Change record status: 
Project: 
Introduced in branch: 
8.x
Introduced in version: 
8.x-alpha4
Description: 

For better consistency, not only within Drupal itself but also with Symfony and Symfony CMF, Drupal 8 has adopted the following naming convention for routes in module.routing.yml files:

module_name.sub_name

For example:

aggregator.category_delete
Impacts: 
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: 
Other updates done