/**
* Updates one or more stats counters by arbitrary amounts.
*
* @param string|array $stats The metric(s) to update. Should be either a string or array of metrics.
* @param int|1 $delta The amount to increment/decrement each metric by.
* @param float|1 $sampleRate the rate (0-1) for sampling.
* @return boolean
**/
public static function updateStats($stats, $delta=1, $sampleRate=1) {
if (!is_array($stats)) { $stats = array($stats); }
$data = array();
foreach($stats as $stat) {
$data[$stat] = "$delta|c";
}
StatsD::send($data, $sampleRate);
}