Recommendation list scores fluctuated this morning; how do I check the feature update time?

The ranking of the product recommendation list was fluctuating up and down this morning. Operations noticed a drop in click-through rate and their first reaction was that the model was unstable again. We first checked the model version; the online artifact hadn't changed, and the A/B bucketing was normal, so the issue seemed more like the input data was changing. I extracted the request IDs from…