title: NLog with Application Insights target doesn't log custom params and exceptions
body: <p>I'm using Nlog with Application Insights as Target in a WebJobs project to log telemetry. Everything seems to be working if I log just the message like below.</p>
  
  <pre><code>_logger.Log(LogLevel.Info, "Job completed");
  </code></pre>
  
  <p>I can see the Trace Info in application insights with the message "Job completed"</p>
  
  <p>But I wanted to log some parameters along with the message like below.</p>
  
  <pre><code>_logger.Info($"Job created successfully", req.UserId, req.ReportName, jobId, searchString);
  </code></pre>
  
  <p>or like below</p>
  
  <pre><code>catch (Exception ex)
  {
      _logger.Error(ex, "Error creating the job", req.UserId, req.ReportName, searchString);
      throw;
  }
  </code></pre>
  
  <p>I'm expecting a trace in application insights containing the parameters which I passed along with the message. But I can only see the message but not any parameters or exceptions details.</p>
  
  <p>What am I missing?</p>
  
  <p>Edit:</p>
  
  <p>NLog nuget version 4.3.8 and 
  Microsoft.ApplicationInsights.NLogTarget nuget version 2.4.1</p>
  
  <p>More Code:</p>
  
  <pre><code>try
  {
      var jobId = _reportingService.RequestReport(req.ReportName, searchString).Result;
  
      _logger.Info($"Job created successfully", req.UserId, req.ReportName, jobId, searchString);
  
      var output = new RetrieveReportDataRequest()
      {
          CreationRequest = new ReportCreationRequest()
          {
              ImmutableUserId = req.UserId,
             ...
          },
          SearchParameters = searchString,
          JobId = jobId,
          Created = DateTime.UtcNow,
      };
  
      outputQueueMessage = JsonConvert.SerializeObject(output, settings);
  }
  catch (Exception ex)
  {
      log.WriteLine(ex.Message);
      _logger.Error(ex, "Error creating the job", req.UserId, req.ReportName, searchString);
      throw;
  }
  </code></pre>