This reports the highest total received optical power across the whole multiplexed line during the bin. Because this reading sits in a Stats-table row that resets only when explicitly cleared rather than on the fixed bin schedule, an elevated line-wide max can flag an amplifier overshoot right after a channel add/drop event, which briefly overdrives every receiver on that fiber. For example, a spike in total OTS power right after a new wavelength was provisioned on this line is consistent with the amplifier's gain loop briefly overcompensating before settling, since this row's last manual clear.