* @return array|null ('lag': seconds or false on error, 'since': UNIX timestamp of BEGIN)
* @since 1.27
*/
- protected function getTransactionLagStatus() {
+ final protected function getTransactionLagStatus() {
return $this->trxLevel
? [ 'lag' => $this->trxReplicaLag, 'since' => $this->trxTimestamp() ]
: null;