Add rate limiting for notifications

**Feature request**
It would be great to have export for types.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_export` with default `false`.

The title requests notification rate limiting, while the body requests export support and an enable_export configuration option; no files or tests are named. First clarify which feature is intended, then locate the configuration, notification, or export entry points and identify the expected behavior and tests before changing anything.

Written by the indexing model from the issue text.