Add more strict checking of hook_update_last_removed() and better explanation [#3098475] | Drupal.org
Thehigglers | Introduction to Drupal hook update
Troubleshooting database updates | Updating Drupal | Drupal Wiki guide on Drupal.org
The dependencies declared in core's hook_update_dependencies() implementations aren't actually correct [#717834] | Drupal.org
hook_update_N() and hook_update_dependecies() implementations done from a module could be taken as hook_post_update_NAME() implementations done from another module [#3236316] | Drupal.org
Improve documentation for post update hooks and update hooks to clarify distinction [#3087479] | Drupal.org
Drupal
Display output in terminal from hook_update_N. | Learn Drupal
Batch output in terminal when running hook_update confusing [#3431361] | Drupal.org