OpenTelemetry.Sample

目前找到最簡易的方式

Example: Use OpenTelemetry with OTLP and the standalone Aspire Dashboard - .NET | Microsoft Learn

使用環境：net6

開始使用

安裝套件

<PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.9.0"/>
<PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.9.0"/>
<PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.9.0"/>
<PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.9.0"/>

Program.cs

var greeterMeter = new Meter("OTel.Example", "1.0.0");
var countGreetings = greeterMeter.CreateCounter<int>("greetings.count", description: "Counts the number of greetings");

// Custom ActivitySource for the application
var greeterActivitySource = new ActivitySource("OTel.Example");

//[Opentelemetry]
// Setup logging to be exported via OpenTelemetry
builder.Logging.AddOpenTelemetry(logging =>
{
    logging.IncludeFormattedMessage = true;
    logging.IncludeScopes = true;
});

var otel = builder.Services.AddOpenTelemetry();

// Add Metrics for ASP.NET Core and our custom metrics and export via OTLP
otel.WithMetrics(metrics =>
{
    // Metrics provider from OpenTelemetry
    metrics.AddAspNetCoreInstrumentation();
    //Our custom metrics
    metrics.AddMeter(greeterMeter.Name);
    // Metrics provides by ASP.NET Core in .NET 8
    metrics.AddMeter("Microsoft.AspNetCore.Hosting");
    metrics.AddMeter("Microsoft.AspNetCore.Server.Kestrel");
});

// Add Tracing for ASP.NET Core and our custom ActivitySource and export via OTLP
otel.WithTracing(tracing =>
{
    tracing.AddAspNetCoreInstrumentation();
    tracing.AddHttpClientInstrumentation();
    tracing.AddSource(greeterActivitySource.Name);
});

// Export OpenTelemetry data via OTLP, using env vars for the configuration
var OtlpEndpoint = builder.Configuration["OTEL_EXPORTER_OTLP_ENDPOINT"];
if (OtlpEndpoint != null)
{
    otel.UseOtlpExporter();
}

備註：net8 可以直接使用 aspire.ServiceDefault