apollo-core/src/main/java/com/ctrip/framework/apollo/core/utils/DeprecatedPropertyNotifyUtil.java/DeprecatedPropertyNotifyUtil/warn
class DeprecatedPropertyNotifyUtil:  public static void warn(String deprecatedProperty, String insteadProperty) {
    log.warn("[{}] is deprecated since 1.9.0 and will be removed in a future version, please use the [{}] instead.", deprecatedProperty, insteadProperty);
  }