Which Console report details events while macOS is being used?

The system.log file, accessible through the Console application, contains a chronological stream of messages from the macOS kernel, system processes, and applications. It records events as they happen during normal operation, including startup sequences, application launches, background tasks, and system-level warnings or errors. This continuous logging makes it the primary report for detailing events while the operating system is actively being used, unlike other reports that are generated for specific failure conditions.

A. Crash Reports: These are generated only when an application or process terminates unexpectedly. They are not a continuous log of general system events.
B. Diagnostic Reports: These are comprehensive snapshots of system information, often generated manually or automatically for troubleshooting, not a real-time log of all events.
C. Spin Reports: These are created specifically when an application or process becomes unresponsive ("spins"). This is a specific failure state, not a general activity log.

1. Apple Support. (2023). View log messages in Console on Mac. Apple Inc. In the "View a log report" section, it explicitly lists /var/log/system.log as a key log report file available for viewing in Console, containing system messages.

2. Apple Developer Documentation. (2016). Logging. In the "Legacy APIs" section, it describes the Apple System Log (ASL) facility, which wrote messages to files like system.log. While macOS now uses a unified logging system, system.log remains for legacy compatibility and conceptually represents the system-wide event log.

3. Gordon, A., & Pessino, R. (2021). Apple Device Support: AppleCare Mac Technician (ACMT) 2021. Peachpit Press. Chapter 11, "macOS Troubleshooting," discusses using the Console app to view log files, identifying system.log as a source for system-wide messages that are useful for troubleshooting general issues. (Note: While this is a training guide, it is an officially sanctioned publication for the certification).