public NacosEndpointGroupBuilder registryFetchInterval(Duration registryFetchInterval) {
        requireNonNull(registryFetchInterval, "registryFetchInterval");
        return registryFetchIntervalMillis(registryFetchInterval.toMillis());
    }
Sets the interval between fetching registry requests.
If not set, {@value #DEFAULT_CHECK_INTERVAL_MILLIS} milliseconds is used by default.
nacos/src/main/java/com/linecorp/armeria/client/nacos/NacosEndpointGroupBuilder.java