Github user markap14 commented on the issue:
https://github.com/apache/nifi/pull/556
@JPercivall we don't typically recommend emitting ROUTE events when routing
to failure. Often times, failure is routed back to self, if for no other reason
than to keep the data in the flow. We don't want to destroy provenance by
continually emitting ROUTE events. This event type is intended for processors
whose sole job it is to route data, such as RouteOnAttribute, RouteContent,
RouteText, etc.
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