Add custom message to the plugins page of WordPress

Thanks to @rilwis. get_current_screen() returns a page object, from which I can check its id, which I imagine is unique!

function dont_update_plugins() {
    $screen = get_current_screen(); 
    if($screen->id == "plugins"):?>
        <div class="updated">
            <h3><?php _e( 'Please do not update plugins!', 'my-text-domain' ); ?></h3>
        </div>
    <?php endif; 
}
add_action( 'admin_notices', 'dont_update_plugins' );