http://jira.hyperic.com/browse/HHQ-4469
To reproduce:
Upgrade vCenter plugin environment to 4.5.1 or do a fresh install
Add a new VM or remove one that's already imported in HQ inventory
New VM doesn't get auto-discovered and imported in HQ (waited 4 hours after adding a new vm)
Deleted VM doesn't get removed from HQ (waited 4 hours after deleting it from vSphere client)
Also ran a manual auto-discovery for vCenter but that doesn't help
Anonymous