public static IAppBuilder ConfigureSerilog(this IAppBuilder app, HttpConfiguration config)
        {
            config.Services.Add(typeof(IExceptionLogger), new SerilogExceptionLogger());

            var assembly = typeof(SerilogConfig).Assembly.GetName();
            var configurationProvider = new ConfigurationProvider(AppSettingKey.Prefix);
            var logEventLevel = configurationProvider.Get(AppSettingKey.SerilogLoggingLevel, LogEventLevel.Error);
            const string logFileName = "talentsearch-api.json";
            var logFilePath = Path.Combine(configurationProvider.Get(AppSettingKey.SerilogFilePath), logFileName);

            var serilog = new LoggerConfiguration()
                .MinimumLevel.Debug()
                .WriteTo.Sink(new RollingFileSink(
                    logFilePath,
                    textFormatter: new JsonFormatter(renderMessage: true),
                    fileSizeLimitBytes: 100000000,
                    retainedFileCountLimit: 14), logEventLevel)
                .Enrich.WithMachineName()
                .Enrich.With<StructuredExceptionEnricher>()
                .Enrich.WithProperty("ApplicationName", assembly.Name)
                .Enrich.WithProperty("ApplicationVersion", assembly.Version)
                .Enrich.WithProperty("UserName", Environment.UserName)
                .Enrich.WithProperty("AppDomain", AppDomain.CurrentDomain)
                .Enrich.WithProperty("RuntimeVersion", Environment.Version)
                // this ensures that calls to LogContext.PushProperty will cause the logger to be enriched
                .Enrich.FromLogContext();

            if (Environment.UserInteractive || Environment.OSVersion.Platform == PlatformID.Unix)
            {
                serilog = serilog.WriteTo.ColoredConsole(logEventLevel);
            }

            Log.Logger = serilog.CreateLogger();
            app.SetLoggerFactory(new Serilog.Extras.MSOwin.LoggerFactory(Log.Logger));
            app.UseSerilogRequestContext();
            Log.Debug("Owin_Startup");
            return app;
        }