Thanks for the PR! The deprecation notices show in almost all the places, and --consumed needs to be deprecated as well (so please handle that too).

I checked what we do already to deprecate command line options; it seems that

• in the --help option: a message such as "Deprecated, this option will be removed from the future major releases. " is prepended (yes) to the "help" text
• in the man page: the text "Deprecated, this option will be removed in future major releases. " is prepended to the description of the option

So, as example how to apply them for the options here, I'll show what to do for the --available option:

• in the cli:

        self.parser.add_argument(
            "--available",
            action="store_true",
            help=_("deprecated, this option will be removed from the future major releases; "
                   "show those subscriptions which are available"),
        )

• in the man page:

  .TP
  .B --all
  Deprecated, this option will be removed in future major releases. 
  Lists all possible subscriptions that have been purchased, even if they don't match the architecture of the system. This is used with the
  .B --available
  option.

Since all the changes in the Python part will require reformatting, don't forget to use the black tool to reformat the code.

Let me know for more questions/doubts/etc.

LGTM, thanks!

Will wait for QE verification before merging.

LGTM from the QE POV and the pre-verification PASSED, therefore, PR can be merged:)