class_docstr: Pseudo-inform rate.
code: def handle_sys_utt(
      self, message: Message, prefix_stripped_text: str
  ) -> Optional[Dict[str, Metric]]:
      count = 0
      for val in self.api_resp_slots.values():
          if val in prefix_stripped_text:
              count += 1
      result = {"pseudo_inform_allSysTurns": AverageMetric(count)}
      if len(self.api_resp_slots) > 0:
          result["pseudo_inform_postApiRespSysTurns"] = AverageMetric(
              count
          )
      return result
  
imports: from parlai.core.message import Message
  from parlai.core.metrics import Metric, AverageMetric, normalize_answer, BleuMetric, SumMetric
  from parlai.core.tod.tod_core import STANDARD_API_NAME_SLOT, STANDARD_REQUIRED_KEY, STANDARD_OPTIONAL_KEY, STANDARD_API_SCHEMAS
  from typing import Dict, List, Optional, Tuple
  from parlai.core.tod.world_metrics_handlers import TodMetricsHandler, register_metrics_handler, _ApiCallGoalInteractionHelper, goals_hit_helper
label_desc: Use image node_id 3 for calling the PseudoInformMetricsHandler obj's underlying member method code with example usage: obj.handle_sys_utt(message, prefix_stripped_text) and returns: result