code: public String containerName() {
      final String shortId = job.getId().toShortString();
      final String escaped = CONTAINER_NAME_FORBIDDEN.matcher(shortId).replaceAll("_");
      final String random = Integer.toHexString(new SecureRandom().nextInt());
      return namespace + "-" + escaped + "_" + random;
    }
docs: Generate a random container name.
  
  @return The random container name.