plugins/ExampleTracker/ExampleTracker.php

<?php

/**
 * Matomo - free/libre analytics platform
 *
 * @link    https://matomo.org
 * @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 */

namespace Piwik\Plugins\ExampleTracker;

class ExampleTracker extends \Piwik\Plugin
{
    public function isTrackerPlugin()
    {
        return true;
    }
}