code: def mark_process_dead(pid, path=None):
      
      if path is None:
          path = os.environ.get('prometheus_multiproc_dir')
      for f in glob.glob(os.path.join(path, 'gauge_livesum_{0}.db'.format(pid))):
          os.remove(f)
      for f in glob.glob(os.path.join(path, 'gauge_liveall_{0}.db'.format(pid))):
          os.remove(f)
docs: Do bookkeeping for when one process dies in a multi-process setup.