106 lines
4.1 KiB
Markdown
106 lines
4.1 KiB
Markdown
# Getting Started with OpenTelemetry .NET Traces in 5 Minutes - ASP.NET Core Application
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First, download and install the [.NET
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SDK](https://dotnet.microsoft.com/download) on your computer.
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Create a new web application:
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```sh
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dotnet new web -o aspnetcoreapp
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cd aspnetcoreapp
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```
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Install the
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[OpenTelemetry.Exporter.Console](../../../src/OpenTelemetry.Exporter.Console/README.md),
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[OpenTelemetry.Extensions.Hosting](../../../src/OpenTelemetry.Extensions.Hosting/README.md),
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and
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[OpenTelemetry.Instrumentation.AspNetCore](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/tree/main/src/OpenTelemetry.Instrumentation.AspNetCore/README.md)
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packages:
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```sh
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dotnet add package OpenTelemetry.Exporter.Console
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dotnet add package OpenTelemetry.Extensions.Hosting
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dotnet add package OpenTelemetry.Instrumentation.AspNetCore
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```
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Update the `Program.cs` file with the code from [Program.cs](./Program.cs).
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Run the application again (using `dotnet run`) and then browse to the url shown
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in the console for your application (ex `http://localhost:5154`). You should see
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the trace output from the console.
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```text
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Activity.TraceId: c28f7b480d5c7dfc30cfbd80ad29028d
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Activity.SpanId: 27e478bbf9fdec10
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Activity.TraceFlags: Recorded
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Activity.ActivitySourceName: Microsoft.AspNetCore
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Activity.DisplayName: GET /
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Activity.Kind: Server
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Activity.StartTime: 2024-07-04T13:03:37.3318740Z
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Activity.Duration: 00:00:00.3693734
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Activity.Tags:
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server.address: localhost
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server.port: 5154
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http.request.method: GET
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url.scheme: https
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url.path: /
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network.protocol.version: 2
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user_agent.original: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
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http.route: /
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http.response.status_code: 200
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Resource associated with Activity:
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service.name: getting-started-aspnetcore
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service.instance.id: a388466b-4969-4bb0-ad96-8f39527fa66b
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telemetry.sdk.name: opentelemetry
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telemetry.sdk.language: dotnet
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telemetry.sdk.version: 1.9.0
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```
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Congratulations! You are now collecting traces using OpenTelemetry.
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What does the above program do?
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The program uses the
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[OpenTelemetry.Instrumentation.AspNetCore](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/tree/main/src/OpenTelemetry.Instrumentation.AspNetCore/README.md)
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package to automatically create traces for incoming ASP.NET Core requests and
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uses the
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[OpenTelemetry.Exporter.Console](../../../src/OpenTelemetry.Exporter.Console/README.md)
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package to write traces to the console. This is done by configuring an
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OpenTelemetry [TracerProvider](../customizing-the-sdk/README.MD#tracerprovider)
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using extension methods and setting it to auto-start when the host is started:
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```csharp
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builder.Services.AddOpenTelemetry()
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.ConfigureResource(resource => resource
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.AddService(serviceName: builder.Environment.ApplicationName))
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.WithTracing(tracing => tracing
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.AddAspNetCoreInstrumentation()
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.AddConsoleExporter());
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```
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> [!NOTE]
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> The `AddOpenTelemetry` extension is part of the
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[OpenTelemetry.Extensions.Hosting](../../../src/OpenTelemetry.Extensions.Hosting/README.md)
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package.
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The index route ("/") is set up to write out the OpenTelemetry trace information
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on the response:
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```csharp
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app.MapGet("/", () => $"Hello World! OpenTelemetry Trace: {Activity.Current?.Id}");
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```
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In OpenTelemetry .NET the [Activity
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class](https://learn.microsoft.com/dotnet/api/system.diagnostics.activity?view=net-7.0)
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represents the OpenTelemetry Specification
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[Span](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/api.md#span).
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For more details about how the OpenTelemetry Specification is implemented in
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.NET see: [Introduction to OpenTelemetry .NET Tracing
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API](https://github.com/open-telemetry/opentelemetry-dotnet/tree/main/src/OpenTelemetry.Api#introduction-to-opentelemetry-net-tracing-api).
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## Learn more
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* [Getting Started with Jaeger](../getting-started-jaeger/README.md)
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* [Customizing OpenTelemetry .NET SDK](../customizing-the-sdk/README.md)
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* [Extending the OpenTelemetry .NET SDK](../extending-the-sdk/README.md)
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