public int getHealthCheckTTL() {
        return getInt(HEALTH_CHECK_TTL_KEY, DEFAULT_HEALTH_CHECK_TTL);
    }
the properties of polaris registry

@author <a href=mailto:bner666@gmail.com>ZhangLibin</a>
registry/registry-polaris/src/main/java/com/alipay/sofa/rpc/registry/polaris/PolarisRegistryProperties.java