We should be able to monitor log forwarding health either through grep of the mp-logs or preferably by looking at the health on Panorama based on each managed devices serial number with the command:
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show logging-status device <firewall-serial-number> (on Panorama)
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View the average logging rate. The displayed rate will be the average logs/second for the last five minutes.If Log Collectors receive the logs, access the Panorama web interface, select Panorama > Managed Collectors and click the Statistics link in the far-right column.If a Panorama virtual appliance receives the logs, access the Panorama CLI and run the following command: debug log-collector log-collection-stats show incoming-logs