@Override
  public long sizeInBytes() {
    // header + blobId
    // expires time ms
    // op time ms
    return super.sizeInBytes() + blobId.sizeInBytes() + 2 * Long.BYTES;
  }
@return the time of the operation (in ms)
ambry-protocol/src/main/java/com/github/ambry/protocol/TtlUpdateRequest.java