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The idea is to not re-emit cpu samples from the cpu_pipeline by default, but instead simplify the pipeline.yaml by allowing these original samples to be emitted by the general-purpose pipeline as before, thus avoiding unintended double-publication. Now only the derived samples would be emitted from the scaling or rate of change transformers. Change-Id: I12623181d289fc0ee3cdb6fcdbacf8e76e53d244