Anyone know of a way to monitor for SNapshot age on a Hyper-V machine?

I'm working on the same and already have some scripts in place.

Auto discovery script:

$hostname = '##SYSTEM.HOSTNAME##';

Invoke-Command -ComputerName $hostname -ScriptBlock { 
$vms = Get-VM | Where-Object {$_.State -eq 'Running'}

foreach ($vm in $vms) 
{
    $snapshots = Get-VMSnapshot -VMName $vm.Name
        foreach ($snapshot in $snapshots) {
                    $VMName       = $vm.Name
                    $SnapshotName = $snapshot.Name
                 # write out the instance data
                Write-Host "$VMName##$SnapShotName";
        }
}
}

# return with a response code that indicates we ran successfully
Exit 0;

Monitoring script:

$hostname = '##SYSTEM.HOSTNAME##';

Invoke-Command -ComputerName $hostname -ScriptBlock { 

$vms = Get-VM | Where-Object {$_.State -eq 'Running'}
$currentDate = Get-Date

foreach ($vm in $vms) 
{
    $snapshots = Get-VMSnapshot -VMName $vm.Name
        foreach ($snapshot in $snapshots) {
            $snapshotAge = ($currentDate - $snapshot.CreationTime).Days
                    $VMName       = $vm.Name
                    $SnapshotName = $snapshot.Name
                    $CreationTime = $snapshot.CreationTime
                    $AgeInDays    = $snapshotAge            
    # write out the instance data                
    Write-Host "SnapshotName=${SnapshotName}";
    Write-Host "VMName=${VMName}";
    Write-Host "CreationTime=${CreationTime}";
    Write-Host "AgeInDays=${AgeInDays}";            
 }
}
}

# return with a response code that indicates we ran successfully
Exit 0;

However this doesn't seem to work. What am I missing?

I also struggle to get the snapshots grouped per VM. The group method is regular expression with Parameters = useValue="value" dynamicGroup="\w+". Why doesn't this work?