code: public Collection<String> getAllLoggerNames() {
  		Set<String> loggerNames = new TreeSet<>();
  		for (Logger logger : getParentLoggers()) {
  			loggerNames.add(logger.getName());
  		}
  		for (Logger logger : getLoggers()) {
  			loggerNames.add(logger.getName());
  		}
  		if (!customLoggers.isEmpty()) {
  			for (Entry<LoggerConfig, String> entry : customLoggers.entrySet()) {
  				loggerNames.add(entry.getKey().getName());
  			}
  		}
  		if (!customParentLoggers.isEmpty()) {
  			for (Entry<LoggerConfig, String> entry : customParentLoggers.entrySet()) {
  				loggerNames.add(entry.getKey().getName());
  			}
  		}
  		return loggerNames;
  	}
docs: returns all logger names including custom loggers
  
  @since 1.1.1
  @return