Salesforce B2C Commerce reports on promotions via analytics reports, the debug logger, and system logs.
Because many implementations use pipelines to process promotions, the Pipeline Usage and Pipeline Errors reports can provide useful information when testing and troubleshooting promotions.
See Reports & Dashboards Technical dashboard. You can also use the Pipeline Debugger.
The Promotion Conversion dashboard tracks promotion conversions. See Reports & Dashboards Promotion Conversion dashboard.
The system logs capture information related to API processing, data staging, and error handling. These logs can provide useful information when troubleshooting promotion-related issues.