code: @Override
      public String[] getAvailabilityZones(String region) {
          return configInstance
                  .getStringProperty(
                          namespace + region + "." + CONFIG_AVAILABILITY_ZONE_PREFIX,
                          DEFAULT_ZONE).get().split(URL_SEPARATOR);
      }
docs: /*
  (non-Javadoc)
  
  @see com.netflix.discovery.EurekaClientConfig#getAvailabilityZones()