Create NServiceBus Performance counters without the NSB Powershell DLL

CreateNSBPerfCounters.ps1

#requires -RunAsAdministrator

Function InstallNSBPerfCounters {
 
    $category = @{Name="NServiceBus"; Description="NServiceBus statistics"}
    $counters = New-Object System.Diagnostics.CounterCreationDataCollection
    $counters.AddRange(@(
        New-Object System.Diagnostics.CounterCreationData "Critical Time", "Age of the oldest message in the queue.",  NumberOfItems32
        New-Object System.Diagnostics.CounterCreationData "SLA violation countdown", "Seconds until the SLA for this endpoint is breached.",  NumberOfItems32
        New-Object System.Diagnostics.CounterCreationData "# of msgs successfully processed / sec", "The current number of messages processed successfully by the transport per second.", RateOfCountsPerSecond32
        New-Object System.Diagnostics.CounterCreationData "# of msgs pulled from the input queue /sec", "The current number of messages pulled from the input queue by the transport per second.", RateOfCountsPerSecond32
        New-Object System.Diagnostics.CounterCreationData "# of msgs failures / sec", "The current number of failed processed messages by the transport per second.", RateOfCountsPerSecond32
    ))

    $install = $false
    if ([System.Diagnostics.PerformanceCounterCategory]::Exists($category.Name)) {
        $existingCounters = ([System.Diagnostics.PerformanceCounterCategory]::GetCategories() | ? CategoryName -eq $category.Name).GetCounters() 
    
        if ($existingCounters.Count -ne $counters.Count) {
            $install = $true
        } 
        else {
            foreach ($counter in $counters) {
                $found = $existingCounters  | ? CounterName -eq $counter.CounterName | ? CounterType -eq  $counter.CounterType | ? CounterHelp -eq  $counter.CounterHelp
                if (-not $found) {
                    $install = $true
                    break
                }
            }
        }
    }
    else {
        $install = $true
    }
    
    if ($install) {
        if ([System.Diagnostics.PerformanceCounterCategory]::Exists($category.Name)) {
            [System.Diagnostics.PerformanceCounterCategory]::Delete($category.Name)
        }
        [void] [System.Diagnostics.PerformanceCounterCategory]::Create($category.Name, $category.Description, [System.Diagnostics.PerformanceCounterCategoryType]::MultiInstance, $counters)
        [System.Diagnostics.PerformanceCounter]::CloseSharedResources()
    }
}
InstallNSBPerfCounters