Github user justinleet commented on the issue:
https://github.com/apache/metron/pull/644
@nickwallen Off the top of my head, I think it could be Optional.empty(),
but I'd like to see a debug log added so we can easily tell the difference
between "IP not found" and "It wasn't even something we should have looked up".
Double check the logic on the function, but it should essentially be the same
thing.
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