GitHub user paladox added a comment to the discussion: Help with migrating from 
log4j to log4j2 (we also use a slf4j -> log4j)

Well I want to configure all the loggers in root to x if name isn't specified. 
Although I guess it could be:

```
      LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
      ctx.getLoggerRegistry()
          .getLoggers()
          .forEach(
              logger -> {
                String loggerName = logger.getName();
                if (name == null || loggerName.contains(name)) {
                  Configurator.setLevel(loggerName, newLevel);
                }
              });
```

GitHub link: 
https://github.com/apache/logging-log4j2/discussions/3914#discussioncomment-14310895

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