(mongodb >=1.13.0)
MongoDB\Driver\Monitoring\SDAMSubscriber::serverChanged — Notification method for a server description change
$event): voidIf the subscriber is registered, this method is called when a server's description changes. For example, a server's type changing from secondary to primary would cause its server description to change.
event (MongoDB\Driver\Monitoring\ServerChangedEvent)An event object encapsulating information about the changed server description.
No value is returned.