WordPress at a glance
action is not described

updated_postmeta action-hook . WP 2.9.0

Fires immediately after updating a post's metadata.

Usage

add_action( 'updated_postmeta', 'action_function_name_1127', 10, 4 );
function action_function_name_1127( $meta_id, $object_id, $meta_key, $meta_value ){
	// action...
}
$meta_id(int)
ID of updated metadata entry.
$object_id(int)
Object ID.
$meta_key(string)
Meta key.
$meta_value(mixed)
Meta value.

Where the hook is called

update_metadata()
updated_postmeta
update_metadata_by_mid()
updated_postmeta
wp-includes/meta.php 284
do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value );
wp-includes/meta.php 721
do_action( 'updated_postmeta', $meta_id, $object_id, $meta_key, $meta_value );

Where the hook is used (in WP core)

Does not used.