code: public String getLoggerLevel(String loggerName) throws Exception {
          Address addr = Address.root().add(SUBSYSTEM, LOGGING, LOGGER, loggerName);
          return getStringAttribute("level", addr);
      }
docs: Returns the level of the given logger.
  
  @param loggerName the name of the logger (this is also known as the category name)
  @return level of the logger
  @throws Exception if the log level could not be obtained (typically because the logger doesn't exist)