I recently experienced an issue when I was connected to the Zimbra admin portal, in that the Server Status stats were not updating.
When I ran a zmcontrol status all of the services where showing as running.
su zimbra
zmcontrol status
To resolve this I restarted the logging service:
zmloggerctl restart
The stats run every two minutes, you can manually run them yourself with the following command:
/opt/zimbra/libexec/zmstatuslog
https://hazaq.me/zimbra/2018/02/02/Zimbra-Server-Status.html