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https://issues.apache.org/jira/browse/SOLR-8324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15019070#comment-15019070
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Yonik Seeley commented on SOLR-8324:
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I guess it depends on how one views loggers.
Classes can be implementation details.  Different loggers (and logger 
configuration) are more interface than anything else.  Hence if one does a 
little code refactoring (an implementation change... say pulling something out 
into a private utility class), does it always make sense to change the logger?  
My gut says no.

But as I said in the email thread, the majority of the sharing cases may be due 
to laziness.

> Logger Untanglement
> -------------------
>
>                 Key: SOLR-8324
>                 URL: https://issues.apache.org/jira/browse/SOLR-8324
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Mike Drob
>             Fix For: Trunk
>
>
> I propose that we do a thorough examination of how we use loggers over the 
> whole project. There are many instances of loggers being shared between 
> classes that make troubleshooting difficult, and we can probably clean up 
> some of the usage that has accumulated over numerous code moves and 
> refactorings.
> Because this has the potential to scope wildly out of control, I would like 
> to break the work down into several subtasks.
> * Loggers should be declared all three of {{private static final}} when 
> possible. This both helps avoid the situations described in later bullets, 
> and might provide a very minor performance improvement.
> * Distinct classes should not use loggers from other classes, unless they are 
> explicitly delegated to do so.
> * Subclasses should declare their own loggers instead of relying on loggers 
> from parent classes.
> * Examine if forbidden-api or some other tool(s) can help maintain this, once 
> we reach a desired state.
> Each bullet might turn into one or more tasks, depending on how invasive 
> individual changes become.



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