Program.cs

using System.Net;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.ApplicationInsights;
using Notifier.Common.Extensions;
using Notifier.Common.Settings;

namespace Notifier.WebApi
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureAppConfiguration((hostBuilderContext, builder) =>
                {
                    // Add configuration file, environment variables and command line arguments
                    builder
                        .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                        .AddUserSecrets(typeof(Program).Assembly, false)
                        .AddEnvironmentVariables()
                        .AddCommandLine(args);
                })
                .ConfigureLogging((context, builder) =>
                {
                    builder.AddConfiguration(context.Configuration.GetSection(nameof(LoggingSettings)));
                    builder.AddConsole();
                    builder.AddFilter<ApplicationInsightsLoggerProvider>(
                        "", 
                        Microsoft.Extensions.Logging.LogLevel.Information); // this will capture Info level traces and above.
                })
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    // Configure kestrel web server and call startup.
                    webBuilder
                        .ConfigureKestrel(serverOptions =>
                        {
                            serverOptions.Listen(IPAddress.Any, 8080);
                            // Needed because of using newtonsoft json
                            // (else there are performance issues in .net core 3)
                            serverOptions.AllowSynchronousIO = true;
                        })
                        .UseStartup<Startup>();
                });
    }
}