Program.cs

using System.IO;
using System.Linq;
using System.Reflection;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;

namespace m2m_api
{
    public static class Program
    {
        private static string GetCustomAttributeFromAssembly(string key)
        {
            return Assembly.GetExecutingAssembly().CustomAttributes.Where(c => c.ConstructorArguments.Count >= 2 && c.ConstructorArguments[0].Value as string == key).Select(c => c.ConstructorArguments[1].Value as string).FirstOrDefault();
        }

        public static void Main(string[] args)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json", true, true)
                .AddEnvironmentVariables();
            var configuration = builder.Build();

            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                    if (!string.IsNullOrEmpty(configuration["Sentry:DSN"]))
                    {
                        webBuilder.UseSentry(options =>
                        {
                            options.Release = GetCustomAttributeFromAssembly("GitHash");
                            if (string.IsNullOrEmpty(options.Release))
                            {
                                options.Release = "n/a";
                            }
                            options.Dsn = configuration["Sentry:DSN"];
                            options.Environment = configuration.GetSection("KeyStorage:BlobName")?.Value?.Replace(".xml", "")?.ToLower() ?? "undefined";
                        });
                    }
                })
                .Build()
                .Run();
        }
    }
}