boolean isRecentEntryQueueEnabled() {
    return recentEntryQueueEnabled;
  }
Gets the storage stats for all serviceIds and their containerIds as of now (the time when the API is called).
Storage stats is comprised of 3 values: 1. valid data size (logicalStorageUsage) 2. physical data size 3. number of blobs.
The following data are considered as valid data for this API:
1. PUT with no expiry and no corresponding DELETE
2. PUT expiring at t_exp but t_exp_ref < t_exp
3. PUT with corresponding DELETE at time t_delete but t_del_ref < t_delete
For this API, t_ref is specified by the given reference time.
For physical data size, all the records will be taken into consideration, including DELETED PUT, even DELETE record itself.
For number of blobs, it includes all different blob ids.
@param referenceTimeInMs the reference time in ms until which deletes and expiration are relevant
@return the storage stats of each container in the form of a nested {@link Map} of accountId to another map of containerId
to {@link ContainerStorageStats}.
ambry-store/src/main/java/com/github/ambry/store/BlobStoreStats.java