Change record status: 
Project: 
Introduced in branch: 
8.0.x
Description: 

The configuration "staging" directory has been renamed to "sync" to not be confused with staging environments.

Existing Drupal 8 installation will use a fallback to the old "staging" name and so are not impacted directly. New sites will be installed with the new default.

Related changes

Constant CONFIG_STAGING_DIRECTORY was deprecated.
Use CONFIG_SYNC_DIRECTORY instead.

Core service config.storage.staging was deprecated and is now an alias.
Use config.storage.sync instead.

Internal API change:
\Drupal\Core\Config\FileStorageFactory::getStaging() is renamed to getSync(). No code should use this directly anyway -- instead, use the service above.

Impacts: 
Site builders, administrators, editors
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done