Aria Operations upgrade from version 8.18.6 to 8.18.7 is stuck at Stages 8 and 9 for more than 4 hours.
VMware Aria Operations 8.18.7
Stages 8 and 9 involve significant background OS updates and internal database migrations that can take several hours to reflect in the UI.
The service (CASA) needs a restart to correctly pick up the upgrade scripts:
service vmware-casa restart