code: def delete(run_uuid: str):
      metrics_key = MetricsIndex.get(run_uuid)
      preferences_key = MetricsPreferencesIndex.get(run_uuid)
  
      if metrics_key:
          m: MetricsModel = metrics_key.load()
          MetricsIndex.delete(run_uuid)
          m.delete()
  
      if preferences_key:
          mp: MetricsPreferencesModel = preferences_key.load()
          MetricsPreferencesIndex.delete(run_uuid)
          mp.delete()
  
imports: from typing import Dict, Any, List, Optional
  from fastapi import Request
  from fastapi.responses import JSONResponse
  from labml_db import Model, Index, load_keys
  from labml_db.serializer.pickle import PickleSerializer
  from labml_db.serializer.yaml import YamlSerializer
  from labml_app.logger import logger
  from labml_app import utils
  from labml_app.enums import INDICATORS
  from .distributed_metrics import get_merged_dist_metrics_tracking, set_merged_metrics_preferences, get_merged_metrics_preferences
  from ..analysis import Analysis
  from ..series import SeriesModel, Series
  from ..series_collection import SeriesCollection
  from ..preferences import Preferences
  from labml_app.settings import INDICATOR_LIMIT
  from ...db import run
label_desc: Use image node_id 6 for calling the MetricsAnalysis obj's underlying member method code with example usage: obj.delete(run_uuid) without return types