To view the PHP web server logs on a Palo
tail follow yes mp-log php.debug.log
To view the VPN logs on a Palo
tail follow yes mp-log ikemgr.log
See here. Show firewall logging rate
debug log-receiver statistics
Show Panorama logging rate. On Panorama, you can see this in the GUI using the Statistics link under Panorama > Managed Collectors.
debug log-collector log-collection-stats show incoming-logs