display-line-numbers

Provides a minor mode interface for `display-line-numbers'.

Toggle display of line numbers with M-x display-line-numbers-mode.
To enable line numbering in all buffers, use M-x
global-display-line-numbers-mode.  To change the default type of
line numbers displayed, customize display-line-numbers-type.

NOTE: Customization variables for `display-line-numbers' itself are
defined in cus-start.el.