NiFi

Apache NiFi provides data flow routing, transformation, and system mediation.

Federation C2 is not NiFi. The sentinel yield loop is a Signals-owned C2 HTTP server plus Engine/Yield gRPC. NiFi+canvas is an optional later K8s fielding for OTel wiring — not folded into signals-ui, not required for YK to end a sentinel Application. See Sentinel Applications and Yield.