default CloudBlobMetadata getCloudBlobMetadata(BlobId blobId) throws CloudStorageException {
    return null;
  }
Query the blob metadata for the specified blobs.
@param blobIds list of blob Ids to query.
@return a {@link Map} of blobId strings to {@link CloudBlobMetadata}.  If metadata for a blob could not be found,
it will not be included in the returned map.
ambry-cloud/src/main/java/com/github/ambry/cloud/CloudDestination.java