new_contents: import secrets
  from pathlib import Path
  
  import objgraph
  
  from mitmproxy import certs
  
  if __name__ == "__main__":
      store = certs.CertStore.from_store(path=Path("~/.mitmproxy/").expanduser(), basename="mitmproxy", key_size=2048)
      store.STORE_CAP = 5
  
      for _ in range(5):
          store.get_cert(commonname=secrets.token_hex(16).encode(), sans=[], organization=None)
  
      objgraph.show_growth()
  
      for _ in range(20):
          store.get_cert(commonname=secrets.token_hex(16).encode(), sans=[], organization=None)
  
      print("====")
      objgraph.show_growth()
  
subject: add memory leak detect script for certificate generation, refs #4368