apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/service/config/ConfigServiceWithCache.java/ConfigServiceWithCache/findActiveOne
class ConfigServiceWithCache:  @Override
  protected Release findActiveOne(long id, ApolloNotificationMessages clientMessages) {
    Tracer.logEvent(TRACER_EVENT_CACHE_GET_ID, String.valueOf(id));
    return configIdCache.getUnchecked(id).orElse(null);
  }