WordPress at a glance
filter is not described

dashboard_primary_link filter-hook . WP 2.5.0

Filters the primary link URL for the 'WordPress News' dashboard widget.

Usage

add_filter( 'dashboard_primary_link', 'filter_function_name_8134' );
function filter_function_name_8134( $link ){
	// filter...

	return $link;
}
$link(string)
The widget's primary link URL.

Where the hook is called

wp_dashboard_primary()
dashboard_primary_link
wp-admin/includes/dashboard.php 1288
'link' => apply_filters( 'dashboard_primary_link', __( 'https://wordpress.org/news/' ) ),

Where the hook is used (in WP core)

Does not used.