I have the "-2" condition for MS Cluster disks which don't show a size.
This scenario is already covered by the volume size needing to be greater than 95, so this additional rule is unnecessary.
I don't want low physical or virtual memory reported with my "disk space" checks, hence those lines.
These volumes are already excluded with the "Volume Type" statement being "Fixed Disk", so this rule is also unnecessary.
What I'm unable to determine based on this thread is why you're receiving alerts at seemingly random timeframes. This should only occur when the trigger is reset, which is why I asked you to define a Trigger Reset action so you would be aware when/if the condition is no longer true. The only other things that would make any sense are the additional unnecessary rule statements confusing the trigger condition, an existing alert escalation setting in this alert or one similarly defined, or a similar alert configured in the basic alert manager.