/**
* @param array $config
* @param string $url
* @param string $unit
* @param string $valueKey
*
* @return string
*/
protected function fetchMetric($config, $url, $unit = '', $valueKey = 'average_value')
{
$beginDate = $this->getStringForTimeInterval($config['begin']);
$endDate = $this->getStringForTimeInterval('now');
$url = sprintf($url, $config['appId'], $beginDate, $endDate);
$data = $this->client->getJSON($url, $config);
$sum = 0;
foreach ($data['metric_data']['metrics'][0]['timeslices'] as $singleStat) {
$sum += $singleStat['values'][$valueKey];
}
$count = count($data['metric_data']['metrics'][0]['timeslices']);
$average = $count ? $sum / $count : 0;
return round($average, 2) . $unit;
}
