When attempting to configure an alert on a specific object type (e.g. Virtual Machine), and limit this alert to only trigger on a specific object by using the Summary|Guest Operating System|Hostname property, the alert still triggers on all objects which breach one of the thresholds configured.
The alert has been configured to trigger when Any of the conditions are met as per image below:
Ensure that the configuration of the alert is logically consistent with what is required.
In this instance the alert should be configured to only trigger when All conditions of the alert are met to take into account the hostname condition and prevent this alert from triggering on all other objects of the same type.