docs/core/diagnostics/snippets/OTLP-Example/csharp/Program.cs - main - aprogrammer/dotnet-docs

docs/core/diagnostics/snippets/OTLP-Example/csharp/Program.cs
139 строк4 KB
Sam Spencer
Fixes from reviewing the content previews
23 авг 2024, 01:47
23 авг 2024, 01:47f41e96e
// <WholeProgram>
using System.Diagnostics;
using System.Diagnostics.Metrics;
using OpenTelemetry.Metrics;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;
using OpenTelemetry.Exporter;
using OpenTelemetry.Logs;
using OpenTelemetry;
using Azure.Monitor.OpenTelemetry.AspNetCore;

var builder = WebApplication.CreateBuilder(args);

// <Snippet_CustomMetrics>
// Custom metrics for the application
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");
// </Snippet_CustomMetrics>
// <Snippet_HttpClientFactory>
builder.Services.AddHttpClient();
// </Snippet_HttpClientFactory>

// <Snippet_OTEL>
// 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();
}
//</Snippet_OTEL>

//<Snippet_AzureMonitor>
if (!string.IsNullOrEmpty(builder.Configuration["APPLICATIONINSIGHTS_CONNECTION_STRING"]))
{
    otel.UseAzureMonitor();
}
//</Snippet_AzureMonitor>


var app = builder.Build();

//<Snippet_MapGet>
app.MapGet("/", SendGreeting);
//</Snippet_MapGet>

//<Snippet_MapNested>
app.MapGet("/NestedGreeting", SendNestedGreeting);
//</Snippet_MapNested>

app.Run();

//<Snippet_SendGreeting>
async Task<String> SendGreeting(ILogger<Program> logger)
{
    // Create a new Activity scoped to the method
    using var activity = greeterActivitySource.StartActivity("GreeterActivity");

    // Log a message
    logger.LogInformation("Sending greeting");

    // Increment the custom counter
    countGreetings.Add(1);

    // Add a tag to the Activity
    activity?.SetTag("greeting", "Hello World!");

    return "Hello World!";
}
//</Snippet_SendGreeting>

//<Snippet_SendNestedGreeting>
async Task SendNestedGreeting(int nestlevel, ILogger<Program> logger, HttpContext context, IHttpClientFactory clientFactory)
{
    // Create a new Activity scoped to the method
    using var activity = greeterActivitySource.StartActivity("GreeterActivity");

    if (nestlevel <= 5)
    {
        // Log a message
        logger.LogInformation("Sending greeting, level {nestlevel}", nestlevel);

        // Increment the custom counter
        countGreetings.Add(1);

        // Add a tag to the Activity
        activity?.SetTag("nest-level", nestlevel);

        await context.Response.WriteAsync($"Nested Greeting, level: {nestlevel}\r\n");

        if (nestlevel > 0)
        {
            var request = context.Request;
            var url = new Uri($"{request.Scheme}://{request.Host}{request.Path}?nestlevel={nestlevel - 1}");

            // Makes an http call passing the activity information as http headers
            var nestedResult = await clientFactory.CreateClient().GetStringAsync(url);
            await context.Response.WriteAsync(nestedResult);
        }
    }
    else
    {
        // Log a message
        logger.LogError("Greeting nest level {nestlevel} too high", nestlevel);
        await context.Response.WriteAsync("Nest level too high, max is 5");
    }
}
//</Snippet_SendNestedGreeting>