Monitor an instance's changes

Hello,
all information that I need to monitor with a unit monitor is included in the properties of its target instance. The monitor must react to changes of the properties of its target instances (as they change during discoveries). Such as, if one of its properties
changes from 1 to 2, monitor should go critical, when the instance's property changes from 2 to 1, it should switch back to green.
Is it possible? To have a monitor receive both the current and "yet uncommitted future" state of an instance which it targets?
ondrej.

hello, thanks for your interest, but it seems I do not understand. I am kind of new into MP authoring. So would you please be able to be more specific?
My class instance and its parameters are discovered with a very resource expensive operation. It takes something like several-minutes-on-one-CPU-core-at-80% to populate the properties of the instance. I do that discovery with a script surely.
If I want to monitor the changes, I can definitely use some similar script for the "monitor" to plug data from the physical system again. The problem is, I just want to save some resources and do not want to run the script again.
The resulting value is already saved in the instance as one of its properties.
So isn't there a way, a monitor or something, that would be able to react/target directly the changes in a discovered instance?
I am just inexperienced in this. What I can do now, is to extract some monitor input values from its $Target, but these are only the current properties of the instance. I need to see even the previous values after its change.
I need to react NOT ONLY to a specific constant property value. I need to see the previous and current property states to determine how to react.
Is there a way how one can create a monitor/event/anything that would receive as parameters previous/future properties of some instance?
ondrej.

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Hello Markus.
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The DISP+WORK.exe still shows
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