private boolean canRelyOnMetadataForUpdate(BlobInfo blobInfo) {
    return blobInfo.getBlobProperties().getCreationTimeInMs() > routerConfig.routerUpdateOpMetadataRelianceTimestampInMs;
  }
Check if ttl operation can rely on metadata blob to determine if all the chunks of the blob have been ttl updated.
Currently this behavior relies on the value of the config {@link RouterConfig#routerUpdateOpMetadataRelianceTimestampInMs}.
For more details please check the comments on the config.
@param blobInfo {@link BlobInfo} object.
@return {@code true} if ttl update has been optimized. {@code false} otherwise.
ambry-router/src/main/java/com/github/ambry/router/OperationController.java