Powershell script to delete multiple devices from PRTG where a name and/or message text is partially matched and where the device is paused and has been paused for longer than x days. The script uses -whatif and -confirm for use with the deletion step.

Remove-PRTGPausedDevices.ps1

[CmdletBinding(SupportsShouldProcess = $true,ConfirmImpact='High')]
Param(
    $PRTGURL = "https://{your PRTG URL}/api",
    $Auth = "username={your PRTG user}&passhash={your PRTG password hash}",
    $Name = "",
    $Message = "",
    [int]$DaysPaused = 7 #Use -1 to filter for where date is unknown and 0 to return all
)

$Devices = $null
$Devices = (Invoke-RestMethod "$PRTGURL/table.json?content=devices&output=json&columns=objid,device,status_raw,message&count=99999&$Auth").devices
$Devices = $Devices | Where-Object {($_.status_raw -eq 7) -and ($_.device -notlike "*Template*")}
    
#Filtering list based on provided parameters
If ($Name -ne "")       { $Devices = $Devices | Where-Object {$_.device -like "*$Name*"} }
If ($Message -ne "")    { $Devices = $Devices | Where-Object {$_.message -like "*$Message*"} }
    
$Devices | ForEach-Object {

    $DatePaused = ($_.message | Select-String -Pattern "(?<=Paused at )(.*?)(?= by)" -AllMatches | % { $_.Matches } | % { $_.Value })
    If ($DatePaused) { $DatePaused = [DateTime]::Parse($DatePaused,([Globalization.CultureInfo]::CreateSpecificCulture("$((get-culture).name)"))) }
    $_ | Add-Member –MemberType NoteProperty –Name "paused" –Value $DatePaused -Force
}

If ($DaysPaused -gt 0)  { $Devices = $Devices | Where-Object {($_.paused -lt $(get-date).adddays(-$DaysPaused)) -and ($_.paused -is [System.DateTime])} }
If ($DaysPaused -eq -1) { $Devices = $Devices | Where-Object {$_.paused -isnot [System.DateTime]} }

#Remove HTML from Messages
$Devices | ForEach-Object {$_.message = $_.message -replace '<[^>]+>',''}

#Output list of devices and total to console to assist confirmation
$Devices | Select device, paused, message | Sort paused | FT
Write-Warning "$($Devices.Count) devices will be deleted."

$i = 1
$Devices | ForEach-Object {
        
    If ($PSCmdlet.ShouldProcess("$($_.device)","PRTG: Delete Object"))
    {
        Write-Progress -Activity "Deleting $($_.device)" -Status "$i of $($Devices.Count)" -PercentComplete ($i/($Devices.Count)*100)
        $Delete = Invoke-RestMethod "$PRTGURL/deleteobject.htm?id=$($_.objid)&approve=1&$Auth"
    }
    $i++
}