如何获取NLog输出以显示在Azure功能的流日志中? [英] How can I get NLog output to appear in the streaming logs for an Azure Function?

问题描述

我有一个简单的Azure功能，我希望能够在流日志窗口和Application Insights中监视日志输出.

I have a simple Azure Function and I'd like to be able to monitor log output in both the streaming log window and in Application Insights.

到目前为止，我能够在Application Insights中看到NLog输出，但在流窗口中却看不到.Microsoft ILogger输出在两者中都显示.

这是我到目前为止所做的:

Here's what I've done so far:

• 创建了基本的Azure测试功能
• 我从Azure门户启用了Application Insights
• 为该功能安装了 NLog 和 Microsoft.ApplicationInsights.NLogTarget nuget依赖项.
• 向该功能添加了代码，以编程方式创建Application Insights nlog目标.
• 在阅读完这些问题之后... 使用NLog进行Azure日志流和如何集成NLog将日志写入Azure流日志我还以编程方式添加了NLog TraceTarget，因为它们建议流日志机制仅显示跟踪输出流(不要与称为跟踪"的日志级别混淆！)

• 最后，我修改了 host.json ，将默认日志记录级别更改为"Trace".为了使流窗口显示Microsoft ILogger的跟踪级别的输出，这是必需的，而且我认为这可能是Nlog输出均未显示的原因...

• Created a basic Azure test function
• From the Azure portal, I enabled Application Insights
• Installed NLog and Microsoft.ApplicationInsights.NLogTarget nuget dependencies for the function.
• Added code to the function to programmatically create an Application Insights nlog target.
• After reading these questions... Azure Log Streaming with NLog and How to integrate NLog to write log to Azure Streaming log I have also programmatically added an NLog TraceTarget since they suggest that the streaming log mechanism only displayed the Trace ouput stream (not to be confused with the log-level called 'Trace' !)

• Finally, I have modified host.json to turn the default logging level up to "Trace". This is required in order for the streaming window to show Trace-level output for the Microsoft ILogger and I had thought it might be the reason none of the Nlog output was showing...

{
 "version": "2.0",
 "logging": {
   "logLevel": {
     "default": "Trace"
    }
  }
}

到目前为止，结果是:

• 所有Microsoft记录器输出均显示在流窗口和Application Insights日志中.
• Nlog输出 显示在Application Insights中，但否不会出现在流窗口中.

• All Microsoft logger output is shown in both the streaming window and Application Insights log.
• The Nlog output is shown in Application Insights but does NOT appear in the streaming window.

这是最终的功能代码...

Here is the final function code...

public static class Function1
{
    [FunctionName("LogTest")]
    public static void Run([TimerTrigger("0 */5 * * * *")] TimerInfo myTimer, ILogger log)
    {
        // Set up NLOG targets and logger
        var config = new LoggingConfiguration();
        //send logging to application insights     
        config.LoggingRules.Add(
          new LoggingRule("*", LogLevel.Trace, 
          new ApplicationInsightsTarget()));
        //also try to log to Trace output 
        //'RawWrite' is used to try and force output at all log-levels  
        config.LoggingRules.Add(
          new LoggingRule("*", LogLevel.Trace, 
          new TraceTarget {RawWrite = true}));

        LogManager.Configuration = config;
        var nlog = LogManager.GetLogger("Example");

        //log using native
        log.LogInformation($"log:Info"); //appears in live-stream, app-insights
        log.LogError("log:Error");       //appears in live-stream, app-insights
        log.LogTrace("log:Trace");       //appears in live-stream, app-insights (after modifying host.json)

        //log using nlog
        nlog.Info("nlog:info");          //appears in ...........  app-insights
        nlog.Error("nlog:error");        //appears in ...........  app-insights
        nlog.Trace("nlog:trace");        //appears in ...........  app-insights                     

        //say goodbye
        log.LogInformation("log:ending");
    }
}

在此先感谢您提出任何建议-毫无疑问，我缺少一些简单的步骤.

Thanks in advance for any suggestions - no doubt I'm missing some simple step.

推荐答案

感谢

Thanks to the link provided by Rolf Kristensen
it seems the solution is to configure a new rule using the MicrosoftILoggerTarget rather than the TraceTarget.

因此完整的代码是

var config = new LoggingConfiguration();
//ensure that log output is seen in the Streamed Log window
config.LoggingRules.Add(new LoggingRule("*", LogLevel.Trace, 
     new MicrosoftILoggerTarget(azureLog)));
//ensure that log output is sent to Application Insights
config.LoggingRules.Add(new LoggingRule("*", LogLevel.Trace, 
     new ApplicationInsightsTarget()));
LogManager.Configuration = config;
var nlog = LogManager.GetLogger("Example");
nlog.Info("output from nlog");

其中azureLog是提供给该函数的Run方法的 ILogger .

where azureLog is the ILogger provided to the Run method of the function.

MicrosoftILoggerTarget .

这篇关于如何获取NLog输出以显示在Azure功能的流日志中?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！