A band-shell recommender's new candidate should see a copy of live traffic without replacing the current production variant. The Domain 2 job is to compare those two performances. What should they compare?
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Short Explanation
The band-shell candidate should see a copy of live traffic without replacing production. Compare shadow-variant metrics to production-variant metrics. Replacing production skips the compare, endpoint topology is Domain 3, and Model Monitor drift is Domain 4.
Full Explanation
A shadow variant receives a copy of live traffic without replacing production, so Domain 2 compares the two variants' metrics. Replacing production immediately skips that compare. Endpoint topology is Domain 3, and Model Monitor drift is Domain 4.