code: def _log_langfuse_v1(
      self,
      user_id,
      metadata,
      output,
      start_time,
      end_time,
      kwargs,
      optional_params,
      input,
      response_obj,
  ):
      from langfuse.model import CreateTrace, CreateGeneration
  
      print(
          "Please upgrade langfuse to v2.0.0 or higher: https://github.com/langfuse/langfuse-python/releases/tag/v2.0.1"
      )
  
      trace = self.Langfuse.trace(
          CreateTrace(
              name=metadata.get(
                  "generation_name", "litellm-completion"
              ),
              input=input,
              output=output,
              userId=user_id,
          )
      )
  
      trace.generation(
          CreateGeneration(
              name=metadata.get(
                  "generation_name", "litellm-completion"
              ),
              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 4 for calling the LangFuseLogger obj's underlying member method code with example usage: obj._log_langfuse_v1(user_id, metadata, output, start_time, end_time, kwargs, optional_params, input, response_obj) without return types