Is there any feasibility or method to find out the sources for the particular property update?
Ex. I am having thing called "Thing1" with "Property1" (NUMBER). For "Property1" get value form "Service1" and "Service2". How i can find out these two services updating value for Property1?
There isn't a way to track that based on the property itself.
you would probably have to add an additional property 'last updated by' and have the service toggle that as well.
then you can log the values and the last updated by so you have that information side by side and you can see which service updated the value over time.