Diagnose freshness problems by checking data arrival, model training, serving, and final re-ranking.
The stale slate The home feed says 'Trending today,' but 8 of 10 items are from Friday. Click-through is down 9% and support has three complaints about stale recommendations. Freshness bugs often look like low-quality recommendations, not outages. Freshness debug Events -> Features -> Model -> Serving -> Slate Check the recommender in the order data becomes user-visible. Do not retrain until you know the current data and model actually reached serving. Reflex Retrain the model and hope You isolate the first stale layer instead of changing the wrong one. Debug freshness at the earliest layer that can explain the…
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