# windows-update-pending.ps1 — count of pending Windows updates.

$Url      = "YOUR_URL/wsus"
$Session  = New-Object -ComObject "Microsoft.Update.Session"
$Searcher = $Session.CreateUpdateSearcher()
try {
  $Pending = ($Searcher.Search("IsInstalled=0 and Type='Software'")).Updates.Count
  $Reboot  = ((New-Object -ComObject "Microsoft.Update.SystemInfo").RebootRequired) -as [bool]
} catch {
  $Pending = -1
  $Reboot  = $false
}

$Body = (@{
  hostname         = $env:COMPUTERNAME
  pending_count    = $Pending
  reboot_required  = $Reboot
}) | ConvertTo-Json -Compress

Invoke-RestMethod -Uri $Url -Method Post -Body $Body `
  -ContentType "application/json" -TimeoutSec 15 | Out-Null