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can we take diff of stack from history? eg: 1st run of activity vs 3rd run in activity etc?

If you're using the Pulumi Service as your backend stack state storage then there's a Stack Activity view apparently which might be what you're after. See <https://www.pulumi.com/docs/intro/pulumi-service/projects-and-stacks/#stack-activity>
 For the Azure backend, there used to be a `history` folder and/or a `backup` folder, but they seem to have stopped receiving any new entries some time at the end of 2020.  Instead there's just a single "_state_.json.bak" file next to the "_state._json" file in the `stacks` folder. I'm guessing this feature was removed to become part of the paid for service.
Now I've noticed this, I'm wondering if it might be a good idea to create a function with a blob or event grid trigger to copy the bak file into the history folder. Then I'd be able to do a diff file between the states.