@JsonAnySetter
  public void add(String accountId, Map<Short, ContainerStorageStats> allContainerStats) {
    storageStats.put(Short.valueOf(accountId), allContainerStats);
  }
Add account id and account level storage stats in this {@link AggregatedAccountStorageStats}.
@param accountId The account id in string
@param allContainerStats The account level (all containers in this account) stats.
ambry-api/src/main/java/com/github/ambry/server/storagestats/AggregatedAccountStorageStats.java