Github user Crim commented on the issue:
https://github.com/apache/storm/pull/2136
@revans2 I've updated it to denote components starting with __ as "system"
rather than spout. It would seem like the visualization end point is
mis-reporting them as spouts when they should be something else.
Regarding the acker instances showing 0, that's also what the visualization
api end point is returning. Unfortunately my clojure isn't so great and I
wasn't able to correctly track down how these things get populated within the
end point.
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