public SentinelFeignClientProperties copy() {
		try {
			ObjectMapper objectMapper = new ObjectMapper();
			String json = objectMapper.writeValueAsString(this);
			return objectMapper.readValue(json, this.getClass());
		}
		catch (JsonProcessingException ignored) {
		}
		return new SentinelFeignClientProperties();
	}
enable refresh circuit breaker rules from config center.
spring-cloud-alibaba-starters/spring-cloud-circuitbreaker-sentinel/src/main/java/com/alibaba/cloud/circuitbreaker/sentinel/feign/SentinelFeignClientProperties.java