How to add env to all metrics?

[douglasg14b]

I can't see to figure this out, I want every metric emitted to include the application env without the emitter having to explicitly add it on every emit.

This include the http instrumentation.

I expect the env label to be added to all metrics exported in the PrometheusExporter, but they don't appear to be. if the env is added to the resource object

Where and how do I do this?

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Can we not do this at all because of: #5051 ?