public function getApproximateLagStatus()
{
if ($this->lagDetectionMethod === 'pt-heartbeat') {
// Disable caching since this is fast enough and we don't wan't
// to be *too* pessimistic by having both the cache TTL and the
// pt-heartbeat interval count as lag in getSessionLagStatus()
return parent::getApproximateLagStatus();
}
$key = wfGlobalCacheKey('mysql-lag', $this->getServer());
$approxLag = $this->srvCache->get($key);
if (!$approxLag) {
$approxLag = parent::getApproximateLagStatus();
$this->srvCache->set($key, $approxLag, 1);
}
return $approxLag;
}
