This is a default one2many field form view. My need is to add a confirmation message for those buttons.

I have another doubt some one2many form view shows "save and Discard " button and some of the one2many fields shows "Save & Close" "Save & new"  and "Discard" in their default form view.

could you please explain what case one2many fields show "save" and "Discard" button

and what case one2many fields show "save&new", "Save&close" and "Discard" button in their default form view.