def getDiscoveredMetricsKeys(self):
return tuple(self.__foundMetrcsKeySet)<EOL>
Returns a tuple of all metrics keys discovered while running HyperSearch.

        NOTE: This is an optimization so that our client may
            use this info for generating the report csv file without having
            to pre-scan all modelInfos

        Parameters:
        ----------------------------------------------------------------------
        retval:         Tuple of metrics keys discovered while running
                        HyperSearch;