WordPress at a glance
filter is not described

wp_update_attachment_metadata filter-hook . WP 2.1.0

Filters the updated attachment meta data.

Usage

add_filter( 'wp_update_attachment_metadata', 'filter_function_name_1905', 10, 2 );
function filter_function_name_1905( $data, $attachment_id ){
	// filter...

	return $data;
}
$data(array)
Array of updated attachment meta data.
$attachment_id(int)
Attachment post ID.

Where the hook is called

wp_update_attachment_metadata()
wp_update_attachment_metadata
wp-includes/post.php 5300
if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) )

Where the hook is used (in WP core)

Does not used.