DocumentDB Trace listener - azure-cosmosdb

Question

I'm trying register DocumentDB tracing with an existing listener. The code snippet below properly traces a single message to my expected listener but not the actual traces generated by the DocumentDB C# client. Am I missing something?
Snippet from Global.asax:
private static TraceSource DocDBSource;
private static TraceListener ExistingListener = new .....;
public void RegisterDocDBListener() {
DocDBSource = new TraceSource("DocDBTrace");
DocDBSource.Switch.Level = SourceLevels.Information;
DocDBSource.Listeners.Add(ExistingListener);
DocDBSource.TraceInformation("DocDB tracing initialized");
}

Answer 1

According to your description, I have checked the DefaultTrace from DocumentDB client library for .NET as follows:
For Client-side Logging with the .NET DocumentDB Client Library, you could configure the system.diagnostics configuration as follows to collect and persist documentdb log messages to a text file as follows:
<system.diagnostics>
<sources>
<source name="DocDBTrace">
<listeners>
<!--ConsoleTraceListener-->
<add name="configConsoleListener" type="System.Diagnostics.ConsoleTraceListener"/>
<!--TextWriterTraceListener-->
<add name="myListener"
type="System.Diagnostics.TextWriterTraceListener"
initializeData="TextWriterOutput.log" />
</listeners>
</source>
</sources>
<switches>
<add name="ClientSwitch" value="Warning"/>
</switches>
</system.diagnostics>
Note: The default Log Level is Information, you could change the ClientSwitch to your expected Log Level (Off, Error, Information, Verbose).
Result
Console Application
Web Application