Program.cs

// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

using OpenTelemetry;
using OpenTelemetry.Metrics;

public class Program
{
    public static void Main()
    {
        using var meterProvider = Sdk.CreateMeterProviderBuilder()
            .AddRuntimeInstrumentation()
            .AddPrometheusHttpListener()
            .Build();

        // Most of the process.runtime.dotnet.gc.* metrics are only available after the GC finished at least one collection.
        GC.Collect(1);

        // The process.runtime.dotnet.exception.count metrics are only available after an exception has been thrown post OpenTelemetry.Instrumentation.Runtime initialization.
        try
        {
            throw new Exception("Oops!");
        }
        catch (Exception)
        {
            // swallow the exception
        }

        Console.WriteLine(".NET Runtime metrics are available at http://localhost:9464/metrics, press any key to exit...");
        Console.ReadKey(false);
    }
}