The MongoDB\Driver\Monitoring\TopologyClosedEvent class
Introduction
The MongoDB\Driver\Monitoring\TopologyClosedEvent
class encapsulates information about a closed topology.
Note:
Due to the driver's
connection handling and persistence
behavior, this event can only be observed when a
MongoDB\Driver\Manager is created with the
"disableClientPersistence" driver option and freed
before request shutdown (RSHUTDOWN).