The Palo Alto Networks security platform must have alarms enabled.

It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without a real-time alert, security personnel may be unaware of an impending failure of the audit capability, and system operation may be adversely affected. Alerts provide organizations with urgent messages. Real-time alerts provide these messages immediately (i.e., the time from event detection to alert occurs in seconds or less).

Go to Device >> Log Settings >> Alarms. If the "Enable Alarms" box is not checked, this is a finding.

Go to Device >> Log Settings >> Alarms. Select the "Edit" icon (the gear symbol in the upper-right corner of the pane). In the "Alarm Settings" window; select the "Enable Alarms" box. Select "OK". Commit changes by selecting "Commit" in the upper-right corner of the screen. Select "OK" when the confirmation dialog appears.