WordPress at a glance
action is not described

wp_delete_post_revision action-hook . WP 2.6.0

Fires once a post revision has been deleted.

Usage

add_action( 'wp_delete_post_revision', 'action_function_name_1617', 10, 2 );
function action_function_name_1617( $revision_id, $revision ){
	// action...
}
$revision_id(int)
Post revision ID.
$revision(object/array)
Post revision object or array.

Where the hook is called

wp_delete_post_revision()
wp-includes/revision.php 423
do_action( 'wp_delete_post_revision', $revision->ID, $revision );

Where the hook is used (in WP core)

Does not used.