code: def inject_tracing_vars(env_dict: Dict[str, str]) -> Dict[str, str]:
      return env_dict
  
file_path: metaflow/metaflow/tracing/__init__.py
imports: import sys
  from metaflow.metaflow_config import OTEL_ENDPOINT, ZIPKIN_ENDPOINT, CONSOLE_TRACE_ENABLED, DISABLE_TRACING, DEBUG_TRACING
  from functools import wraps
  import contextlib
  from typing import Dict
label_desc: Use image node_id 4 for calling a global function with example usage: inject_tracing_vars(env_dict) and returns: env_dict