update_{$meta_type}_meta
Action Hook: Fires immediately before updating metadata of a specific type.
Source: wp-includes/meta.php:290
update_postmeta
Action Hook: Fires immediately before updating a post’s metadata.
Source: wp-includes/meta.php:304
updated_{$meta_type}_meta
Action Hook: Fires immediately after updating metadata of a specific type.
Source: wp-includes/meta.php:336