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As in during your program you want to know if the values set for a resource triggered an Update? Why?

To script other dependent resources (change values or remove then from stack, etc) - well, I can create dynamic resource, but I also want to avoid it.

There's no way to currently get this information back from the engine to your program. I'd suggest raising an issue at <https://github.com/pulumi/pulumi/issues> with more information, it might be that what your trying to do is better handled some other way.