Add geography and authentication to Metrics feature branch

[whereissean]

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name: Default
about: Suggest changes to MDS
title: Add geography and authentication to Metrics feature branch

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MDS Pull Request

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Explain pull request

Updates requested by @schnuerle for features-metrics. Add geography and authentication to Metrics feature branch.

Is this a breaking change

A breaking change would require consumers or implementors of the API to modify their code for it to continue to function (ex: renaming of a required field or the change in data type of an existing field). A non-breaking change would allow existing code to continue to function (ex: addition of an optional field or the creation of a new optional endpoint).

• Yes, breaking
• No, not breaking
• I'm not sure

Impacted Spec

Which spec(s) will this pull request impact?

• metrics

Additional context

Add any other context or screenshots about the feature request here.

[schnuerle]

Thanks @whereissean this looks great!

Still to do:

1. Add beta tag and link in section of main page
2. Figure out k-anonymity values
3. Add revised special groups language.

I can do 1 and 3 once merged to feature branch.