Calling Tracer.Configure() will replace the settings for all subsequent traces, both for custom instrumentation and for automatic instrumentation.

:warning: Replacing the configuration should be done once, as early as possible in your application.

Create custom traces

To create and activate a custom span, use Tracer.Instance.StartActive(). If a trace is already active (when created by automatic instrumentation, for example), the span will be part of the current trace. If there is no current trace, a new one will be started.

:warning: Ensure you dispose of the scope returned from StartActive. Disposing the scope will close the span, and ensure the trace is flushed to Datadog once all its spans are closed.

using Datadog.Trace;

// Start a new span
using (var scope = Tracer.Instance.StartActive("custom-operation"))
{
    // Do something
}

Release Notes

You can view the notes for the latest release on GitHub.

Upgrading from 2.x to 3.0

The .NET tracer v3.0.0 includes breaking changes that you must be aware of before upgrading your applications. The most important high-level changes are listed below, and described in more detail later in this document

• Breaking changes
  • Custom-only tracing (using the Datadog.Trace NuGet package), without any automatic tracing, is no longer supported. Custom instrumentation with the Datadog.Trace NuGet where you have also configured automatic-instrumentation is still supported as it was in v2.x.x.
  • The public API surface has changed in the Datadog.Trace NuGet package. A number of previously obsolete APIs have been removed, and some other APIs have been marked obsolete. Most changes are related to how you create TracerSettings and Tracer instances.
  • Changes to default settings. The default values of some settings have changed, and others have been removed. See below for more details.
  • Changes in behavior. The semantic requirements and meaning of some settings have changed, as have some of the tags added to traces. See below for more details.
  • The 32-bit MSI installer will no longer be available. The 64-bit MSI installer already includes support for tracing 32-bit processes, so you should use this installer instead.
  • The client library will still be injected when DD_TRACE_ENABLED=0. In v2.x.x, setting DD_TRACE_ENABLED=0 would prevent the client library from being injected into the application completely. In v3.0.0+, the client library will still be injected, but tracing will be disabled.
  • Referencing the Datadog.Trace.AspNet module is no longer supported. In v1.x.x and 2.x.x ASP.NET support allowed adding a reference to the Datadog.Trace.AspNet module in your web.config. This is no longer supported in v3.x.x.
• Deprecation notices
  • .NET Core 2.1 is marked EOL in v3.0.0+ of the tracer. That means versions 2.0, 2.1, 2.2 and 3.0 of .NET Core are now EOL. These versions may still work with v3.0.0+, but they will no longer receive significant testing and you will receive limited support for issues arising with EOL versions.
  • Datadog.Trace.OpenTracing is now obsolete. OpenTracing is considered deprecated, and so Datadog.Trace.OpenTracing is considered deprecated. See the following details on future deprecation.
  • macOS 11 is no longer supported for CI Visibility in v3.0.0+. Only macOS 12 and above are supported.
• Major version policy and future deprecation
  • Announcing a major version roadmap. We intend to make yearly major releases, starting from v3.0.0 in 2024, and v4.0.0 in 2025. We clearly will aim for minimal breaking changes, with the primary focus being on maintaining support for new versions of .NET and removal of EOL frameworks and operating systems.
  • Planned removal of support for .NET Core 2.x and .NET Core 3.0 in version v4.0.0+. We intend to completely remove support for .NET Core 2.x and .NET Core 3.0 in v4.0.0. .NET Framework 4.6.1+ will continue to be supported.
  • Planned removal of support for some linux distributions. In version v4.0.0, we intend to drop support for CentOS 7, RHEL 7, and CentOS Stream 8.
  • Planned remove of support for App Analytics. In version v4.0.0, we intend to drop support for App Analytics and associated settings.

For a full list of changes and a guide to migrating your application, please see the migration guide.

Get in touch

If you have questions, feedback, or feature requests, reach our support.