Github user simonellistonball commented on the issue:
https://github.com/apache/metron/pull/861
Actually, to follow up on that... I have a proxy feed, and some proxy use
cases (enrichment, profile, etc). I want to keep my data clean and be explicit
about which fields I pass on, so I have a 'library' field set that means "proxy
like stuff", these are the fields I push into the output here. ---
