docs: def setupWorkerTransition():
      """Hook Twisted deprecation machinery to use custom warning class
      for Worker API deprecation warnings."""
  
      default_warn_method = getWarningMethod()
  
      def custom_warn_method(message, category, stacklevel):
          if stacklevel is not None:
              stacklevel += 1
          if _WORKER_WARNING_MARK in message:
              # Message contains our mark - it's Worker API Renaming warning,
              # issue it appropriately.
              message = message.replace(_WORKER_WARNING_MARK, "")
              warnings.warn(
                  DeprecatedWorkerNameWarning(message), message, stacklevel)
          else:
              # Other's warning message
              default_warn_method(message, category, stacklevel)
  
      setWarningMethod(custom_warn_method)