Issue #2654628 by gnuget, lokapujya: Deprecate PluginInterface

core/modules/views/src/Plugin/views/PluginInterface.php

@@ -4,6 +4,9 @@
 
 use Drupal\Component\Plugin\PluginInspectionInterface;
 
+/**
+ * @deprecated as of Drupal 8.3.x, will be removed in Drupal 9.0.0
+ */
 interface PluginInterface extends PluginInspectionInterface {
 
 }