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Guessing these may have shown up with the Az CLI support... one hit in github on one of the messages.
<https://github.com/google/go-cloud/blob/2ae6e177616a04b94100982ad9f1197af3c41d71/blob/azureblob/azureblob.go#L271>

Yeh these aren't from us, it's gocloud which is just writing to stdout. I think we can change that with `log.SetOutput`

Cool. That would be great! Concerned that escaped stdout could impact our automation.

Issues been raised <https://github.com/pulumi/pulumi/issues/10996>
I expect it will be resolved for the next release