title: What's valid as an event log data source?
body: <p>I've been fiddling with Azure Diagnostics of late, and although the purpose of the following line of code is reasonably clear, the set of valid values that I can use in place of <code>Application!*</code> isn't (taken from <a href="http://msdn.microsoft.com/en-us/library/microsoft.windowsazure.diagnostics.diagnosticmonitorconfiguration.windowseventlog.aspx" rel="nofollow">here</a>).</p>
  
  <pre><code>diagnosticConfiguration.WindowsEventLog.DataSources.Add("Application!*");
  </code></pre>
  
  <p>What's the syntax for that string, and specifically... what does the exclamation mark mean?! :)</p>