Change record status: 
Project: 
Introduced in branch: 
6.0.x
Introduced in version: 
6.0.0
Description: 

The \Drupal\lightning_core\ComponentDiscovery class is an internal relic of the Lightning distribution and not used by any code that is currently supported. It's essentially dead code, and it should not be used. It's deprecated in Lightning Core 6, and will be removed in Lightning Core 7.