WordPress at a glance
action is not described

post_unstuck action-hook . WP 4.6.0

Fires once a post has been removed from the sticky list.

Usage

add_action( 'post_unstuck', 'action_function_name_8807' );
function action_function_name_8807( $post_id ){
	// action...
}
$post_id(int)
ID of the post that was unstuck.

Where the hook is called

unstick_post()
post_unstuck
wp-includes/post.php 2335
do_action( 'post_unstuck', $post_id );

Where the hook is used (in WP core)

Does not used.