public function upgrade_alert( $alerts = array() ) {
		if ( ! $this->has_uncomplete_upgrades() || ! current_user_can( 'manage_options' ) ) {
			return $alerts;
		}

		// Enqueue admin JS for the batch processor.
		wp_enqueue_script( 'pum-admin-batch' );
		wp_enqueue_style( 'pum-admin-batch' );

		ob_start();
		$this->render_upgrade_notice();
		$this->render_form();
		$html = ob_get_clean();

		$alerts[] = array(
			'code'        => 'upgrades_required',
			'type'        => 'warning',
			'html'        => $html,
			'priority'    => 1000,
			'dismissible' => false,
			'global'      => true,
		);

		return $alerts;
	}