docs: public Map<String, String> getPropsWithPrefix(String confPrefix) {
      Map<String, String> configMap = new HashMap<>();
      for (Entry<String, String> entry : this) {
        String name = entry.getKey();
        if (name.startsWith(confPrefix)) {
          String value = this.get(name);
          name = name.substring(confPrefix.length());
          configMap.put(name, value);
        }
      }
      return configMap;
    }