Github user nickwallen commented on the issue: https://github.com/apache/metron/pull/644 @justinleet Another thing I noticed while in the code is that a lookup of a private IP address is expected to return an empty map. Since we're using an Optional, wouldn't it make more sense for it to return `Optional.empty()`? The javadocs say that `Optional.empty()` indicates a lookup miss, not an empty map. I could either make it return `Optional.empty()` or I could update the docs so that they match current behavior. Let me know what you think. Thanks
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