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linux-scripts/windows-scheduled-task-exporter.ps1
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PowerShell

<#
.SYNOPSIS
Windows Scheduled Task Prometheus Metrics Exporter
.DESCRIPTION
Prometheus exporter for Windows scheduled tasks - monitors task state,
last result, run timestamps, missed runs, and enabled status. Exports
metrics as Prometheus-compatible text format for windows_exporter textfile
collector.
.PARAMETER TaskPath
The scheduled task folder path to monitor (default: "\" for all)
.PARAMETER ExcludePattern
Regex pattern to exclude task paths (default: '\\Microsoft\\' to filter
built-in Windows tasks)
.PARAMETER Mode
Output mode: 'stdout' (default), 'textfile', or 'http'
.PARAMETER Port
HTTP port for http mode (default: 9584)
.PARAMETER TextfileDir
Directory for textfile collector output (default: C:\ProgramData\node_exporter)
.PARAMETER InstallScheduledTask
Switch to create a scheduled task for auto-start on system boot
.PARAMETER TaskIntervalMinutes
Interval in minutes for the scheduled task (default: 5)
.NOTES
Author: Phil Connor
Contact: contact@mylinux.work
Website: https://mylinux.work
License: MIT
Version: 1.0
Metrics Exported:
Core Status:
- windows_scheduled_task_up
- windows_scheduled_task_exporter_info{version}
Task State:
- windows_scheduled_task_state{name,path,state}
- windows_scheduled_task_last_result{name,path}
- windows_scheduled_task_last_run_timestamp{name,path}
- windows_scheduled_task_next_run_timestamp{name,path}
- windows_scheduled_task_missed_runs{name,path}
- windows_scheduled_task_enabled{name,path}
Summary:
- windows_scheduled_task_total
- windows_scheduled_task_failed_total
- windows_scheduled_task_disabled_total
- windows_scheduled_task_running_total
Exporter:
- windows_scheduled_task_exporter_duration_seconds
- windows_scheduled_task_exporter_last_run_timestamp
#>
param(
[string]$TaskPath = '\',
[string]$ExcludePattern = '\\Microsoft\\',
[ValidateSet('stdout', 'textfile', 'http')]
[string]$Mode = 'stdout',
[int]$Port = 9584,
[string]$TextfileDir = 'C:\ProgramData\node_exporter',
[switch]$InstallScheduledTask,
[int]$TaskIntervalMinutes = 5
)
# Create a scheduled task to run this script every $TaskIntervalMinutes minutes
# The task will run as SYSTEM and will be set to run at startup
if ($InstallScheduledTask) {
$taskName = "WindowsScheduledTaskExporter"
$existingTask = Get-ScheduledTask -TaskName $taskName -ErrorAction SilentlyContinue
if (-not $existingTask) {
$taskAction = New-ScheduledTaskAction -Execute "powershell.exe" -Argument "-NoProfile -ExecutionPolicy Bypass -File `"$($MyInvocation.MyCommand.Path)`" -Mode textfile"
if (-not $TaskIntervalMinutes -or $TaskIntervalMinutes -le 0) {
throw "TaskIntervalMinutes must be a positive integer"
}
$taskTrigger = New-ScheduledTaskTrigger -Once -At (Get-Date).AddMinutes(1) -RepetitionInterval (New-TimeSpan -Minutes $TaskIntervalMinutes) -RepetitionDuration (New-TimeSpan -Days 365)
$taskPrincipal = New-ScheduledTaskPrincipal -UserId "SYSTEM" -LogonType ServiceAccount -RunLevel Highest
try {
Write-Host "Creating scheduled task: $taskName"
Register-ScheduledTask -TaskName $taskName -Action $taskAction -Trigger $taskTrigger -Principal $taskPrincipal -Description "Exports Windows scheduled task metrics for Prometheus every $TaskIntervalMinutes minutes"
$createdTask = Get-ScheduledTask -TaskName $taskName -ErrorAction SilentlyContinue
if (-not $createdTask) {
throw "Failed to verify scheduled task creation"
}
Write-Host "Successfully created scheduled task: $taskName" -ForegroundColor Green
} catch {
Write-Error "Failed to create scheduled task: $($_.Exception.Message)"
throw
}
} else {
Write-Host "Scheduled task '$taskName' already exists, skipping creation"
}
}
$ErrorActionPreference = 'SilentlyContinue'
# ============================================================================
# HELPER FUNCTIONS
# ============================================================================
function Get-UnixTimestamp {
