docs: reccomendation cross-region failover for Private DNS Resolver

[lvlindv]

Overview/Summary

Created reccomendation and kql query for Private dns resolver

Related Issues/Work Items

https://dev.azure.com/CSUSolEng/Accelerator%20-%20AI/_workitems/edit/38509/

As part of this pull request I have

• [x ] Read the Contribution Guide and ensured this PR is compliant with the guide
• [ x] Checked for duplicate Pull Requests
• [ x] Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
• [ x] Ensured my code/branch is up-to-date with the latest changes in the main branch
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• [ x] Performed testing and provided evidence (e.g. screenshot of output) for any changes associated to ARG queries
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Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

azure-resources/Network/dnsResolvers/recommendations.yaml:1

• The word 'reccomendation' is misspelled; it should be 'recommendation'.

- description: Configure AZs and/or cross-region failover for Private DNS Resolver

[ehaslett]

Unfortunately I do not believe there is anything to recommend. Private DNS Resolver cannot be manually configured to use (or not use) multiple AZs, it will automatically use multiple AZs when available.

For multi-region, there is no checkbox, or configuration toggle to enable for multi-region. Multi-region requires many configuration steps across different Azure resources that are context dependent on the customer environment. I am not confident a KQL query could be written to evaluate if those context dependent configuration steps have been done. Remediation guidance would equally challenging to write. Generally multi-region/DR approaches are covered by WAF guidance unless a resource has specific configurable multi-region options.

[oZakari]

LGTM

[ehaslett]

LGTM - thank you for working on this with the feedback we had!