diff -u b/core/lib/Drupal/Core/Database/Database.php b/core/lib/Drupal/Core/Database/Database.php
--- b/core/lib/Drupal/Core/Database/Database.php
+++ b/core/lib/Drupal/Core/Database/Database.php
@@ -274,6 +274,15 @@
   }
 
   /**
+   * Gets information on all the database connections.
+   *
+   * @return array|null
+   */
+  final public static function getAllConnectionInfo() {
+    return self::$databaseInfo;
+  }
+
+  /**
    * Sets database connection information.
    *
    * @param array $databases