code: def handle_result(
      test: Test,
      result: Result,
  ) -> Optional[str]:
      test_name = test["name"]
  
      msg = ""
      success = result.status == ResultStatus.SUCCESS.value
      time_taken = result.results.get("time_taken", float("inf"))
      num_terminated = result.results.get("trial_states", {}).get(
          "TERMINATED", 0
      )
      was_smoke_test = result.results.get("smoke_test", False)
  
      if not success:
          if result.status == "timeout":
              msg += "Test timed out."
          else:
              msg += "Test script failed. "
  
      if test_name == "tune_scalability_long_running_large_checkpoints":
          last_update_diff = result.results.get(
              "last_update_diff", float("inf")
          )
          target_update_diff = 360
  
          if last_update_diff > target_update_diff:
              return (
                  f"Last update to results json was too long ago "
                  f"({last_update_diff:.2f} > {target_update_diff})"
              )
          return None
  
      elif test_name == "tune_scalability_bookkeeping_overhead":
          target_terminated = 10000
          target_time = 800
      elif test_name == "tune_scalability_durable_trainable":
          target_terminated = 16
          target_time = 650
      elif test_name == "tune_scalability_network_overhead":
          target_terminated = 100 if not was_smoke_test else 20
          target_time = 900 if not was_smoke_test else 400
      elif test_name == "tune_scalability_result_throughput_cluster":
          target_terminated = 1000
          target_time = 130
      elif (
          test_name == "tune_scalability_result_throughput_single_node"
      ):
          target_terminated = 96
          target_time = 120
      elif test_name == "tune_scalability_xgboost_sweep":
          target_terminated = 31
          target_time = 3600
      else:
          return None
  
      if num_terminated < target_terminated:
          msg += (
              f"Some trials failed "
              f"(num_terminated={num_terminated} < {target_terminated}). "
          )
      if time_taken > target_time:
          msg += (
              f"Took too long to complete "
              f"(time_taken={time_taken:.2f} > {target_time}). "
          )
  
      return msg or None
  
label_desc: Use image node_id 1 for calling a global function with example usage: handle_result(test, result) and returns: unknown, None, str, last_update_diff, str, target_update_diff, str, None