Even though Kylo has not supported yet replay functionality of Nifi, Users still can replay event from NIFI UI or Nifi's REST APIs.
And, I think Kylo cannot keep track of status of replay event since REPLAY event is not considered as starting event type.
I think we can just include ProvenanceEventType.REPLAY in STARTING_EVENT_TYPES variable of ProvenanceEventUtil.java.
But, users might want to see some different UI for replayed job compared with normal starting job.
So, we might need additional effort on UI side as well.