# Externalize Windows Performance Counters


The [Windows Performance Counters feature](/monitoring/metrics/performance-counters.md) has been removed from the NServiceBus NuGet package. It is now available as a separate NuGet package named [NServiceBus.Metrics.PerformanceCounters](https://www.nuget.org/packages/NServiceBus.Metrics.PerformanceCounters/). The new package should be used to write to performance counters when using NServiceBus Versions 6.2 and above.


## Changed APIs

The NServiceBus Performance Counter APIs have been marked as obsolete and have one-for-one equivalents in the new `NServiceBus.Metrics.PerformanceCounters` package.

### Enabling Critical Time Counter

```csharp
// For NServiceBus version 6.x
endpointConfiguration.EnableCriticalTimePerformanceCounter();

// For Performance Counters version 1.x
var performanceCounters = endpointConfiguration.EnableWindowsPerformanceCounters();
```

### Enabling SLA Counter

```csharp
// For NServiceBus version 6.x
endpointConfiguration.EnableSLAPerformanceCounter(TimeSpan.FromMinutes(3));

// For Performance Counters version 1.x
var performanceCounters = endpointConfiguration.EnableWindowsPerformanceCounters();
performanceCounters.EnableSLAPerformanceCounters(TimeSpan.FromMinutes(3));
```

## Compatibility

The `NServiceBus.Metrics.PerformanceCounters` package is fully compatible with endpoints that use the NServiceBus package's Performance Counters functionality.