{
  "stage": "rolled_back",
  "message": "Model lama dipertahankan. Model baru lebih buruk secara signifikan (-22.52% weighted F1)",
  "timestamp": "2026-05-28T16:37:10.275000",
  "result": "rolled_back",
  "reason": "Model baru lebih buruk secara signifikan (-22.52% weighted F1)",
  "old_f1": 0.8788,
  "new_f1": 0.6536,
  "_reloaded": true
}