Add OpenTelemetry extension

src/NATS.Net.OpenTelemetry/NATS.Net.OpenTelemetry.csproj

@@ -16,4 +16,12 @@
 
     </PropertyGroup>
 
+    <ItemGroup>
+        <PackageReference Include="OpenTelemetry" Version="1.6.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\NATS.Client.Core\NATS.Client.Core.csproj" />
+    </ItemGroup>
+
 </Project>

src/NATS.Net.OpenTelemetry/OpenTelemetryTracingExtensions.cs

@@ -0,0 +1,23 @@
+using NATS.Client.Core;
+
+// ReSharper disable once CheckNamespace - Place in OTEL namespace for discoverability
+namespace OpenTelemetry.Trace;
+
+public static class OpenTelemetryTracingExtensions
+{
+    /// <summary>
+    /// Enables trace collection on activity sources from the NATS.Client nuget package.
+    /// </summary>
+    /// <param name="builder"><see cref="TracerProviderBuilder"/> being configured.</param>
+    /// <param name="includeInternal">Include traces from internal messaging used for control flow and lower level usage during high level abstractions (e.g. JetStream, KvStore, etc)</param>
+    /// <returns>The same instance of <see cref="TracerProviderBuilder"/> to chain the calls.</returns>
+    public static TracerProviderBuilder AddNatsInstrumentation(this TracerProviderBuilder builder, bool includeInternal = false)
+    {
+        builder.AddSource("NATS.Client");
+
+        if (includeInternal)
+            builder.AddSource("NATS.Client.Internal");
+
+        return builder;
+    }
+}