[int][double]::Parse((Get-Date -UFormat '%s'))
}
function Format-MetricValue {
param([double]$Value, [int]$Decimals = 2)
[math]::Round($Value, $Decimals)
}
# ============================================================================
# SCHEDULED TASK METRICS
# ============================================================================
function Get-TaskMetrics {
$sb = [System.Text.StringBuilder]::new()
# Fetch all scheduled tasks
$tasks = @()
try {
$allTasks = Get-ScheduledTask -TaskPath "$TaskPath*" -ErrorAction Stop
if ($ExcludePattern) {
$tasks = $allTasks | Where-Object { $_.TaskPath -notmatch $ExcludePattern }
} else {
$tasks = $allTasks
}
} catch {
Write-Warning "Failed to query scheduled tasks: $_"
}
if (-not $tasks -or $tasks.Count -eq 0) {
return $sb.ToString()
}
# Fetch task info for all tasks
$taskInfoMap = @{}
foreach ($task in $tasks) {
try {
$info = Get-ScheduledTaskInfo -TaskName $task.TaskName -TaskPath $task.TaskPath -ErrorAction Stop
$taskInfoMap["$($task.TaskPath)$($task.TaskName)"] = $info
} catch {}
}
$states = @('Ready', 'Running', 'Disabled', 'Queued')
$failedCount = 0
$disabledCount = 0
$runningCount = 0
# --- windows_scheduled_task_state ---
[void]$sb.AppendLine('# HELP windows_scheduled_task_state Current state of the scheduled task (1=current state, 0=other states)')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_state gauge')
foreach ($task in $tasks) {
try {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
$currentState = $task.State.ToString()
foreach ($state in $states) {
$val = if ($currentState -eq $state) { 1 } else { 0 }
[void]$sb.AppendLine("windows_scheduled_task_state{name=`"$name`",path=`"$path`",state=`"$state`"} $val")
}
} catch {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
foreach ($state in $states) {
[void]$sb.AppendLine("windows_scheduled_task_state{name=`"$name`",path=`"$path`",state=`"$state`"} 0")
}
}
}
[void]$sb.AppendLine('')
# --- windows_scheduled_task_last_result ---
[void]$sb.AppendLine('# HELP windows_scheduled_task_last_result Last result code of the scheduled task (0=success)')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_last_result gauge')
foreach ($task in $tasks) {
try {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
$info = $taskInfoMap["$($task.TaskPath)$($task.TaskName)"]
$lastResult = if ($info) { $info.LastTaskResult } else { -1 }
[void]$sb.AppendLine("windows_scheduled_task_last_result{name=`"$name`",path=`"$path`"} $lastResult")
if ($lastResult -ne 0) {
$failedCount++
}
} catch {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
[void]$sb.AppendLine("windows_scheduled_task_last_result{name=`"$name`",path=`"$path`"} -1")
}
}
[void]$sb.AppendLine('')
# --- windows_scheduled_task_last_run_timestamp ---
[void]$sb.AppendLine('# HELP windows_scheduled_task_last_run_timestamp Unix timestamp of the last run')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_last_run_timestamp gauge')
foreach ($task in $tasks) {
try {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
$info = $taskInfoMap["$($task.TaskPath)$($task.TaskName)"]
$lastRun = 0
if ($info -and $info.LastRunTime -and $info.LastRunTime -ne [datetime]::MinValue) {
$lastRun = [int][double]::Parse((Get-Date $info.LastRunTime -UFormat '%s'))
}
[void]$sb.AppendLine("windows_scheduled_task_last_run_timestamp{name=`"$name`",path=`"$path`"} $lastRun")
} catch {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
[void]$sb.AppendLine("windows_scheduled_task_last_run_timestamp{name=`"$name`",path=`"$path`"} 0")
}
}
[void]$sb.AppendLine('')
# --- windows_scheduled_task_next_run_timestamp ---
[void]$sb.AppendLine('# HELP windows_scheduled_task_next_run_timestamp Unix timestamp of the next scheduled run')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_next_run_timestamp gauge')
foreach ($task in $tasks) {
try {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
