# The MongoDB\Driver\Monitoring\TopologyClosedEvent class

(mongodb >=1.13.0)

## 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).

## Class synopsis

final class MongoDB\Driver\Monitoring\TopologyClosedEvent {
/* Methods */
final public getTopologyId(): MongoDB\BSON\ObjectId
}

## Table of Contents

- MongoDB\Driver\Monitoring\TopologyClosedEvent::getTopologyId — Returns the topology ID

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