Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/1622
@trixpan Thanks for the PR. Everything functions correctly but behind the
scenes we were recording observers for the NONE log level because the observers
are registered according to the severity. For instance, configuring for INFO
will register an observer for INFO, WARN, ERROR, etc. The tweak I'm proposing
would be to not register an observer for NONE since that is not really a true
log level (no component will ever log a message to the NONE level). I've added
this to your commit here [1]. If your happy with this too, I'll merge to master.
Thanks!
[1]
https://github.com/mcgilman/nifi/commit/b38dc41b7ce8777d26d5394184efcc0e20c64312#diff-3d6bee4e7568e4e4034ef059df9e2b47
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