Can't listen error info by RequestListener in Instrumenter lifecycle end

[zmapleshine]

Is your feature request related to a problem? Please describe.
I am trying to add "hasError” tag to my custom component metrics by RequestListener, but this interface has no way to transfer Throwable info to its implementation class.

At first I wanted to pass exceptions by RESPONSE, and I needed to modify the generics of the instrument class but I thought it was important to make a distinction.

/** Listener method that is called at the end of a request. */
  void end(Context context, Attributes responseAttributes);

Describe the solution you'd like

add throwable param to "end" method in interface RequestListener.

Describe alternatives you've considered

None

Additional context

None

[zmapleshine]

Maybe RequestListener interface is better called "InstrumentListener"?
And it should both pass Attributes to implementation class and support passing REQUEST/RESPONSE directly, because the data format in Attributes may not meet the requirements and needs to be resolved from the REQUEST/RESPONSE object.