Change record status: 
Project: 
Introduced in branch: 
8.0.x
Introduced in version: 
8.0.0-BETA10
Description: 
Before
In a controller:
\Drupal::service('page_cache_kill_switch')->trigger();
After
In a route definition (in a *.routing.yml file):
some.route:
   path: '/some/path'
   defaults:
     _controller: '\Drupal\Some\Controller::response()'
   options:
     no_cache: TRUE
 
Impacts: 
Module developers