apollo-core/src/main/java/com/ctrip/framework/apollo/core/utils/DeferredLogCache.java/DeferredLogCache/add
class DeferredLogCache:  private static void add(Logger logger, Level level, String message, Object[] objects,
      Throwable throwable) {
    Line logLine = new Line(level, message, objects, throwable, logger);
    LOG_CACHE.put(LOG_INDEX.incrementAndGet(), logLine);
  }