What parameters do I must go to get_tags to get ALL tags for the location, when utilized in a publish

I need to present all non-empty tags used on the location in a sidebar subsequent to the publish. Presently, inside a shortcode-triggered perform in capabilities.php I am calling…

$tags = get_tags( array(
    'orderby' => 'title',
    'order' => 'ASC',
    'get' => 'all'
) );

…nevertheless this nonetheless exhibits empty tags, just like setting 'hide_empty'=>false. If I do away with 'get'=>'all', then solely the tags utilized by the present publish are proven.

How do I present all non-empty tags, not simply those utilized by the present publish?