Sort Failures by Layer

Place each failure in the recommender layer where the fix should start. Data and features Retrieval Ranking Re-ranking and policy The item language field is missing for 38% of new catalog entries Relevant new items never appear in candidate logs Relevant candidates appear in logs but receive lower scores than weaker items The top ten contains six near-duplicate items from one creator The training table is 29 hours behind the event stream A co-view generator returns only popular legacy items The ranker optimizes clicks and promotes misleading thumbnails A safety filter removes fresh items because the policy map is stale

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