You can use an address object of type IP Wildcard Mask only in a Security policy rule.
https://docs.paloaltonetworks.com/pan-os/9-0/pan-os-web-interface-help/objects/objects-addresses IP Wildcard Mask
-Enter an IP wildcard address in the format of an IPv4 address followed by a slash and a mask (which must begin with a zero); for example, 10.182.1.1/0.127.248.0. In the wildcard mask, a zero (0) bit indicates that the bit being compared must match the bit in the IP address that is covered by the 0. A one (1) bit in the mask is a wildcard bit, meaning the bit being compared need not match the bit in the IP address that is covered by the 1.
Convert the IP address and the wildcard mask to binary. To illustrate the matching: on binary snippet 0011, a wildcard mask of 1010 results in four matches (0001, 0011, 1001, and 1011).

The best-practice approach to logging traffic that traverses the firewall is to enable log at session end only.
This option allows the firewall to generate a log entry only when a session ends, which reduces the load on the firewall and the log storage. The log entry contains information such as the source and destination IP addresses, ports, zones, application, user, bytes, packets, and duration of the session. The log at session end option also provides more accurate information about the session, such as the final application and user, the total bytes and packets, and the session end reason1. To enable log at session end only, you need to:
* Create or modify a Security policy rule that matches the traffic that you want to log.
* Select the Actions tab in the policy rule and check the Log at Session End option.
* Commit the changes to the firewall or Panorama and the managed firewalls.
References: View and Manage Logs, Log at Session End, Certifications - Palo Alto Networks, [Palo Alto Networks Certified Network Security Administrator (PAN-OS 10.0)] or [Palo Alto Networks Certified Network Security Administrator (PAN-OS 10.0)].

References:

Explanation/Reference:
https://www.paloaltonetworks.com/cyberpedia/what-is-a-zero-trust-architecture