code: def mock_settings_env_vars(tmp_path, monkeypatch):
      monkeypatch.setenv("PROMETHEUS_MULTIPROC_DIR", str(tmp_path))
  
imports: import pytest
  from mlflow.server.prometheus_exporter import activate_prometheus_exporter
label_desc: Use image node_id 1 for calling a global function with example usage: mock_settings_env_vars(tmp_path, monkeypatch) without return types