code: public static Map<String, Level> getCustomLevels() {
  		Map<String, Level> levels = new HashMap<String, Level>();
  		for (Entry<String, String> entry : Configuration.getSiblings("level@").entrySet()) {
  			String packageOrClass = entry.getKey().substring("level@".length());
  			Level level = parse(entry.getValue(), null);
  			if (level != null) {
  				levels.put(packageOrClass, level);
  			}
  		}
  		return levels;
  	}
docs: Loads custom severity levels for packages or classes from configuration.
  
  @return All found custom severity levels