@Override
  public void onBlobUndeleted(String blobId, String serviceId, Account account, Container container) {
    logger.debug("onBlobUndeleted {}, serviceId {}, accountName {}, accountId {}, containerName {}, containerId {}",
        blobId, serviceId, account == null ? null : account.getName(), account == null ? null : account.getId(),
        container == null ? null : container.getName(), container == null ? null : container.getId());
  }
Logs all events at DEBUG level.
ambry-commons/src/main/java/com/github/ambry/commons/LoggingNotificationSystem.java