ASP.NET Core 10: New OpenTelemetry metrics for Identity

Program.cs

builder.Services
    .AddOpenTelemetry()
    .ConfigureResource(r => r.AddService(
        serviceName: builder.Environment.ApplicationName,
        serviceVersion: "1.0.0"))
    .WithMetrics(metrics =>
    {
        // HTTP pipeline instrumentation (http.server.* etc.)
        metrics.AddAspNetCoreInstrumentation();

        // Built-in ASP.NET Core meters: hosting + routing + diagnostics + rate limiting
        metrics.AddMeter(
            "Microsoft.AspNetCore.Hosting",
            "Microsoft.AspNetCore.Server.Kestrel",
            "Microsoft.AspNetCore.Routing",
            "Microsoft.AspNetCore.Diagnostics",
            "Microsoft.AspNetCore.RateLimiting",

            // NEW Identity metrics meter in ASP.NET Core 10
            // Better end-to-end visibility: HTTP request → routing → middleware → Identity sign-in / sign-out.
            "Microsoft.AspNetCore.Identity");

        // You can also add runtime / HttpClient metrics if you want:
        // metrics.AddRuntimeInstrumentation();
        // metrics.AddHttpClientInstrumentation();

        // Example exporter: Prometheus
        metrics.AddPrometheusExporter();
    });

var app = builder.Build();