The most direct and intended method within the Adobe Experience Platform UI to monitor and be notified of ingestion issues is by creating alert rules. A data engineer can configure specific rules to trigger notifications for events like "Streaming end-to-end ingestion failure" or "Flow run failures." These alerts can be sent via email or to a webhook, providing immediate notification when an error occurs. This allows the engineer to promptly investigate the detailed error messages available in the dataflow monitoring dashboard to understand the root cause.

B. Partial ingestion is a data handling strategy to process valid records in a batch, not a monitoring capability to understand the cause of failures.

C. While Adobe I/O Events can be used for notifications, setting up alert rules in the UI is the more straightforward, built-in AEP capability for this specific purpose.

D. "System Events" is a generic term. "Alert Rules" is the specific, configurable feature in AEP designed to monitor and notify users about these events.

1. Adobe Experience Platform Documentation. (2023). Alerts overview. Adobe Experience League. Retrieved from https://experienceleague.adobe.com/docs/experience-platform/alerts/home.html. (This document introduces alerts as the primary mechanism for monitoring Platform operations.)

2. Adobe Experience Platform Documentation. (2023). Subscribe to alerts events. Adobe Experience League. Retrieved from https://experienceleague.adobe.com/docs/experience-platform/alerts/ui/subscribe.html. (See the table of "Available events," which lists "Streaming end-to-end ingestion failure" and "Flow run failed" as specific, monitorable events.)

3. Adobe Experience Platform Documentation. (2023). Monitor dataflows in the UI. Adobe Experience League. Retrieved from https://experienceleague.adobe.com/docs/experience-platform/sources/ui/monitor.html. (This page describes how to view detailed error diagnostics after being notified of a failure, which complements the function of alerts.)