code: def _log_langfuse_v2(
      self,
      user_id,
      metadata,
      output,
      start_time,
      end_time,
      kwargs,
      optional_params,
      input,
      response_obj,
  ):
      trace = self.Langfuse.trace(
          name=metadata.get("generation_name", "litellm-completion"),
          input=input,
          output=output,
          user_id=metadata.get("trace_user_id", user_id),
          id=metadata.get("trace_id", None),
      )
  
      trace.generation(
          name=metadata.get("generation_name", "litellm-completion"),
          id=metadata.get("generation_id", None),
          startTime=start_time,
          endTime=end_time,
          model=kwargs["model"],
          modelParameters=optional_params,
          input=input,
          output=output,
          usage={
              "prompt_tokens": response_obj["usage"]["prompt_tokens"],
              "completion_tokens": response_obj["usage"][
                  "completion_tokens"
              ],
          },
          metadata=metadata,
      )
  
file_path: litellm/litellm/integrations/langfuse.py
imports: import dotenv, os
  import requests
  import requests
  from datetime import datetime
  import traceback
  from packaging.version import Version
label_desc: Use image node_id 5 for calling the LangFuseLogger obj's underlying member method code with example usage: obj._log_langfuse_v2(user_id, metadata, output, start_time, end_time, kwargs, optional_params, input, response_obj) without return types