$info = $taskInfoMap["$($task.TaskPath)$($task.TaskName)"]
$nextRun = 0
if ($info -and $info.NextRunTime -and $info.NextRunTime -ne [datetime]::MinValue) {
$nextRun = [int][double]::Parse((Get-Date $info.NextRunTime -UFormat '%s'))
}
[void]$sb.AppendLine("windows_scheduled_task_next_run_timestamp{name=`"$name`",path=`"$path`"} $nextRun")
} catch {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
[void]$sb.AppendLine("windows_scheduled_task_next_run_timestamp{name=`"$name`",path=`"$path`"} 0")
}
}
[void]$sb.AppendLine('')
# --- windows_scheduled_task_missed_runs ---
[void]$sb.AppendLine('# HELP windows_scheduled_task_missed_runs Number of missed runs for the scheduled task')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_missed_runs gauge')
foreach ($task in $tasks) {
try {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
$info = $taskInfoMap["$($task.TaskPath)$($task.TaskName)"]
$missed = if ($info) { $info.NumberOfMissedRuns } else { 0 }
[void]$sb.AppendLine("windows_scheduled_task_missed_runs{name=`"$name`",path=`"$path`"} $missed")
} catch {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
[void]$sb.AppendLine("windows_scheduled_task_missed_runs{name=`"$name`",path=`"$path`"} 0")
}
}
[void]$sb.AppendLine('')
# --- windows_scheduled_task_enabled ---
[void]$sb.AppendLine('# HELP windows_scheduled_task_enabled Whether the scheduled task is enabled (1=enabled, 0=disabled)')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_enabled gauge')
foreach ($task in $tasks) {
try {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
$enabled = if ($task.State -ne 'Disabled') { 1 } else { 0 }
[void]$sb.AppendLine("windows_scheduled_task_enabled{name=`"$name`",path=`"$path`"} $enabled")
if ($task.State.ToString() -eq 'Disabled') {
$disabledCount++
}
if ($task.State.ToString() -eq 'Running') {
$runningCount++
}
} catch {
$name = $task.TaskName -replace '[\\"]', ''
$path = $task.TaskPath -replace '[\\"]', ''
[void]$sb.AppendLine("windows_scheduled_task_enabled{name=`"$name`",path=`"$path`"} 0")
}
}
[void]$sb.AppendLine('')
# --- windows_scheduled_task_total ---
[void]$sb.AppendLine('# HELP windows_scheduled_task_total Total number of monitored scheduled tasks')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_total gauge')
[void]$sb.AppendLine("windows_scheduled_task_total $($tasks.Count)")
[void]$sb.AppendLine('')
# --- windows_scheduled_task_failed_total ---
[void]$sb.AppendLine('# HELP windows_scheduled_task_failed_total Count of scheduled tasks with non-zero last result')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_failed_total gauge')
[void]$sb.AppendLine("windows_scheduled_task_failed_total $failedCount")
[void]$sb.AppendLine('')
# --- windows_scheduled_task_disabled_total ---
[void]$sb.AppendLine('# HELP windows_scheduled_task_disabled_total Count of disabled scheduled tasks')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_disabled_total gauge')
[void]$sb.AppendLine("windows_scheduled_task_disabled_total $disabledCount")
[void]$sb.AppendLine('')
# --- windows_scheduled_task_running_total ---
[void]$sb.AppendLine('# HELP windows_scheduled_task_running_total Count of currently running scheduled tasks')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_running_total gauge')
[void]$sb.AppendLine("windows_scheduled_task_running_total $runningCount")
[void]$sb.AppendLine('')
$sb.ToString()
}
# ============================================================================
# COLLECT ALL METRICS
# ============================================================================
function Get-AllMetrics {
$scriptStart = Get-Date
$sb = [System.Text.StringBuilder]::new()
# Exporter up
[void]$sb.AppendLine('# HELP windows_scheduled_task_up Exporter status (1=up, 0=down)')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_up gauge')
[void]$sb.AppendLine('windows_scheduled_task_up 1')
[void]$sb.AppendLine('')
# Exporter info
[void]$sb.AppendLine('# HELP windows_scheduled_task_exporter_info Exporter version information')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_exporter_info gauge')
