The Log Forwarding feature in Palo Alto Networks firewalls allows administrators to perform automated actions based on logs. One of the actions that can be configured is to tag an IP address, which can then be used in conjunction with Dynamic Address Groups (DAG) to enforce security policies. By tagging the destination IP addresses of unwanted traffic, an administrator can dynamically update policies to block traffic to those destinations.
This method is particularly useful for responding quickly to detected threats by creating and enforcing a policy that blocks traffic to tagged destinations without the need for manual intervention or policy changes.
For a detailed explanation, the Palo Alto Networks' "PAN-OS Administrator's Guide" provides information on log forwarding and automated actions.

Regardless of whether you generate Forward Trust certificates from your Enterprise Root CA or use a self-signed certificate generated on the firewall, generate a separate subordinate Forward Trust CA certificate for each firewall. The flexibility of using separate subordinate CAs enables you to revoke one certificate when you decommission a device (or device pair) without affecting the rest of the deployment and reduces the impact in any situation in which you need to revoke a certificate. Separate Forward Trust CAs on each firewall also helps troubleshoot issues because the CA error message the user sees includes information about the firewall the traffic is traversing. If you use the same Forward Trust CA on every firewall, you lose the granularity of that information.
https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/decryption/configure-ssl-forward-proxy

Based on the provided table, the GlobalProtect portal agent configuration includes four gateways with varying priorities and response times. Users will connect to the gateway with the highest priority and, if multiple gateways share the same priority, the one with the lowest response time.
Answer Determination
Prioritize by Priority Level:
East: Highest
South: High
West: Medium
Central: Low
Evaluate Response Times Within Each Priority:
East (Highest): 35 ms
South (High): 30 ms
West (Medium): 50 ms
Central (Low): 20 ms
Given the highest priority is "East" with a response time of 35 ms, users will connect to the East gateway based on the highest priority.