[Spike] Preflight Checks API integration

[savannahostrowski]

Steps to repro:

1. Create a free account
2. Pick a template (I believe Mandy used a node template)
3. Choose East US 2 as region (apparently Central US region worked)

[Austinauth]

@savannahostrowski a few clarifying questions:

• Is the first step Create a free account something that the user has done prior to this error in the CLI?
• Is a free account the same as a regular Azure account you can create using the Azure web UI or is it something more specific/nuanced?

[savannahostrowski]

1. Yes + you'll need to auth with the free account
2. Free account with $200 credits link - https://azure.microsoft.com/en-us/free/

[savannahostrowski]

Moved this to November!

[savannahostrowski]

This is part of planned work we have for Gallium to improve error messaging.

[savannahostrowski]

Important for: Azure-Samples/azure-search-openai-demo#252

[rajeshkamal5050]

There is a Preflight API which is implemented across services/RP's. which does the following types of checks.

• Static validations
• Resource name check
• Quota check
• Capacity check
• SKUs
• Region availability

@ChrisHMSFT do you know the status and coverage of the preflight API's on the RP's?

[ChrisHMSFT]

Yes, all except the capacity check is supported today. You can use: https://learn.microsoft.com/en-us/rest/api/resources/deployments/validate?view=rest-resources-2021-04-01

[hemarina]

Preflight API has validation and deployment API. We already have deployment API. The enhancement is to add validation API to check failure before provision. The validation API is not working with all nested resources and our todo templates are using nested resources/module. However, adding validation API will help users validating their custom non-nested resources. There is a bug in azure-sdk-for-go preflight validate function: Azure/azure-sdk-for-go#23350 needs to resolve in order to add the enhancement to azd.

[rajeshkamal5050]

Based on comment here #4329 (comment) moving to backlog. Depends on fix from bicep/preflight team fixing nested resources handling. @hemarina can you add the corresponding dependency issue here for tracking?

[hemarina]

This issue will stay in backlog until preflight team release the fixes on nested resource: Azure/arm-template-whatif#157 (comment)