arm_admin_messages

This action hook is useful to display custom error, warning or success message on top of plugin pages in admin side.

Source: armember.php
Usage:
add_action( 'arm_admin_messages', 'your_function' );
function your_function($requested_page) {
    // Do Your Action.
    // print_r($requested_page); // Print current page slug.
}
Parameters:
$requested_page
current page slug