You can try something like this:
- Create a scheduled campaign running at the interval you want to receive alerts
- Option 1
- Create a segment of users who've entered the Canvas or received messages during the reporting period
- In your reporting message template, use Connected Content to Braze's GET /segments/data_series to retrieve the size of the segment during the reporting period.
- Option 2
- In your reporting message template, use Connected Content to Braze's GET /canvas/data_summary to retrieve the number of entries during the reporting period.
- For either Option 1/2. If the size of the segment or number of entries is zero, send the alert. Otherwise abort the message.
Hope this helps, let me know if you have any questions.