public NacosEndpointGroupBuilder registryFetchIntervalMillis(long registryFetchIntervalMillis) {
        checkArgument(registryFetchIntervalMillis > 0, "registryFetchIntervalMillis: %s (expected: > 0)",
                      registryFetchIntervalMillis);
        this.registryFetchIntervalMillis = registryFetchIntervalMillis;
        return this;
    }
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