Program.cs

using Azure.Core;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Options;
using OpenTelemetry.Metrics;
using OpenTelemetry.Resources;
using Scalar.AspNetCore;
using SampleWebApplicationSLI;
using ServiceLevelIndicators;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring the built-in OpenAPI + Scalar setup in ASP.NET Core
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddOpenApi();
builder.Services.AddProblemDetails();

// Build a resource configuration action to set service information.
Action<ResourceBuilder> configureResource = r => r.AddService(
    serviceName: "SampleWebApplicationSLI",
    serviceVersion: typeof(Program).Assembly.GetName().Version?.ToString() ?? "unknown");

builder.Services.AddOpenTelemetry()
    .ConfigureResource(configureResource)
    .WithMetrics(options =>
    {
        options.AddMeter(SampleApiMeters.MeterName);
        options.AddOtlpExporter();
    });

builder.Services.AddSingleton<SampleApiMeters>();
builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IConfigureOptions<ServiceLevelIndicatorOptions>, ConfigureServiceLevelIndicatorOptions>());
builder.Services.AddServiceLevelIndicator(options =>
{
    options.CustomerResourceId = "SampleCustomerResourceId";
    options.LocationId = ServiceLevelIndicator.CreateLocationId("public", AzureLocation.WestUS3.Name);
})
.AddMvc()
.AddHttpMethod();

var app = builder.Build();

app.MapOpenApi();
app.MapScalarApiReference();
app.UseHttpsRedirection();
app.UseServiceLevelIndicator();
app.UseAuthorization();

app.MapControllers();

app.Run();