(author here) The 92% mentioned in this post is showing recall@10 across all 100B vectors, calculated by comparing to the global top_k.

turbopuffer will also continuously monitor production recall at the per-shard level (or on-demand with https://turbopuffer.com/docs/recall). Perhaps counterintuitively, the global recall will actually be better than the per-shard recall if each shard is asked for its own, local top_k!