Issue #2912803 by Jo Fitzgerald, heddn: MigrationPluginManagerInterface is...

Issue #2912803 by Jo Fitzgerald, heddn: MigrationPluginManagerInterface is missing createInstancesByTag

core/modules/migrate/src/Plugin/MigrationPluginManager.php

@@ -127,13 +127,7 @@ public function createInstances($migration_id, array $configuration = []) {
   }
 
   /**
-   * Create migrations given a tag.
-   *
-   * @param string $tag
-   *   A migration tag we want to filter by.
-   *
-   * @return array|\Drupal\migrate\Plugin\MigrationInterface[]
-   *   An array of migration objects with the given tag.
+   * {@inheritdoc}
    */
   public function createInstancesByTag($tag) {
     $migrations = array_filter($this->getDefinitions(), function ($migration) use ($tag) {

core/modules/migrate/src/Plugin/MigrationPluginManagerInterface.php

@@ -40,4 +40,15 @@ public function createInstances($id, array $configuration = []);
    */
   public function createStubMigration(array $definition);
 
+  /**
+   * Create migrations given a tag.
+   *
+   * @param string $tag
+   *   A migration tag we want to filter by.
+   *
+   * @return array|\Drupal\migrate\Plugin\MigrationInterface[]
+   *   An array of migration objects with the given tag.
+   */
+  public function createInstancesByTag($tag);
+
 }