Show alert on admin dashboard wordpress

Snippet to show an alert on the dashboard of a wordpress site, but only on the main page

add_action('admin_notices', 'my_custom_admin_notice');

function my_custom_admin_notice() {
    global $pagenow;
    
    // Check if the user is on the main page of the admin panel
    if ($pagenow == 'index.php') {
        echo '

            
Your custom alert message goes here!
        
';
    }
}