Coordinator manages all notifier modules, making sure they are configured, started, and stopped at the appropriate time.

EmailNotifier is a module which can be used to send notifications of consumer group status via email messages.

HTTPNotifier is a module which can be used to send notifications of consumer group status via outbound HTTP calls to another server.

NullNotifier is a no-op notifier that can be used for testing purposes in place of a mock.

Module defines a means of sending out notifications of consumer group status (such as email), as well as regular expressions describing what groups to notify for.