Mission setup
Feature streams and detector stations
Thresholds and windows
PSI compares how observations move between distribution bins. Larger values indicate stronger population shift.
Shape the production distribution
Ranked monitoring table
| Flag | Feature | Type | Train mean / mode | Production mean / mode | Missing | Drift score | Importance | Severity | Priority |
|---|
Training versus production
Feature drift scoreboard
Drift and model performance trend
Correlation change heatmap
What most likely happened?
Choose the next action
Analyst briefing
Detection performance
Analyst milestones
Metric guide and response principles
Drift does not always mean failure
A feature may move without damaging predictions. Combine distribution evidence with feature importance, model metrics, and operational context.
Small important shifts can matter
A modest change in a critical feature can outrank a large change in an unused feature. Risk weighting prevents noisy prioritization.
Investigate before retraining
Pipeline defects, schema changes, and missing values often require data repairs. Retraining on corrupted data can make the model worse.