Veeam: Check for failed backups with Nagios

#http://www.sightunseen.org/files/vm_backup_status.ps1
asnp "VeeamPSSnapIn" -ErrorAction SilentlyContinue

####################################################################
# Configuration
# vCenter server
$vcenter = "vcenter.yourdomain.com"
# To Exclude VMs from report add VM names to be excluded as follows
$excludevms=@("")

### reset variables for debugging only
$backups_with_errors = $nul
$number_of_backups_with_errors = $nul
$failedbackups = $nul
$backups_with_errors = $nul
$numberofprotectedvms = $nul
$vms=""
####################################################################

$vcenterobj = Get-VBRServer -Name $vcenter
$backups_with_errors = $nul

# Build hash table with excluded VMs
$excludedvms=@{}
foreach ($vm in $excludevms) {
    $excludedvms.Add($vm, "Excluded")
}

# Get a list of all VMs from vCenter and add to hash table, assume Unprotected
$vms=@{}

# only monitor those VMs on Production. To monitor all VMs registered on vCenter, just remove the and -match
foreach ($vm in (Find-VBRObject -Server $vcenterobj -WarningAction "SilentlyContinue"  | Where-Object {$_.Type -eq "VirtualMachine"  -and $_.Datastores -match "DATASTORE_PRODUCTION" }))  {
    if (!($excludedvms.ContainsKey($vm.Name) -or $vms.ContainsKey($vm.Name))) {
        $vms.Add($vm.Name, "Unprotected")
    }
}

# Find all backup job sessions that have ended in the last 24 hours

$vbrsessions = Get-VBRBackupSession | Where-Object {$_.JobType -eq "Backup" -and $_.EndTime -ge (Get-Date).addhours(-24)}

# Find all successfully backed up VMs in selected sessions (i.e. VMs not ending in failure) and update status to "Protected"
foreach ($session in $vbrsessions) {
    foreach ($vm in ($session.gettasksessions() | Where-Object {$_.Status -ne "Failed"} | ForEach-Object { $_ })) {
        if($vms.ContainsKey($vm.Name)) {
            $vms[$vm.Name]="Protected"
        }
    }
}

#$failedbackups=""
#$number_of_backups_with_errors = 0


# Output VMs in color coded format based on status.
foreach ($vm in $vms.Keys)
{
  if ($vms[$vm] -eq "Protected") {
      #write-host -foregroundcolor green "$vm is backed up"


  } else {
      #write-host -foregroundcolor red "$vm is NOT backed up"
      $backups_with_errors = $true
      $failedbackups=$failedbackups+":"+$vm
      $number_of_backups_with_errors = $number_of_backups_with_errors+1
  }
}


if ($backups_with_errors -eq $false){
 $numberofprotectedvms = (Get-VBRRestorePoint | select {$_.VmName} -uniq).Count
 Write-Host "OK: $numberofprotectedvms VMs are protected with Veeam"
 exit 0

} else {
 if ($number_of_backups_with_errors -eq $nul)
 {Write-Host "No failed backups on DATASTORE_PRODUCTION."
 exit 0
 } else {
   Write-Host "$number_of_backups_with_errors missing Veeam Backups $failedbackups"
 }
 exit 1
}