OpenTelemetry: context propagation and semconv update (#262)

samples/AspNetCoreSseServer/Program.cs

@@ -1,10 +1,23 @@
 using TestServerWithHosting.Tools;
+using OpenTelemetry.Metrics;
+using OpenTelemetry.Trace;
+using OpenTelemetry;
 
 var builder = WebApplication.CreateBuilder(args);
 builder.Services.AddMcpServer()
     .WithTools<EchoTool>()
     .WithTools<SampleLlmTool>();
 
+builder.Services.AddOpenTelemetry()
+    .WithTracing(b => b.AddSource("*")
+        .AddAspNetCoreInstrumentation()
+        .AddHttpClientInstrumentation())
+    .WithMetrics(b => b.AddMeter("*")
+        .AddAspNetCoreInstrumentation()
+        .AddHttpClientInstrumentation())
+    .WithLogging()
+    .UseOtlpExporter();
+
 var app = builder.Build();
 
 app.MapMcp();