The earliest recollection of this bug is traced back to PAN-OS 9.1.5 - July 29, 2024.
This bug is fixed in PAN-OS versions 9.1.5.
Fixed an issue where Panorama commits failed due to a process ( useridd ) running on high file descriptors as a large number firewalls connect to Panorama for User-ID redistribution.
For more information:
https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-5-addressed-issues