Sort model signals by failure layer

Place each monitoring signal in the layer it primarily diagnoses. Data layer Model behavior Service runtime Business impact Feature table is 3 hours stale New category appears in employment_status Predicted 0.8 risk band now realizes 0.62 Share of scores above threshold jumps from 8% to 14% P99 inference latency breaches 300 ms Model server returns 5xx for 2% of requests Customer complaints about wrong declines double Human reviewers override 19% of automated decisions

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