Check eventlog status in powershell


When we monitor servers, we need to get notified if there are new errors and/or warnings in the Windows Eventlog.. Normally, it is the Application event log we check for these errors and warnings. The required functionality is that the script should check for errors and warnings on the current machine and if the number of event exceeds a maximum, the script should send an email to administrator to notify that some further investigation is needed on the server.

Here is the second powershell script I wrote today:

CHECK_EVENT_LOG_STATISTICS.PS1:

param([String]$logname="Application", [Int]$maxEventCount=10)

$since = ((get-date).addDays(-1));

$errwarnlist =  Get-Eventlog -logname $logname -after $since 
			-EntryType Error, Warning
$linecount = $errwarnlist | Measure-Object –Line

$msg = $env:COMPUTERNAME + " " + $logname + " eventlog has " 
       + $linecount.Lines  
       + " errors/warnings since " + $since.ToString("dd.MM.yyy HH:mm") 
       + ". Limit = " + $maxEventCount;

if ($linecount.Lines -gt $maxEventCount)
{
    $xto = john.doe@company.com
    $xfrom = "no-reply@company.com"
    $xsub = $env:COMPUTERNAME + ": " + $logname 
            + " eventlog exceeds limit for errors/warnings";

    Write-host $msg

    Send-MailMessage -To $xto -From $xfrom  
                 -Subject $xsub  -Body $msg 
                 -SmtpServer smtp.company.com
}
else
{
    Write-host $msg
}
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