content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alibaba.nacos.api.naming;
  
  /**
   * Some keys of metadata that are recognized by Nacos
   *
   * @author nkorange
   * @since 1.0.0
   */
  public class PreservedMetadataKeys {
  
      /**
       * The key to indicate the registry source of service instance, such as Dubbo, SpringCloud, etc.
       */
      public static final String REGISTER_SOURCE = "preserved.register.source";
  
      public static final String HEART_BEAT_TIMEOUT = "preserved.heart.beat.timeout";
  
      public static final String IP_DELETE_TIMEOUT = "preserved.ip.delete.timeout";
  
      public static final String HEART_BEAT_INTERVAL = "preserved.heart.beat.interval";
  }
  