Application Pool Monitoring for SharePoint using PowerShell Script

Import-Module WebAdministration

#Array to hold Server names - Change it to YOUR SharePoint front end servers
$WFEServers =("HS-WFE01", "HS-WFE02", "HS-WFE03")

#Log file location
$LogFile = "D:\Scripts\AppPool-Log.txt"

#Loop through each server and Check Application Pool status
foreach ($Server in $WFEServers)
{
    $ServerMgr = [Microsoft.Web.Administration.ServerManager]::OpenRemote($Server)

    #Get all Application Pools which are not in Started State
    $AppPoolColl = $ServerMgr.ApplicationPools | Where-Object {$_.State -ne "Started"}

    foreach($AppPool in $AppPoolColl)
    {
        #Get the time to Log
        $now = Get-Date -f "yyyy-MM-dd HH:mm:ss"

        #Log to file
        "`n Found Application Pool: $($AppPool.name) in stopped state at the server : $($Server) on $($now)" >> $LogFile
        "Trying to Start the application Pool...">> $LogFile
        
        #Try Starting the application Pool
        $AppPool.Start()
        Start-Sleep -s 10
        "Application Pool's current Status: $($AppPool.State)" >> $LogFile

        #Send Alert-Mail message
        $emailFrom = "AppPoolMonitor@crescent.com"
        # Use commas for multiple addresses
        $emailTo = "SPAdmins@crescent.com"
        $subject = "Application Pool: $($AppPool.Name) in stopped state in Server: $($Server) at $($now)"
        $body = "Hi SharePoint Team, `n `n The Application Pool $($AppPool.name) was in stopped state in server: $($server). `n`n We tried Re-starting it... Current State of the Application Pool: $($AppPool.State). `n`n Please take necessary actions if its not started !. `n `nThanks, `nSharePoint AppPool Monitoring Script."
        $smtpServer = "smtp.crescent.com" #IP or HOST Name of SMTP Server
        $smtp = new-object Net.Mail.SmtpClient($smtpServer)
        $smtp.Send($emailFrom, $emailTo, $subject, $body) 
    } 
}