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

As of Symfony 2.2, the official Symfony docs use "path" rather than "pattern" to denote the URL of a route item. Drupal now follows suit. For example:

aggregator.feed_delete:
  path:  '/admin/config/services/aggregator/delete/feed/{aggregator_feed}'
   defaults:
     _entity_form: 'aggregator_feed.delete'
   requirements:
     _permission: 'administer news feeds'
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