Alerts from the vmware probe come from the vcenter and not the individual virtual machine host.
The default behavior for vmware probe 6.72 is to agregate self-monitoring alarms based on monitor type.
All alarms on will aggregate to one VCenter.
Release: UIM 8.x or newer
This can be reversed to the behavior of a previous vmware probe versiohn, (as seen in 6.60), using the configuration Setup key;
enable_self_monitoring_alarm_aggregation = false
Also with 6.72 by default self-monitoring alarm is sent only once when it occurs on a monitor type and it won’t sent again unless its cleared or the probe rebooted.
To reverse this and cause the probe to send a self-monitoring alarm every polling cycle, create the following Setup key:
enable_self_monitoring_alarm_same_error_suppression = false