Piwik\Plugins\ExampleSettingsPlugin\SystemSettings::createMetricSetting PHP Method

    private function createMetricSetting()
    {
        return $this->makeSetting('metric', $default = 'nb_visits', FieldConfig::TYPE_STRING, function (FieldConfig $field) {
            $field->title = 'Metric to display';
            $field->uiControl = FieldConfig::UI_CONTROL_SINGLE_SELECT;
            $field->availableValues = array('nb_visits' => 'Visits', 'nb_actions' => 'Actions', 'visitors' => 'Visitors');
            $field->description = 'Choose the metric that should be displayed in the browser tab';
        });
    }