protected function init()
{
$this->categoryId = 'General_MultiSitesSummary';
$allMetricsInfo = API::getApiMetrics($enhanced = true);
$metadataMetrics = array();
$processedMetricsMetadata = array();
foreach ($allMetricsInfo as $metricName => $metricSettings) {
$metadataMetrics[$metricName] = Piwik::translate($metricSettings[API::METRIC_TRANSLATION_KEY]);
$processedMetricsMetadata[$metricSettings[API::METRIC_EVOLUTION_COL_NAME_KEY]] = Piwik::translate($metricSettings[API::METRIC_TRANSLATION_KEY]) . " " . Piwik::translate('MultiSites_Evolution');
}
$this->metrics = array_keys($metadataMetrics);
$this->processedMetrics = array_keys($processedMetricsMetadata);
}