When collecting logs, the collector would hang at 12%, while the CPU on the ZVM is high (around 97% usage).
Upgrading to Zerto 3.5U7 and above will fix the issue.
Alternatively, these tweaks can be added instead (which will take effect after a reboot):
t_eventsMaximumCapacity = 200
t_ZvmEventDilutionIntervalInMs = 21600000