code: @Initializer(after = InitMilestone.EXTENSIONS_AUGMENTED, before = InitMilestone.JOB_LOADED)
      public static void runMigrator() throws Exception {
          new Migrator().migrate();
      }
docs: Launches migration after all extensions have been augmented as we need to ensure that the credentials plugin
  has been initialized.
  We need ensure that migrator will run after xstream aliases will be added.
  @see <a href="https://issues.jenkins-ci.org/browse/JENKINS-36446">JENKINS-36446</a>