A PowerShell script that emits Nagios compatible output when asked max number of processes running (over a certain amount of time) - use with NSClient++

nsc_check_longrunning_processes.ps1

Param(
  [Parameter(Mandatory=$true, ValueFromPipeline=$true)]
  [string]
  $Process,

  [Parameter(Mandatory=$true)]
  #[string]
  [ValidatePattern("^(\d\.){0,1}(([0|1]\d)|(2[0-3])):[0-5]\d:[0-5]\d")]
  $TimeSpan,

  [Parameter(Mandatory=$false)]
  [ValidateRange(0, 1000)]
  [Int]
  $MaxWarn = 1,

  [Parameter(Mandatory=$false)]
  [ValidateRange(0, 1000)]
  [Int]
  $MaxCritical = 0
)

Function ProcessesExceeding
{
  Param(
    [Parameter(Mandatory=$true, ValueFromPipeline=$true)]
    [string]
    $ProcessName,

    [Parameter(Mandatory=$true)]
    [TimeSpan]
    $MaximumRunTime
  )
  Process
  {
    Get-Process |
    ? { $_.Name -eq $ProcessName -and `
      ((New-TimeSpan $_.StartTime) -gt $MaximumRunTime) } |
    % {
      $params = @{
        InputObject = $_;
        MemberType = 'NoteProperty';
        Name = 'TotalMinutesRunning';
        Value = ((New-TimeSpan $_.StartTime).TotalMinutes);
        PassThru = $true;
      }
      Add-Member @params
    }
  }
}

$parsedTime = [TimeSpan]::Parse($TimeSpan)
$procs = ProcessesExceeding $Process $parsedTime

$running = if ($null -eq $procs) { 0 }
  else { $procs.Length }

$averageRuntime = if ($null -eq $procs) { 0 }
  else
  {
    $procs |
      Measure-Object TotalMinutesRunning -Average |
      % { [Math]::Round($_.Average, 2) }
  }

$status = if ($running -ge $MaxCritical) { "Critical" }
   elseif ($running -ge $MaxWarn) { "Warning" }
   else {"OK" }

Write-Host ("${status}: Processes Running More Than ${parsedTime}: $running|" +
  "'$Process'=$running;$averageRuntime;$MaxWarn;$MaxCritical")