                                                    
                                                                                                 
 
                                                                     
   
                                                                                                                    
                                                                        
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1 Answer                                 1

     up vote4down voteaccepted

There are basically two things to address that should make this work for you.

  1. Get the alert parameters correctly passed to your script.
  2. Actually call the function defined in your script.

We'll start with the parameters.  On the Alert Task tab of your alert (pictured above), edit the Task Arguments field and replace:

{name}{date}{counter}{threshold}{value}

with:

"{name}" "{date}" "{counter}" "{threshold}" "{value}"

Your parameters are basically being parsed as a space-separated string value, so we add double-quotes around each individual parameter token to handle values that include spaces, and we add a space between each individual parameter token so that we'll be able to tell one parameter from the next.

Then, for the action of your scheduled task (named "Processor Monitoring") you have to tell it to expect parameters from the alert and to pass those parameters to the PowerShell script.

Your Action is correct, i.e. "Start a program".

For the Program/script field, enter "powershell.exe" (or browse for the full path).

And for the Add Arguments field, enter this:

-File C:\path\to\your\PowerShell\scripts\perfmon_send_email.ps1 $(Arg0)

Where perfmon_send_email.ps1 is the script file containing your SendMail() function as described above.

This bit was kind of finicky, so there may be other ways to set this up, but explicitly using the -File parameter made a difference for my tests.  The $(Arg0) part is what gets replaced with the parameter string from the Alert when the scheduled task executes PowerShell to run your script.

So that should make the Alert parameters available to your PowerShell script.  Now all you have to do is actually call the function you've already defined.  Add the following to the end of your script (after the function definition):

# Get parameter values by position and pass them to the SendMail() function.

SendMail $args[0] $args[1] $args[2] $args[3] $args[4]

$args is an array containing the parameter values passed to a script file called from the command line, which is exactly what we configured the scheduled task to do.

Since we know the alert will always send the same values in the same order, i.e. name, date, counter, threshold, and value, we can just pull them from the command line arguments based on position and pass them to the SendMail() function.

Note that there are more robust ways to process command line arguments, but this should be sufficient for your purposes.

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