Registers a monitoring event subscriber globally

# MongoDB\Driver\Monitoring\addSubscriber

(mongodb >=1.3.0)

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

### 说明

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

Registers a monitoring event subscriber globally. The subscriber will be notified of all events in the extension for any Manager.

> 注意: If `subscriber` is already registered globally, this function is a no-op. If `subscriber` is also registered with one or more Managers, it will still only be notified once of each event for each Manager.

### 参数

`subscriber` (MongoDB\Driver\Monitoring\Subscriber)
  A monitoring event subscriber to register globally.

### 返回值

没有返回值。

### 错误／异常

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

### 参见

- MongoDB\Driver\Monitoring\removeSubscriber() - Unregisters a monitoring event subscriber globally
- MongoDB\Driver\Monitoring\Subscriber
- MongoDB\Driver\Monitoring\CommandSubscriber
- MongoDB\Driver\Manager::addSubscriber() - Registers a monitoring event subscriber with this Manager
- Application Performance Monitoring (APM)

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