Water-plant turbidity features that were always populated now arrive 40 percent null, and one sensor column flipped from numeric to a status string. Invoke count and latency look fine. Which monitor detects that?

Turbidity features now arrive 40 percent null, and one column flipped from numeric to a status string. A data-quality monitor catches missingness, type, and range. Invoke count and latency stay green, and model-quality needs labels.