Github user brianghig commented on the pull request:
https://github.com/apache/incubator-nifi/pull/59#issuecomment-105625875
Hi Joe,
We could use filters within the Logback configuration to turn on/off
Throwables or any granularity of Exceptions. Since exceptions can be used for
more than debugging, doing so would honor the caller's logging level of the
throwable and allow admins to maintain full control over the logs.
For example, using some built-in mechanisms from
http://logback.qos.ch/manual/filters.html#evalutatorFilter, we could add
something like this to the appender(s):
```
<filter class="ch.qos.logback.core.filter.EvaluatorFilter">
<evaluator>
<expression>java.lang.Exception.class.isInstance(throwable)</expression>
</evaluator>
<onMatch>DENY</onMatch>
</filter>
```
Thanks,
Brian
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