Change record status: 
Introduced in branch: 

During the development of the action module, the configuration entity moved from the action module to the system module. However, the configuration entity prefix was still action.action. As a result, if you uninstalled the action module and had the views module enabled, you would suddenly lose functionality on admin/people.

Consequently, the system module's configured action entity was renamed from action.action to system.action.

Contributed modules

For contributed modules, yml files that define actions should also use the naming pattern.

Module developers
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 updates done