Github user ellisonanne commented on the issue:
https://github.com/apache/incubator-pirk/pull/71
```
Levels used for identifying the severity of an event. Levels are organized
from most specific to least:
OFF (most specific, no logging)
FATAL (most specific, little data)
ERROR
WARN
INFO
DEBUG
TRACE (least specific, a lot of data)
ALL (least specific, all data)
Typically, configuring a level in a filter or on a logger will cause
logging events of that level and those that are more specific to pass through
the filter. A special level, ALL, is guaranteed to capture all levels when used
in logging configurations.
```
https://logging.apache.org/log4j/2.0/log4j-api/apidocs/org/apache/logging/log4j/Level.html
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