Github user adamonduty commented on the pull request:
https://github.com/apache/nifi/pull/256#issuecomment-220126202
Edgardo, I was more concerned about template export. If one wants to share
how something is done in NiFi with others via a template, many users would be
surprised (or angry) if their webhook URL was exported. It isn't meant to be
shared outside of a slack team, but there is a lot of potential for that to
inadvertently occur if we don't mark it as sensitive.
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