You can use the Notifications functionality to be notified of any update failures.
Notification List
Notifications can be managed in the Content Sync backend. Notifications are managed per project. To manage the notifications, select the Project in the sidebar, open the settings and navigate to the Notifications tab:
Notification settings
The overview page provides a list of all Notifications you have configured. Each item shows the number of email addresses that are verified and/or pending verification. Use the Add button to setup a new notification or click on an item to edit the Notification settings:
Provide a name that makes it easy for the subscriber to understand what the notification is about. You can either receive a notification immediately on failure or aggregated for a specific time interval. You can add as many emails as you like; each new email will receive a verification email requesting the receiver to accept receiving notifications.
Limits
By default, notifications are limited to 30 per hour per project. If you exceed that limit, consider aggregating notifications instead.