[void]$sb.AppendLine('windows_scheduled_task_exporter_info{version="1.0"} 1')
[void]$sb.AppendLine('')
# Collect task metrics
[void]$sb.Append((Get-TaskMetrics))
# Exporter runtime
$scriptEnd = Get-Date
$duration = Format-MetricValue ($scriptEnd - $scriptStart).TotalSeconds
$timestamp = Get-UnixTimestamp
[void]$sb.AppendLine('# HELP windows_scheduled_task_exporter_duration_seconds Time to generate all metrics')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_exporter_duration_seconds gauge')
[void]$sb.AppendLine("windows_scheduled_task_exporter_duration_seconds $duration")
[void]$sb.AppendLine('')
[void]$sb.AppendLine('# HELP windows_scheduled_task_exporter_last_run_timestamp Unix timestamp of last successful run')
[void]$sb.AppendLine('# TYPE windows_scheduled_task_exporter_last_run_timestamp gauge')
[void]$sb.AppendLine("windows_scheduled_task_exporter_last_run_timestamp $timestamp")
[void]$sb.AppendLine('')
$sb.ToString()
}
# ============================================================================
# HTTP SERVER MODE
# ============================================================================
function Start-HttpServer {
param([int]$ListenPort)
$prefix = "http://+:$ListenPort/"
$listener = [System.Net.HttpListener]::new()
$listener.Prefixes.Add($prefix)
try {
$listener.Start()
Write-Host "Starting Windows scheduled task exporter on port $ListenPort..." -ForegroundColor Green
Write-Host "Metrics available at http://localhost:$ListenPort/metrics"
while ($listener.IsListening) {
$context = $listener.GetContext()
$request = $context.Request
$response = $context.Response
if ($request.Url.AbsolutePath -eq '/metrics') {
$metrics = Get-AllMetrics
$buffer = [System.Text.Encoding]::UTF8.GetBytes($metrics)
$response.ContentType = 'text/plain; version=0.0.4; charset=utf-8'
}
else {
$html = @"
<!DOCTYPE html>
<html>
<head><title>Windows Scheduled Task Exporter v1.0</title></head>
<body>
<h1>Windows Scheduled Task Exporter v1.0</h1>
<p><a href="/metrics">Metrics</a></p>
<h2>Metrics</h2>
<ul>
<li>Task state (Ready, Running, Disabled, Queued)</li>
<li>Last result code, last run time, next run time</li>
<li>Missed runs, enabled status</li>
<li>Total, failed, disabled, and running task counts</li>
</ul>
</body>
</html>
"@
$buffer = [System.Text.Encoding]::UTF8.GetBytes($html)
$response.ContentType = 'text/html; charset=utf-8'
}
$response.ContentLength64 = $buffer.Length
$response.OutputStream.Write($buffer, 0, $buffer.Length)
$response.OutputStream.Close()
}
}
catch {
Write-Error "HTTP server error: $_"
Write-Error "If access denied, run: netsh http add urlacl url=http://+:$ListenPort/ user=Everyone"
}
finally {
if ($listener.IsListening) {
$listener.Stop()
}
}
}
# ============================================================================
# MAIN EXECUTION
# ============================================================================
switch ($Mode) {
'http' {
Start-HttpServer -ListenPort $Port
}
'textfile' {
$OutputFile = Join-Path $TextfileDir 'windows_scheduled_task.prom'
$outputDir = Split-Path $OutputFile -Parent
if (-not (Test-Path $outputDir)) {
New-Item -Path $outputDir -ItemType Directory -Force | Out-Null
}
$tempFile = Join-Path $outputDir ".windows_scheduled_task_metrics.$PID.tmp"
try {
$metrics = Get-AllMetrics
$metrics | Out-File -FilePath $tempFile -Encoding utf8 -NoNewline
$lineCount = ($metrics -split "`n").Count
if ($lineCount -lt 10) {
Remove-Item -Path $tempFile -Force -ErrorAction SilentlyContinue
Write-Error "Metrics file too small ($lineCount lines), keeping previous"
exit 1
}
Move-Item -Path $tempFile -Destination $OutputFile -Force
Write-Host "Metrics written to $OutputFile ($lineCount lines)" -ForegroundColor Green
}
catch {
Remove-Item -Path $tempFile -Force -ErrorAction SilentlyContinue
Write-Error "Failed to generate metrics: $_"
exit 1
}
}
default {
Get-AllMetrics | Write-Output
}
}