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Besides creating abstractions for everything or adding tags to all resources which support them (which is not all of them) there probably isn't a simpler way to do it.

That said though, you can use a variable with the stack name and simply apply that tag to every resource you can and if you ever need to change that it'll be easy to do

The new `transformations` feature can help here: <https://www.pulumi.com/docs/intro/concepts/programming-model/#transformations>

I’m particular, you may want to use `pulumi.runtime.registerStackTransformation`. 