Registers a new monitoring event subscriber

# MongoDB\Driver\Monitoring\addSubscriber

(mongodb >=1.3.0)

MongoDB\Driver\Monitoring\addSubscriber — Registers a new monitoring event subscriber

### 説明

MongoDB\Driver\Monitoring\addSubscriber ( MongoDB\Driver\Monitoring\Subscriber `$subscriber` ) : void

Registers a new monitoring event subscriber with the driver. Registered subscribers will be notified of monitoring events through specific methods.

> 注意: If the object is already registered, this function is a no-op.

### パラメータ

`subscriber` (MongoDB\Driver\Monitoring\Subscriber)

  A monitoring event subscriber object to register.

### 返り値

値を返しません。

### エラー / 例外

- 引数のパースに失敗した場合に MongoDB\Driver\Exception\InvalidArgumentException をスローします。

### 参考

- MongoDB\Driver\Monitoring\Subscriber
- MongoDB\Driver\Monitoring\CommandSubscriber
- MongoDB\Driver\Monitoring\removeSubscriber() - Unregisters an existing monitoring event subscriber
- Application Performance Monitoring (APM)