All classes that implement TrackerInterface in Search API 8
- class \Drupal\search_api\Plugin\search_api\tracker\Basic implements PluginFormInterface uses LoggerTrait, PluginFormTrait
- class \Drupal\search_api\Tracker\TrackerPluginBase implements TrackerInterface
- class \Drupal\search_api_test\Plugin\search_api\tracker\TestTracker implements PluginFormInterface uses PluginFormTrait, TestPluginTrait
- class \Drupal\search_api_test\Plugin\search_api\tracker\TestTrackerStringLabel
- class \Drupal\search_api_test_no_ui\Plugin\search_api\tracker\NoUi implements PluginFormInterface