Github user trkurc commented on the pull request: https://github.com/apache/nifi/pull/91#issuecomment-149677321 just speculation, but if you have a bunch of metrics in a file from somewhere and want to post it to Riemann, a processor would be useful. Granted, when I think of people using Riemann, I think of a bunch of distributed processes all sending out live metrics/monitoring information.
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