Serilog asp.net核心appsettings配置syslog

我正在尝试使用ASP.NET Core Web应用程序中的appsettings.json配置文件配置Serilog . 我设法让RollingFile配置部分工作，但我也试图将日志信息发送到另一个在线日志工具（例如logentries或papertrail）

我安装了以下nuget包：

Serilog.AspNetCore
Serilog.Settings.Configuration
Serilog.Sinks.Async
Serilog.Sinks.RollingFile
Serilog.Sinks.SyslogMessages

然后我将以下配置放在appsettings.json文件中：

"Serilog": {
  "Using": [ "Serilog.Sinks.Async", "Serilog.Sinks.Syslog", "Serilog.Sinks.RollingFile" ],
  "MinimumLevel": {
    "Default": "Information",
    "Override": {
      "Microsoft": "Warning",
      "System": "Error"
    }
  },
  "WriteTo": [
    {
      "Name": "Async",
      "Args": {
        "configure": [
          {
            "Name": "RollingFile",
            "Args": {
              "outputTemplate": "[{Timestamp:MMM dd HH:mm:ss}] {Level:u3} {Message:lj} <s:{SourceContext}>{NewLine}{Exception}",
              "pathFormat": "C:\\LogFiles\\Application\\{Date}.log",
              "fileSizeLimitBytes": 5000000,
              "retainedFileCountLimit": null
            }
          },
          {
            "Name": "Syslog",
            "Args": {
              "outputTemplate": "[{Timestamp:HH:mm:ss} {Level:u3}] {Message:lj} <s:{SourceContext}>{NewLine}{Exception}",
              "host": "logs.papertrailapp.com",
              "port": 12345,
              "format": "RFC5424",
              "secureProtocols": "SecureProtocols.None",
              "appName": "Application",
              "facility": "Local7"
            }
          }
        ]
      }
    }
  ]
}

我设置 Logger 的C＃代码是：

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

    Log.Logger =
        new LoggerConfiguration()
            .ReadFrom.Configuration(configuration)
            .CreateLogger();

    try
    {
        Log.Information("Starting web host");
        CreateWebHostBuilder(args).Build().Run();
    }
    catch (Exception exception)
    {
        Log.Fatal(exception, "Host terminated unexpectedly");
        throw;
    }
    finally
    {
        Log.CloseAndFlush();
    }
}

我错过了Syslog配置块中的内容吗？