Continuously sample the queue depth of a single queue on multiple servers. Handy for troubleshooting.

Get-MSMQDepth.ps1

param(
    [string[]]
    $ComputerName,

    [string]
    $QueueName,

    [int]
    $SampleRate = 5 # once every 5 seconds
)

while ($true) {

    Write-Host "Collecting sample..."

    $SampleTime = [System.DateTime]::Now

    $Results = $ComputerName | ForEach-Object {
        gwmi -Class Win32_PerfRawData_MSMQ_MSMQQueue -ComputerName $_ -Filter "Name='$_\\private$\\$($QueueName)'" 
    }

    $Results | ForEach-Object { Write-Output "$($SampleTime),$($_.PSComputerName),$($_.MessagesInQueue)" }

    $Summary = $Results | Measure-Object MessagesInQueue -Average -Minimum -Maximum
    Write-Host "Avg: $($Summary.Average), Min: $($Summary.Minimum), Max: $($Summary.Maximum)"

    Write-Host "Waiting for next sample period....Press ctrl+c to exit"
    Start-Sleep -Seconds $SampleRate
}