Which of the following is not a function of the Classic Event Subsystem?

The Classic Event Subsystem primarily serves to manage and process events within the AVEVA Historian environment. While providing real-time notification of conditions is important, it is not the primary focus of this subsystem. The main functions typically revolve around the analysis and storage of event data rather than the active delivery of real-time alerts.

Storing historical events is a key role, as it allows users to access past event data for reporting and analysis. Handling event-triggered reports allows the system to generate reports based on specific occurrences or conditions that meet defined criteria. Moreover, generating alerts based on configured thresholds is integral to facilitating proactive responses to critical events or situations.

Thus, the aspect of providing real-time notifications, while valuable, is not confined to the Classic Event Subsystem's functionalities. Instead, it is generally handled by broader integrated systems within the overall architecture that may utilize the events managed by the subsystem, thereby making it the correct answer to the question.