I m trying to implement tracing in radosgw using jaeger, in tracing we must have jaeger tracer variable which contains `spans` which gives us the time taken by each function, and is shown in UI.

Now to make traces more readable to user I m assigning different jaeger tracer variable to different request the users make that is one jaeger tracer variable for for `swift -A http://localhost:8000/auth -U test:tester -K testing list`, 

and one for this

`swift -A http://localhost:8000/auth -U test:tester -K testing list`

and each of those tracer contains operation related spans related to that request only making it more readable in the UI.

To define a jaeger_tracer variable we need a string, so to make the string unique I m thinking of making string from command line request like `upload mycontainer file.txt` and append it with current time.

But the problem is I m not able to get command line request string is there anyway to access it in rgw_process.cc

I have access to these variables

Is there anyway I can get the command line request string from these variables or using some combination of these