This read-only counter tracks the number of ATM cells received and tagged on this leaf's VCC, where tagging is the UPC action of relabeling a cell's CLP bit (typically from CLP0 to CLP1) rather than outright discarding it, when the traffic exceeds one threshold but is still within a more lenient one. A rising tagged-cell count indicates the leaf's traffic is regularly exceeding its stricter (CLP0) contract limit and being downgraded to discard-eligible status rather than being dropped outright, a middle-ground policing outcome between pass and discard. An engineer analyzing a leaf's traffic conformance would look at cktLeafAtmInTaggedCells to see how often traffic is being downgraded rather than either passing cleanly or being discarded.