Change record status: 
Project: 
Introduced in branch: 
9.3.x
Introduced in version: 
9.3.0
Description: 

The constant SCHEMA_UNINSTALLED has been deprecated, it has been replaced by Drupal\Core\Update\UpdateHookRegistry::SCHEMA_UNINSTALLED.

The following functions have been marked as deprecated in schema.inc and the corresponding Drupal Schema method should be used instead:

Drupal 8/9 Drupal 9.3+
drupal_get_schema_versions() \Drupal::service('update.update_hook_registry')->getAvailableUpdates()
drupal_get_installed_schema_version() \Drupal::service('update.update_hook_registry')->getInstalledVersion()
drupal_set_installed_schema_version() \Drupal::service('update.update_hook_registry')->setInstalledVersion()
Impacts: 
Module developers