This can be a subset of the broader cienaCesPmAlertTcaStats list depending on the active scheme, so comparing the two bitmaps tells the admin whether the current scheme is narrowing focus down to just one statistic even though several are being collected for the instance. For example, cienaCesPmAlertTcaStats might have both max and average bits set, while this watermark bitmap shows only the max bit, confirming the scheme picks the single highest reading.