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Why the metadata reuqest goes via a long way rather than given by Nova directly?

Dear folks,

I have a question about the metadata, maybe it's very straightforward for you to answer but it's stuck in my head.

While checking the flow of how an instance accesses the metadata by using http://169.254.169.254/..., it's quite a long path for the http packet to finally reach to the metadata agent then hand off to Nova, then I am wondering, since Nova is already the one who manages the instance, it knows well about the Instance ID, network ID, then why not we just let the Nova give the metadata directly to the instance?

Thank you and best regards qlzhang