jbonofre opened a new issue, #2147:
URL: https://github.com/apache/karaf/issues/2147
When using logback as logging backend with custom distribution, Karaf fails
to find the root logger.
```
karaf@root()> log:get
Logger │ Level
───────┼──────
```
And when issuing `log:set DEBUG` it creates duplicate entry in `logback.xml`:
```
<root level="WARN">
<appender-ref ref="FILE"/>
<appender-ref ref="OSGI"/>
</root>
<root level="DEBUG"/>
```
Also it doesn't support variable substitution e.g.
```
<logger name="test" level="${LOG_LEVEL:-WARN}"/>
```
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