def __init__(self, reporter, socket_addr=_DEFAULT_IPC):
super(RegistryAggregator, self).__init__()<EOL>self.socket_addr = socket_addr<EOL>self.reporter = reporter<EOL>self.process = None<EOL>
Constructs a metrics registry aggregator.

        The ``registry`` field on the ``reporter`` argument will be reset to an implementation instance prior to
        calling ``start()``. Any previously set registry is not guaranteed to be used.

        :param reporter: the reporter to use
        :param socket_addr: the 0MQ socket address; has to be the same as corresponding proxies'