Identify the command that allows debugging for common applications in real-time.

The command that allows debugging for common applications in real-time is "diagnose debug application." This command is specifically designed to enable detailed debugging of applications running on the firewall. When you use this command, it activates real-time monitoring of application behavior, allowing administrators to observe how the applications are functioning, identify issues, and assess performance on the fly.

Utilizing this command is particularly important for troubleshooting and ensuring optimal application performance. It provides granular insight into application-level operations, which is crucial when diagnosing problems that may not be visible through standard logging or monitoring commands.

The other options serve different purposes: "get system info" provides a snapshot of the system's status, "monitor application status" offers a general overview of currently running applications, and "log application events" focuses on historical log data rather than real-time debugging. Each of these can contribute to overall system management but does not directly provide the real-time debugging capabilities that the "diagnose debug application" command offers.