This field reports the number of remarked bytes received on this PM instance, exposed here as cienaCesPmBasicTxRxHistoryBinRxYellowBytes. On this Ciena CES port's PM data, the description calls this 'remarked' traffic, which in Carrier-Ethernet bandwidth-profile terms is the excess-but-tolerated traffic that exceeded the committed rate and got recolored yellow rather than being dropped outright — it's usually still delivered, just first in line to be discarded if the switch gets congested downstream; and this lives in the basic bandwidth-profile-aware PM group's history bin — a closed-out interval whose own Duration and State tell you how long it ran and whether it closed cleanly, so the number is settled rather than still being written to. For example, a link under light load might show a low but steady 2,000 remarked (yellow) bytes for this bin; it's the rate of growth, not the presence of a nonzero number, that would flag a real problem.