apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/InstanceService.java/InstanceService/findInstanceConfig
class InstanceService:  public InstanceConfig findInstanceConfig(long instanceId, String configAppId, String
      configNamespaceName) {
    return instanceConfigRepository
        .findByInstanceIdAndConfigAppIdAndConfigNamespaceName(
            instanceId, configAppId, configNamespaceName);
  }