Comment 1 for bug 1937003

As noted in the configuration option description:
     "When set the charm will add tag to any newly created images. . Note that the charm will allways add the ``octavia-diskimage-retrofit`` tag to created images, this is for convenience and may be used by the charm for housekeeping in the future."

The ``octavia-diskimage-retrofit`` tag is added regardless of configuration, if you set the configuration option it will add what you configure in addition to the mentioned tag.

The act of adding the tag that Octavia looks for can have impact on Octavia's ability to create new load balancer instances depending on how existing image tags are maintained etc.

As such it is deliberately made into an operator choice to have the charm do it unconditionally.

There is room for further development and improvement of the whole amphora life cycle management story from the charms perspective, but that body of work would include more than changing the default of this configuration option.