public HomeController(ILogger<HomeController> logger)
    {
        _logger = logger;
    }

    public IActionResult Index()
    {
        _logger.LogInformation("=========================================");
        _logger.LogError("=========================================");
        return View();
    }

{
  "Logging": {
    "LogLevel": {
      "Default": "Debug",
      "System": "Error",
      "Microsoft": "Error"
    }
  }
}

public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>();