Github user vvysotskyi commented on the issue:
https://github.com/apache/drill/pull/930
I have implemented the proposal of @vrozov to conditionally enable Lilith
appender. I have used `ThresholdFilter` in Lilith appender, so it was not
needed to change all places where it is used.
An example of how to enable Lilith was added to the Jira description.
@jinfengni, @vrozov could you please take a look?---
