WordPress at a glance
action is not described

all_admin_notices action-hook . WP 3.1.0

Prints generic admin screen notices.

Usage

add_action( 'all_admin_notices', 'action_function_name_3787' );
function action_function_name_3787(){
	// action...
}

Where the hook is called

In file: /wp-admin/admin-header.php
all_admin_notices
wp-admin/admin-header.php 272
do_action( 'all_admin_notices' );

Where the hook is used (in WP core)

wp-includes/class-wp-locale.php 233
add_action( 'all_admin_notices', array( $this, 'rtl_src_admin_notice' ) );