WordPress at a glance
filter is not described

dashboard_secondary_items filter-hook . WP 4.4.0

Filters the number of secondary link items for the 'WordPress News' dashboard widget.

Usage

add_filter( 'dashboard_secondary_items', 'filter_function_name_9988' );
function filter_function_name_9988( $items ){
	// filter...

	return $items;
}
$items(string)
How many items to show in the secondary feed.

Where the hook is called

wp_dashboard_primary()
wp-admin/includes/dashboard.php 1348
'items'        => apply_filters( 'dashboard_secondary_items', 3 ),

Where the hook is used (in WP core)

Does not used.