Github user justinleet commented on the issue:
https://github.com/apache/metron/pull/577
I removed the Apache header from the checkstyle.xml, because after research
Checkstyle is LGPL and I don't even want to be in the questionable space of
adding Apache headers to their config files (even though I've seen other
projects do this). Including this is fine since it's just in our build tools,
not part of our releases.
To reflect this, an exception for checkstyle.xml on the RAT check has been
added.
Let me know if this is the incorrect strategy for handling this, and I'll
update appropriately.
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