Alerts Guidance for Azure Function Apps/ ExpressRoute/ Storage

[cassiekays]

Overview/Summary

Replace this with a brief description of what this Pull Request fixes, changes, etc.

This PR fixes/adds/changes/removes

1. Replace me
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Breaking Changes

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As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Ensured PR tests are passing
• Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

[cassiekays]

@JoeyBarnes , ready for review :)

[judyer28]

@cassiekays the _index.md files for each section need to have the "geekdocHidden: true" removed. In your reference links, please remove the "/en-us" section of the URL so that the link will be translated to the language of the person browsing the link. Lastly, the metric names should be as they are defined in the metrics referenced here: https://learn.microsoft.com/azure/azure-monitor/reference/supported-metrics/microsoft-web-sites-metrics. For example, the name field can be "Data In" but the metricName should still be "BytesReceived." Please update so that the metric names match the reference docs.