You can monitor the number of integrations that subscribe to events, and their status, on the Subscriptions page in a project.

1. In the navigation pane, click Projects.
2. Click the project name or click Edit .
3. Click Observe.
4. Click Subscriptions.
   The Subscriptions page shows the active event subscriptions in the project.
5. Click Filter to filter by event subscription integrations or retained events (events published, but not yet received by the event subscription integrations).