Return whether the request latency of the master instance is greater
        than the acceptable threshold

def isMasterReqLatencyTooHigh(self):
        """
        Return whether the request latency of the master instance is greater
        than the acceptable threshold
        """
        # TODO for now, view_change procedure can take more that 15 minutes
        # (5 minutes for catchup and 10 minutes for primary's answer).
        # Therefore, view_change triggering by max latency is not indicative now.

        r = self.masterReqLatencyTooHigh or \
            next(((key, lat) for key, lat in self.masterReqLatencies.items() if
                  lat > self.Lambda), None)
        if r:
            logger.display("{}{} found master's latency {} to be higher than the threshold for request {}.".
                           format(MONITORING_PREFIX, self, r[1], r[0]))
        else:
            logger.trace("{} found master's latency to be lower than the "
                         "threshold for all requests.".format(self))
        return r