What hook should I use to add post meta data with on update?

Use the hook ‘save_post’ that pass 1 arguments: $post_id. Update_post_meta won’t trigger save_post.

add_action('save_post', 'custom_add_meta', 10, 1);

function custom_add_meta($post_id){
    update_post_meta($post_id, 'meta_key', $value);
}

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