After turning on verbose logging relating to something else I relaised this output is generated from the service going down. Perhaps something needs to be logged explicitly stating the service is down?
I'm using UDP input as well, ImHO this just states that the UDP listener has stopped, which will be the case anytime log stash halts whether intentionally or not. My logstash instance seems to die from time to time due to memory exhaustion, assuming memory leaking over time causing this. But that's another story, so what you see here is just a consequence of logstash stopping/dying, not a RC.
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