code: def start_http_server(self, port: int, addr: str = "") -> None:
      self.prometheus_client.start_http_server(
          port=port,
          addr=addr,
          registry=self.registry,
      )
  
imports: from __future__ import annotations
  import logging
  import os
  import sys
  import typing
  from functools import partial
  from typing import TYPE_CHECKING
label_desc: Use image node_id 6 for calling the PrometheusClient obj's underlying member method code with example usage: obj.start_http_server(port, addr) without return types