List will populate list with elements that match sel.

NewNotifier creates a new Notifier which uses the provided client for performing hierarchy lookups.

KeySelector is used for discovering a single object based on namespace and name.

LabelsSelector is used for discovering a set of objects in a hierarchy based on labels.

Notifier can be attached to a controller and generate reconciles when objects inside of a resource hierarchy change.

Watcher is something watching for changes to a resource.

Selector finding objects within the resource hierarchy.