Hits is how many results this leg returned, counted BEFORE fusion, so it is not the number that survived into Fusion.Hits — fusion merges what both legs found and the caller's limit and offset then page it. 0 for a leg that did not run.
Name is which leg this reports: "index", the lexical store, "vector", the semantic one, or "code", the org's own repositories. Match.Backend uses the same three names.
Status is one of ok, degraded, disabled, skipped — four distinct operational facts that are never collapsed. It ran and answered; it is configured and FAILED (Error says how, and only this one is a fault); this deployment never provisioned it; or the request's mode excluded it.
TookMS is how long this leg took, in milliseconds, timed around its own call and excluding fusion. 0 for a leg that was skipped or is disabled, since nothing was called.