Swap Samples.Telemetry to use .NET Activity (#3819)

* Swap Samples.Telemetry to use .NET Activity

* Update TransportTests snapshots

Author: bouwkast

tracer/test/snapshots/TelemetryTests.verified.txt

@@ -2,13 +2,18 @@
   {
     TraceId: Id_1,
     SpanId: Id_2,
-    Name: GetAsync,
+    Name: Samples.Telemetry.internal,
     Resource: GetAsync,
     Service: Samples.Telemetry,
+    Type: custom,
     Tags: {
       env: integration_tests,
       language: dotnet,
-      runtime-id: Guid_1,
+      otel.library.name: Samples.Telemetry,
+      otel.status_code: STATUS_CODE_UNSET,
+      otel.trace_id: Guid_1,
+      runtime-id: Guid_2,
+      span.kind: internal,
       version: 1.0.0,
       _dd.p.dm: -0
     },
@@ -34,8 +39,8 @@
       http-client-handler-type: System.Net.Http.HttpClientHandler,
       http.method: GET,
       http.status_code: 200,
-      http.url: http://localhost:00000/Guid_3/,
-      runtime-id: Guid_1,
+      http.url: http://localhost:00000/Guid_4/,
+      runtime-id: Guid_2,
       span.kind: client
     },
     Metrics: {
@@ -54,8 +59,8 @@
       env: integration_tests,
       language: dotnet,
       otel.status_code: STATUS_CODE_UNSET,
-      otel.trace_id: Guid_2,
-      runtime-id: Guid_1,
+      otel.trace_id: Guid_3,
+      runtime-id: Guid_2,
       span.kind: internal,
       version: 1.0.0,
       _dd.p.dm: -0

tracer/test/snapshots/TransportTests.verified.txt

@@ -1,32 +1,11 @@
-[
+[
   {
     TraceId: Id_1,
     SpanId: Id_2,
-    Name: GetAsync,
-    Resource: GetAsync,
-    Service: Samples.Telemetry,
-    Tags: {
-      env: integration_tests,
-      language: dotnet,
-      runtime-id: Guid_1,
-      _dd.p.dm: -0
-    },
-    Metrics: {
-      process_id: 0,
-      _dd.agent_psr: 1.0,
-      _dd.top_level: 1.0,
-      _dd.tracer_kr: 1.0,
-      _sampling_priority_v1: 1.0
-    }
-  },
-  {
-    TraceId: Id_1,
-    SpanId: Id_3,
     Name: http.request,
     Resource: GET localhost:00000/?/,
     Service: Samples.Telemetry-http-client,
     Type: http,
-    ParentId: Id_2,
     Tags: {
       component: HttpMessageHandler,
       env: integration_tests,
@@ -35,10 +14,15 @@
       http.status_code: 200,
       http.url: http://localhost:00000/Guid_2/,
       runtime-id: Guid_1,
-      span.kind: client
+      span.kind: client,
+      _dd.p.dm: -0
     },
     Metrics: {
-      _dd.top_level: 1.0
+      process_id: 0,
+      _dd.agent_psr: 1.0,
+      _dd.top_level: 1.0,
+      _dd.tracer_kr: 1.0,
+      _sampling_priority_v1: 1.0
     }
   }
 ]

tracer/test/test-applications/integrations/Samples.Telemetry/Program.cs

@@ -11,11 +11,13 @@ namespace Samples.Telemetry
 {
     internal static class Program
     {
+        private static ActivitySource _source;
         private const string ResponseContent = "PONG";
         private static readonly Encoding Utf8 = Encoding.UTF8;
 
         public static async Task Main(string[] args)
         {
+            _source = new ActivitySource("Samples.Telemetry");
 
             string port = args.FirstOrDefault(arg => arg.StartsWith("Port="))?.Split('=')[1] ?? "9000";
             Console.WriteLine($"Port {port}");
@@ -32,7 +34,7 @@ public static async Task Main(string[] args)
                 Console.WriteLine("Sending async request with default HttpClient.");
                 using (var client = new HttpClient())
                 {
-                    using (SampleHelpers.CreateScope("GetAsync"))
+                    using (_source.StartActivity("GetAsync"))
                     {
                         await client.GetAsync(url);
                         Console.WriteLine("Received response for client.GetAsync(String)");