Diagnostics not working in web role for Azure SDK 2.5.1

Question

I am working with Azure SDK 2.5.1, mainly on the new designed diagnostics stuffs. However, I found I cannot get it run for my web role.
So, I created a cloud service project, added a web role. Then, I appended one Trace message at the end of Application_Start in Global.asax.cs:
Trace.TraceInformaction("Application_Start end.");
After that, I right clicked the WebRole and opened the Properties tab.
In the diagnostics config window:
General: I choose 'Custom
plan', also specified the storage account, keep the 'Disk
Quota in MB' as default '4096'
Application Logs: 'Log
level' switch to 'All',
others kept as default
Other tabs are in default config settings
After I deployed the project to cloud, I found some unexpected things:
There is no WADLogsTable exists
in Table storage. That's very strange, if I use a Worker Role, it would work as expected. So in web role, I just cannot find the Trace logging?
For the performance counters, since I am using the default config with 8 counters, I can only see 8 in WADPerformanceCountersTable table
storage. In my assumption, over time, there would be more and more values of this 8 counters transferred to this table. But it was just not happened, after several hours, it still had that 8 counter values.
I just thought the diagnostics for Web Role just crashed or not working at all. Meanwhile, I checked the logs located at "C:\Logs\Plugins\Microsoft.Azure.Diagnostics.PaaSDiagnostics\1.4.0.0\DiagnosticsPlugin.log" in
server, at the end of this file there is an exception said some diagnostics process exit:
DiagnosticsPlugin.exe Error: 0 : [4/25/2015 5:38:21 AM] System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at Microsoft.Azure.Plugins.Diagnostics.dll.PluginConfigurationSettingsProvider.LoadWadXMLConfig(String fullConfig)
DiagnosticsPlugin.exe Error: 0 : [4/25/2015 5:38:21 AM] Failed to load configuration file
DiagnosticsPlugin.exe Information: 0 : [4/25/2015 5:38:21 AM] DiagnosticPlugin.exe exit with code -105
From MSDN,
the code -105 means:
The Diagnostics plugin cannot open the Diagnostics configuration file.
This is an internal error that should only happen if the Diagnostics plugin is manually invoked, incorrectly, on the VM.
It doesn't make sense, I did nothing to the VM.
As I said above, I just did very tiny changes to the scaffold code generated by Visual Studio 2013. Did I do something wrong or it's a bug for Azure SDK 2.5?
By the way, it seems everything is ok for Worker Role.

Answer 1

Hi,
  This issue could be an internal issue, I do not have any update on this as of now. There was a similar issue due to a regression last month that has been resolved, however i dont think this issue is related.
  Please follow the below article on how to enable Diagnostics and let us know if it works.
http://azure.microsoft.com/en-in/documentation/articles/cloud-services-dotnet-diagnostics/
  I will let you know if I have any update on this issue from my side.
Regards,
Nithin Rathnakar.