I came across this:
Zmprov Examples - Zimbra :: Wiki
To enable logger on a single server:
zmprov +zimbraServiceEnabled logger
This just pulls up the zmprov command help, it doesn't enable the logger.
zmprov ms [FQDN] +zimbraServiceEnabled logger
Followed by
zmloggerctl start
Did appear to start the logger service. I will wait 48 hours and see if any data appears in the admin panel.